trek top fuel 130mm fork

2022 Trek Top Fuel Review | All-new frame & geometry, with a whole new attitude

The not-so-minor details, 2022 trek top fuel 9.8 xt.

https://www.trekbikes.com/

- Brilliant trail-ripping geometry - Active and supportive suspension - Masses of cornering grip & stability - Refined and practical frame design - Downtube storage is a welcome addition

- Dropper post is sluggish - Wheels are solid but quite heavy - Carbon bars are harsh - Heavier than many of its competitors

Flow reviews the 2022 Trek Top Fuel

The Trek Top Fuel has long been known as the American brand’s flagship full suspension XC race bike, purpose-built to to compete at the very highest level of the sport. In more recent years however, the Top Fuel has steered in a different direction. With the short-travel Supercaliber taking over duties for World Cup XCO racing, Trek has softened the Top Fuel’s serious, race-focused persona, adding travel and bulking it up in the process.

For 2022, the Trek Top Fuel makes its biggest move away from its XC racing roots. Equipped with a brand new frame, an updated suspension design and some thoroughly modern geometry, the Top Fuel aims to retain the pert pedalling performance of its predecessor while significantly boosting its all-round capability. So, has Trek succeeded?

Watch our video review of the new Trek Top Fuel here:

Along with the active ABP suspension design and chunky tyres, there’s an exceptional amount of grip and support on offer for a 120mm travel bike.

Trek Top Fuel overview

Despite being all-new, the Trek Top Fuel retains its position in between the Supercaliber (the 60mm travel XC race bike) and the Fuel EX (the 130mm travel trail bike).

It’s equipped with a 120mm travel fork just like its predecessor, but rear travel has actually lifted by 5mm up to 120mm. This increase has been achieved with a longer stroke shock (50mm vs 45mm), and Trek has also flipped the orientation of the trunnion-mount. The rocker link now drives the shock via two sealed cartridge bearings to improve sensitivity.

You’ll no longer find a dual remote lockout on the Top Fuel, which leads to a vastly cleaner bike with fewer cables occupying your view from the cockpit. Along with the bigger shock, slacker geometry and 2.4in wide tyres, it is without doubt the most trail-oriented Top Fuel we’ve seen yet.

To put it into context, that sees it move away from the likes of the Orbea Oiz TR and the Canyon Lux Trail , and more towards the direction of the Santa Cruz Tallboy and Pivot Trail 429 .

A new, burlier chassis

Though it looks pretty similar, the Trek Top Fuel frame is all-new for 2022. It’s not so much a radical overhaul, but rather a collection of many small refinements that add up to a more practical package.

The chassis is notably beefier than its predecessor, with the seat tube diameter swelling to the new-school 34.9mm size. As well as increasing frame stiffness, the fatter seat tube is also shorter, allowing it to swallow a modern long-stroke dropper post.

The downtube is also larger, and it now features the integrated storage design we’ve seen employed on the latest Fuel EX and Slash. A latch underneath the bottle cage removes the trap door, providing you access within. A neat tool roll is included with the bike so you can carry a spare tube, levers and CO2. You could also fit a lightweight jacket in there along with some snacks.

Trek has updated the Knock Block headset, increasing the available turning radius from 58° to 72°. This provides you with greater freedom of movement on the trail, but still prevents the handlebar controls from smashing into the top tube. If you’re not into it though, the Knock Block is removable.

Also nice to see is a threaded bottom bracket shell for ease of maintenance, and the rear ABP pivot can now be tightened with a cassette tool. Also new for the Top Fuel is guided internal cable routing – poke the cable in at one end, and it’ll pop out the other, no fishing required.

Trail-leaning geometry

The 2022 Trek Top Fuel has received a series of geometry updates over the outgoing model, bringing it up to speed with other boundary-pushers in this travel bracket. Here are the key numbers;

• Head tube angle: 66°
• Seat tube angle: 76°
• Reach: 420mm (S), 450mm (M), 465mm (M/L), 480mm (L), 500mm (XL)
• Rear centre length: 435mm
• BB drop: 36mm

Compared to the old Top Fuel, the head angle has kicked back by 1.5-degrees and the reach measurements have gone up by 10mm. The seat tube angle has also steepened by 1-degree to improve the climbing position, while the chainstay length and BB drop remain the same.

The Top Fuel still features a Mino Link, but it’s now located at the lower shock eyelet. Bikes will come setup from the factory in the Low position. Flipping that into High will lift the BB height by 7mm and steepen the angles by 0.4°.

You can get even rowdier by fitting a 130mm travel fork, which will kick the head angle back to a very-slack 65.6° in the Low position. And for those wanting to push the needle further, there’s clearance to run 2.5in tyres.

Trek Top Fuel price & specs

We’ll see four Trek Top Fuel models coming into Australia this year – two with alloy frames and two with carbon. All Top Fuel models feature the same geometry, suspension design and travel. They’re all equipped with 29in wheels, and there are five frame sizes available from Small through to X-Large (the XS size with 27.5in wheels won’t be available in Australia).

Pricing kicks off at $3,499 AUD for the Top Fuel 5 and goes up to $8,299 AUD for the Top Fuel 9.8 XT that we have on test here. Additionally, Trek will offer a 9.9 spec via the Project One bike builder program.

You can check out the specs and prices for all those models down at the bottom of the page. Right now we’ll be diving straight into our experience of testing this bike here; the Top Fuel 9.8 XT.

• Frame | OCLV Mountain Carbon Fibre, ABP Suspension Design, 120mm Travel
• Fork | RockShox SID Select+, Charger 2 RL Damper, 44mm Offset, 120mm Travel
• Shock | RockShox Deluxe Ultimate RCT, 185x50mm
• Wheels | Bontrager Line Elite 30, OCLV Carbon Rims, 29mm Inner Width
• Tyres | Bontrager XR4 Team Issue 2.4in Front & Rear
• Drivetrain | Shimano XT 1×12 w/XT 30T Crankset & 10-51T Cassette
• Brakes | Shimano XT 4-Piston w/Ice Tech Rotors
• Bar | Bontrager Line Pro, OCLV Carbon, 27.5mm Rise, Width: 750mm (S), 780mm (M-XL)
• Stem | Bontrager Line Pro, 45mm Length
• Seatpost | Bontrager Line Elite Dropper, 34.9mm Diameter, Travel: 100mm (S), 150mm (M-M/L), 170mm (L), 200mm (XL)
• Saddle | Bontrager Arvada, Austentite Rails
• Confirmed Weight | 12.88kg (Large, Tubeless)
• RRP | $8,299 AUD

This differs from some other brands that utilise a single frame, and simply up-fork and up-shock it to create a slightly longer travel bike (like the Specialized Epic EVO and Orbea Oiz TR). The Top Fuel is not one of those bikes.

Trek Top Fuel sizing & fit

We put the new Trek Top Fuel into the hands of our tester Ben, who owns the current Top Fuel and has also spent considerable time on the Fuel EX. At 181cm tall, Ben’s been riding a size Large across all three bikes.

The Top Fuel is well-proportioned out of the box. The 480mm reach is very long, but it’s balanced nicely with a 50mm stem and the 76° seat tube angle. The Bontrager saddle is totally inoffensive, and we haven’t needed to shunt it into an extreme position just to get it comfortable.

The 760mm wide riser bars are a great match for this bike, and while it may not be totally necessary for all riders, the 170mm stroke dropper post is fashionably long for such a short travel bike.

Suspension & tyre setup

With the anodised sag gradients on the fork and shock, suspension setup is made easy. Weighing 80kg loaded up, Ben’s been running 180psi in the rear shock (26% sag) 80psi in the fork (20% sag).

The factory rebound tune for both the RockShox SID fork and Deluxe shock is quite light, so each rebound dial was set a couple of clicks slower than halfway.

Tubeless rim strips and valves come pre-fitted to the Bontrager wheels, and Trek kindly includes two bottles of sealant with the bike, making tubeless setup the breeze it should be. Pressures were set at 20psi on the front and 22psi on the rear.

Trek Top Fuel weight

Given its swollen proportions, the new Trek Top Fuel has gotten heavier. With the tyres setup tubeless, our test bike came in at 12.88kg without pedals. To put that number into perspective, here’s how it compares to some similarly-priced XC and Trail bikes we’ve recently tested;

• Canyon Lux Trail CF 9 – 11.22kg
• Merida Ninety-Six 8000 – 11.63kg
• Scott Spark 910 – 12.43kg
• Specialized Stumpjumper Pro – 12.84kg
• Trek Top Fuel 9.8 XT – 12.88kg
• Giant Trance Advamced Pro 29 1 – 13.38kg

Trek claims a carbon Top Fuel frame weighs 2.7kg including the rear shock, which puts it on the heavier side of things for a 120mm travel bike. The alloy frame is purportedly a whole kilo heavier again, with a claimed weight of 3.74kg.

The Top Fuel’s rolling stock is also a significant contributor to its overall mass. The Bontrager Line Elite wheels are heavy at 2,071g for the pair (with tubeless strips and valves). Incidentally, these are exactly the same wheels that came on the Slash 9.9 X01 , which is a full-bore enduro race bike.

Trek has also plumped up the rubber. The previous Top Fuel featured semi-slick XR3 tyres, but the new bike is now spec’d with 2.4in wide XR4 Team Issue tyres. They’re not overly heavy at around 800g each, though they do offer significantly better grip across a broader range of conditions.

What does the Trek Top Fuel do well?

From the very first ride the new Trek Top Fuel proved to be easy to get used to, with no quirks to the fit, handling or suspension.

The proportions are significantly broader compared to the outgoing Top Fuel, with the front wheel sticking out much further ahead of the rider. Despite the long reach however, the effective top tube length is basically identical to its predecessor, so the overall cockpit length remains the same.

The steeper seat angle is noticeable though, providing an improved climbing position with your hips placed further over the bottom bracket. As a result, less bum-shuffling is required on stem-chewing ascents.

Pedalling performance is also superb. Despite its burlier exterior, Trek is still prioritising pedal efficiency with the Top Fuel, with the main pivot positioned high and quite far forward of the bottom bracket. Anti-squat is claimed to hover around the 100% mark, and indeed the rear suspension clenches tightly under chain torque, propelling the whole bike forward with minimal energy loss.

Active suspension performance

Despite the trunnion bearing mount and the longer shock stroke, the rear suspension doesn’t feel radically plusher than its predecessor, which already offered great performance. It is noticeably more supportive though, particularly when absorbing square-edge hits at speed, and when returning to earth after boosting off a lip on the trail.

It’s worth noting here that many bikes in the 100-130mm travel bracket make use of a carbon flex-stay design, including the Canyon Lux Trail, Merida Ninety-Six, and Specialized Stumpjumper. As well as being simpler, flex-stay designs are typically lighter too.

In comparison, the Top Fuel sticks with a genuine four-bar platform based around the ABP suspension design. Trek claims the ABP pivot helps to isolate braking forces from the suspension, and indeed it does result in less skipping and skidding when you’re on the brakes on loose, rocky descents.

With all the pivot points rolling on steel ball bearings, the suspension is more active and possesses a more consistent feel to both compression and rebound damping when compared to a flex-stay design. Yes it’s heavier, but the Top Fuel offers notably more active suspension performance, with excellent traction on loose climbs and better reactivity across chattery rock gardens. It’s very impressive for a 120mm travel bike.

Look out Fuel EX!

The geometry is also brilliant, and the handling really sets it apart from the outgoing Top Fuel.

Cornering performance has improved, with more grip courtesy of the longer front end and those XR4 tyres. These are great all-rounders, with a supple casing and surprisingly decent rolling speed given their size and tread pattern.

The new Top Fuel is also much more composed on rough and fast descents. Thanks to the longer reach and slacker head angle, the overall wheelbase length has grown by almost 40mm. That’s huge, and it offers a vastly more planted feel at speed. Along with the big tyres and active suspension, this really is a solid little trail bike.

In fact, the geometry updates kind of make the Fuel EX look a little outdated. The two bikes now share the same head angle, and the Top Fuel has a 10mm longer reach and a steeper seat angle. The front end is quite a bit higher on the Fuel EX though, and that does inspire more confidence on really steep descents.

As mentioned earlier though, it’s possible to fit a 130mm fork to the Top Fuel, which would lift the front end and actually make it slacker than the Fuel EX. Indeed there’s now quite a bit of overlap between the two platforms, leaving us to ponder what could be in store for the next generation Fuel EX.

What does it struggle with?

You’ve likely gathered that the new Trek Top Fuel is more of a muscly trail ripper than a spindly XC featherweight. While it may carry over the name, it’s evolved into quite a different bike compared to its racier ancestors.

The lack of a remote lockout results in a much cleaner cockpit, and we like how it signals the Top Fuel’s commitment to its trail riding intentions. However, it may disappoint those riders and racers who prefer having an instantaneous sprint button at their fingertips.

Indeed with all the updates, and the fact that the new Top Fuel has double the travel of the Supercaliber, there is now an even bigger gap between these two bikes. Riders who are still interested in some part-time XC racing, but aren’t sold on the Supercaliber’s sharp geometry and proprietary IsoStrut suspension design, may be turned off by the Top Fuel’s new attitude.

Of course you could easily inject some speed with some lighter and faster-rolling tyres, like Bontrager’s XR2. There’s also around half a kilo to be saved in the wheelset, which would make a significant difference to the Top Fuel’s acceleration and climbing enthusiasm.

You could also flip the Mino Link into the High position to steepen the angles. In that guise, with lighter wheels and faster tyres, the Top Fuel would make for a comfortable and confidence-inspiring option for those wanting to sign up for the odd endurance race or multi-day event. If you’re serious about your XC racing though, this is not the bike for you – you’ll be wanting to look at the stupendously efficient Supercaliber for such endeavours.

Component highs & lows

The 2022 Trek Fuel 9.8 XT is a solid package out of the box, especially when you consider it comes in $1,600 cheaper than the 2021 model. And that’s with a pretty much identical build kit. How has a new bike gotten cheaper in the midst of a global pandemic and industry-wide component shortages? Heck knows!

There’s not a lot to be said about the Shimano XT groupset – it works, it’s solid, and it’s easy to tune. The I-Spec mounts offer plenty of adjustability for getting the brake and shift levers into the right spot, and the integrated dropper lever is a nice touch too.

The RockShox suspension isn’t quite as sensitive as the Fox equivalent, particularly the SID Select+ fork, which felt a little stickier than we expected. Otherwise the fork and shock perform well, and the ease of setup is great.

The Bontrager dropper post works fine, but the action is sluggish compared to some of its competitors. And while the carbon handlebars offer a nice profile, having spent a lot of time on OneUp handlebars lately, the Bontrager Line Pro feels considerably harsher in comparison.

We’ve had excellent long-term experience with Bontrager’s latest Line Pro & Line Elite carbon wheels , which feature thick carbon beads that are designed to increase impact strength while also reducing the chance of pinch-flats. They’re totally solid and come with an excellent crash-replacement guarantee, while the buzzy 108pt engagement freehub delivers rapid pickup at the pedals. As mentioned earlier though, they are heavy, providing an opportunity to drop significant weight with a wheel upgrade.

Otherwise we’ve been impressed with the frame finish so far. The Mino Link is simple and effective, the Knock Block is totally unnoticeable on the trail, and we’re big fans of the built-in storage from the Burrito Box. Or is it the Kebab Cave? Maybe a Sausage Roll Hole? Sushi Shaft? Cannoli Cavity? Hot Dog Hollow? Spring Roll Room?

Alright, alright! We’ll show ourselves the door…the door that leads into the Spring Roll Room – ha!

Flow’s Verdict

Tying together a whole suite of updates to the frame and suspension design, there are no doubts that the new Trek Top Fuel is a more capable bike than its predecessor. It’s still very efficient, but having adopted a more progressive approach to its geometry, it delivers a significant improvement in stability. Along with the active ABP suspension design and chunky tyres, there’s an exceptional amount of grip and support on offer for a 120mm travel bike.

With all those changes, the Top Fuel moves even further away from the Supercaliber. And for some riders, that gap will be a little too wide.

Trek seems happy to have a clear delineation between the two platforms though. This differs from some other brands that utilise a single frame, and simply up-fork and up-shock it to create a slightly longer travel bike (like the Specialized Epic EVO and Orbea Oiz TR). The Top Fuel is not one of those bikes.

Instead of being a long-legged Supercaliber, it’s really a shrunken-down Fuel EX, albeit one with more contemporary geometry. And having ridden both bikes, unless you really need the extra travel of the Fuel EX, this is arguably the better option.

Sure it may have put off the weight-weenies and lockout-lovers, but there’s no denying that the Top Fuel has broadened its appeal to an even wider range of riders, and we reckon it’s more fun as a result.

2022 Trek Top Fuel 9.9 XTR

• Fork | Fox 34 Step-Cast, Factory Series, FIT4 Damper, 44mm Offset, 120mm Travel
• Shock | Fox Float DPS, Factory Series, 185x50mm
• Wheels | Bontrager Line Pro 30, OCLV Carbon Rims, 29mm Inner Width
• Drivetrain | Shimano XTR 1×12 w/e*thirteen TRS Race Carbon 30T Crankset & 10-51T Cassette
• Brakes | Shimano XTR Race 2-Piston w/Ice Tech Rotors
• Bar | Bontrager RSL Integrated, OCLV Carbon, 27.5mm Rise, 820mm Width
• Stem | Bontrager RSL Integrated, OCLV Carbon, Length: 35mm (S), 45mm (M-XL)
• Saddle | Bontrager Arvada Pro, Carbon Rails
• RRP | $14,199 AUD

2022 Trek Top Fuel 9.7

• Fork | Fox Rhythm 34, GRIP Damper, 44mm Offset, 120mm Travel
• Shock | Fox Float DPS, Performance Series, 185x50mm
• Wheels | Bontrager Line Comp 30, Alloy Rims, 29mm Inner Width
• Drivetrain | Shimano SLX/XT 1×12 w/Deore 30T Crankset & 10-51T Cassette
• Brakes | Shimano SLX 4-Piston
• Bar | Bontrager Line, 27.5mm Rise, Width: 750mm (S), 780mm (M-XL)
• Stem | Bontrager Elite, 45mm Length
• Seatpost | TranzX Dropper, 34.9mm Diameter, Travel: 100mm (S), 150mm (M-M/L), 170mm (L), 200mm (XL)
• Saddle | Bontrager Arvada, Steel Rails
• RRP | $6,299 AUD

2022 Trek Top Fuel 8

• Frame | Alpha Platinum Alloy, ABP Suspension Design, 120mm Travel
• Fork | RockShox SID, Rush RL Damper, 44mm Offset, 120mm Travel
• Brakes | Shimano Deore 4-Piston
• RRP | $5,299 AUD

2022 Trek Top Fuel 5

• Fork | RockShox 35 Silver RL, Motion Control Damper, 44mm Offset, 120mm Travel
• Shock | X-Fusion Pro 2, 185x50mm
• Wheels | Bontrager Alloy Hubs & Alex MD35 Rims
• Drivetrain | Shimano Deore 1×12 w/Deore 30T Crankset & 10-51T Cassette
• Brakes | Shimano MT200 2-Piston
• Bar | Bontrager Comp, 15mm Rise, 750mm Width
• Stem | Bontrager Rhythm Comp, 50mm Length
• Seatpost | TranzX Dropper, 34.9mm Diameter, Travel: 100mm (S), 150mm (M-M/L), 170mm (L-XL)
• RRP | $3,499 AUD
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Tested: Trek Top Fuel

Don't call it a race bike. Trek's new Top Fuel is for railing steep fast decents with no course tape in sight.

Takeaway: Trek’s latest edition of the Top Fuel moves from being a big cross country racer and becomes a short travel trail bike. With new longer and slacker geometry, plus 5mm of extra travel, it aims to give riders the efficiency they want for long days while still enabling them to ride more technical trails with confidence.

• Fully guided internal routing in the front triangle plus a 73mm BSA threaded bottom bracket simplifies maintenance for both professional and home mechanics.
• The new Top Fuel has clearance for 2.5” tires; which makes perfect sense as even XC racers are now running 2.4” tires as standard.
• The downtube storage compartment is now featured on all Top Fuel models, including the alloy versions. It’s a great feature that often gets nixed on lower priced frame models.

Price: $11,500 Weight: 26.8lbs (size XL) Style: Full suspension 120mm trail bike Frame: OCLV Mountain Carbon, internal storage, tapered head tube, Knock Block 2.0, internal guided routing, downtube guard, magnesium rocker link, Mino Link, ABP, Boost148, 120mm travel Wheel Size: 29” Fork: RockShox SID Ultimate, DebonAir spring, Charger Race Day damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 120mm travel Rear Shock: RockShox Deluxe Ultimate RCT, 185mm x 50mm Drivetrain: SRAM Eagle AXS, wireless, 12-speed Cranks: SRAM XX1 Eagle, DUB, 55mm chainline, 175mm length Chainring: 30 tooth Cassette: SRAM Eagle XG-1299, 10-52T, 12-speed Brakes: SRAM G2 Ultimate hydraulic disc, carbon levers Front Wheel: Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle Rear Wheel: Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver, Boost148, 12mm thru-axle Tires: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29.x2.40'' Saddle: Bontrager Arvada, austenite rails, 138mm width Seatpost: RockShox Reverb AXS, 170mm travel, wireless, 34.9mm, 480mm length Handlebar / Stem: Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm handlebar rise, 820mm width, 0 degree stem rise, 45mm stem length

While XC race bikes were becoming longer travel, yet another new category of mountain bikes started to gain traction with riders: down-country. This new breed of bikes combines elements of longer travel all-mountain and trail bikes (such as slack geometry, more powerful brakes, and heavier casing tires) with shorter travel and lighter-weight frames. Essentially, burly XC bikes that you can ride all day, are efficient climbers, and very capable at descending. This is the approach Trek took with the latest Top Fuel.

The new Top Fuel strikes a similar silhouette to the older model, with a vertically mounted shock layout and Trek’s Active Braking Pivot suspension system; which now delivers an extra 5mm of travel in the rear to match the 120mm travel fork. The Top Fuel’s geometry is in line with other bikes in the emerging down-country category, with the headtube angle becoming 1.5 degrees slacker and reach increasing by 10mm as compared to the previous generation of the bike. The Top Fuel now also has clearance for 2.5 inch tires, for those who want to push traction to the limit.

The new Top Fuel edges ever closer into the territory of its longer travel sibling, the Fuel EX. The updated geometry of the Top Fuel actually makes the Fuel EX look a bit dated in comparison. The two bikes have identical headtube angles, with the Top Fuel having a longer reach and a steeper seat angle as well. You can even fit a 130mm fork on the Top Fuel, which would make it slacker than the Fuel Ex. Basically, the Top Fuel is no longer a race oriented bike. It has now morphed into an efficient trail bike for riders that still want solid pedaling performance to get up the climbs, but who want additional speed, confidence, and control on the descents.

Builds & Pricing

There are a total of nine different Top Fuel builds offered by Trek, plus carbon and alloy framesets. The Top Fuel is also available through Trek’s Project One program, allowing riders to customize everything from components to paint.

We got to test the Top Fuel 9.9 XX1 AXS build, which at $11,050 is (depending on your perspective) either a reasonable price for a modern high end bicycle or completely bonkers. With bikes such as Specialized S-Works Epic EVO coming in at a cool $13,000, and the Scott Spark 900 Ultimate EVO AXS at $14,000, the Top Fuel 9.9 almost seems price conscious.

The cheapest Top Fuel model, the alloy framed Top Fuel 5, features a RockShox Recon fork, X-Fusion X-Pro2 shock, and a Shimano Deore drivetrain at $2,630. The Top Fuel 7 has a Recon Gold fork with a mix of Shimano SLX and XT parts, plus Bontrager Line Comp wheels for $3,530. The Top Fuel 8 is the priciest alloy build at $3,830, with a RockShox SID fork and Deluxe Ultimate shock plus more powerful Shimano M6120 four-piston brakes.

The Top Fuel 9.7 is the most affordable of the carbon builds at $4,230. It uses Fox Rhythm 34 fork with a Float DPS shock and is finished with a mix of Shimano SLX and XT, plus Bontrager Line wheels. The Top Fuel 9.8 has three different versions based on your component preferences. You can go mechanical with SRAM GX or Shimano XT for $7,050 or upgrade to GX AXS for $7,550. All three use RockShox SID Select+ forks and Deluxe Ultimate RCT shocks, along with Bontrager Line Elite 30 wheels. Moving to the top of the price range, for $9,550Trek offers the Top Fuel 9.9 XTR build for Shimano and Fox lovers. It uses Fox Factory level suspension, a full mechanical XTR drivetrain, and Bontrager Line Pro 30 wheels. Riders preferring Rockshox Ultimate level suspension and electronic XX1 AXS shifting will need to spend $11,050 to get the most expensive Top Fuel model, the 9.9 XX1 AXS.

If you’d rather build your bike from the frame up, Trek offers alloy and carbon framesets. The Top Fuel AL frame sells for $2,320 with a Fox Float DPS shock. The carbon frame is priced at $3,720 and includes a Fox Factory Float DPS shock.

Geometry & Fit

The new Top Fuel has received the slacker and longer treatment, and as a result, the head tube angle is now a degree and a half slacker at 66º across the entire size range. Reach grows by 10mm while BB height and chainstay length remain the same from the previous generation.

Trek offers seven different sizes of the Top Fuel, including an M/L option for riders often caught between the medium and the large. With a stock stem length of 45mm on all sizes except an XS, our 6’3 tester felt cramped on the size XL and likely would have benefited from sizing up to an XXL. The issue was resolved with a longer stem, but the most expensive 9.9 builds of the Top Fuel Trek use its integrated Bontrager RSL handlebar and stem combo. It’s easy enough to swap out as it thankfully doesn’t run any lines internally, but it still means riders will need to supply both a bar and a stem to make fit adjustments. As always, it’s highly recommended that you get a test ride in at a shop before buying a new bike if possible.

Ride Impressions

The new Top Fuel is very much a short travel trail bike meant for ripping down burly trails. Thanks to a 40mm increase in wheelbase, a slacker head tube angle, and other geometry changes over its previous version, it feels much more planted and composed on rough and fast descents. It’s a bike that wants to hold a line and stay planted on the ground. This worked well in certain situations, like scrubbing speed on a rough bit of trail heading into a turn. Other times it made me have to fight the bike a bit to make quick line adjustments.

To highlight the new trail bike character of the Top Fuel, Trek has made some component choices to suit the bike's new intended purpose. Opting for four-piston SRAM G2 brakes, as well as grippier XR4 tires, for better control on steep descents. The frame is also beefed up with a larger downtube that now includes a storage compartment for snacks or, more likely, flat-fix tools. The seat tube also grows in diameter to increase stiffness and accommodate a larger diameter 34.9mm dropper post. The remote lockout is also gone from the handlebars – which, perhaps more than any other change, makes the Top Fuel's intent as a trail bike crystal clear.

Trek’s ABP suspension design has had many years of refinement and is a genuine four-bar platform, unlike many 120mm bikes that use a flex pivot. In contrast, all the pivot points on the Top Fuel use sealed bearings, resulting in a suspension setup that feels much more active. The design does a good job of isolating braking from the suspension, resulting in less skipping and bouncing when you’re hard on the brakes in a rough section of trail.

The downside of the Top Fuel’s trail bike transformation is that it’s now a bit heavy. Our premium 9.9 XX1 AXS XL sample came in at nearly 27 lbs. This isn’t wildly heavy for a trail bike, but typically you get a bit more suspension travel with that weight penalty. For reference, the Scott Spark I tested earlier this year has the same amount of suspension travel as the Top Fuel but is a full three pounds lighter. Trek does say that the Top Fuel is compatible with a 130mm fork, and I can’t help but think the new Top Fuel would have made a lot more sense with the increased travel straight from the factory.

After having multiple testers on the Top Fuel over the last few weeks, our consensus has been that the Top Fuel would thrive in a place that has a lot of machine built or well maintained, and steep trails. Trails where you can get the Top Fuel moving fast allow the progressive all-mountain geometry to shine and make the bike feel much more capable than its 120mm of travel would suggest.

The new Top Fuel is undoubtedly more capable than its previous version while maintaining much of its pedaling efficiency. Riders with more than a casual interest in racing should probably look at bikes such as the Scott Spark , Canyon Lux Trail , or Specialized Epic EVO . The Top Fuel is perhaps the ideal bike for riders who want a trail, or even all-mountain, bike geometry experience, but don't want the extra weight or need the extra bit of travel.

Trek Top Fuel 9.9 XX1 AXS

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2022 Trek Top Fuel

Wheel Size:

• XS: 27.5’’
• S–XXL: 29’’

Travel: 120 mm rear / 120 mm front

Material: Aluminum and Carbon versions available

• Aluminum frame w/ Fox DPS Performance shock : $2,300 USD / $2,900 CAD
• Carbon frame w/ Fox DPS Factory shock: $3,700 USD / $4,600 CAD
• Complete bikes $2,600 to $11,000 USD / $3,450 to $14,650 CAD; see below for details

When Trek first launched the Top Fuel in 2004, it was a dedicated XC race bike, and it stayed in that camp through several subsequent generations. In 2019, Trek nudged the Top Fuel a bit closer to the Trail category since the Supercaliber took over as their XC race full-suspension bike, but with just 115 mm of rear travel and XC-oriented geometry, that Top Fuel didn’t stray too far from its roots.

However, the all-new 2022 Top Fuel looks to add a big dose of Trail-bike capability, and features a bunch of interesting design details, too.

The overall layout of the Top Fuel hasn’t changed much from the prior iteration. It still uses Trek’s ABP suspension layout (a four-bar arrangement with a pivot concentric to the rear axle) with a vertically-oriented shock, and it’s still available in both aluminum and carbon versions. Both feature threaded bottom bracket shells, internal cable routing, and a storage port in the downtube. A water bottle does fit inside the front triangle on all sizes, but Trek says the XS is limited to a 15-oz one, and the Small can only accommodate a 20-oz bottle.

Both frame versions also feature Trek’s Knock Block 2.0 steering limiter, which has now increased the turning range to 72 degrees. Trek originally introduced the system to allow for a bigger downtube that would interfere with the fork crown if the bars got turned too far, but the new Top Fuel has no such limitation. Similar to the latest Trek Slash , the Knock Block system carries over on the Top Fuel to protect the cables from getting yanked on in a crash, but it can be removed if desired. There’s also ample rubber protection on the chainstay, seatstay, and downtube. A flip chip (Trek calls it a “Mino Link”) toggles between two geometry positions, which we’ll outline in more detail below.

Fit & Geometry

One of the most exciting details about the Top Fuel is that it’s offered in a whopping seven different frame sizes, ranging from XS through XXL, with a M/L snuck in the middle. This means that there’s both an especially wide range of sizes available, and that the jumps between sizes are a little tighter than average in the middle part of the range. And like we just saw from Rocky Mountain on their new Element — a bike that is squarely in competition with the new Top Fuel — the XS size Top Fuel gets 27.5’’ wheels, while the rest of the range rolls on 29’’ ones. That makes a lot of sense, for all the same reasons that we talked about in our First Look of the Element — shorter riders generally have less butt-to-tire clearance, and a shorter front wheel and fork makes it a lot easier for shorter folks to appropriately weight the front wheel, too.

The Top Fuel’s headtube angle sits at 66° in all sizes, and that’s paired with a 76° effective seat tube angle and 435 mm chainstays across the board. Reach ranges from a very short 400 mm to 520 mm across the size range. Interestingly, instead of doing neat 20 mm jumps between each size, Trek opted for a 30 mm jump between the Small to Medium, then tightened things to 15 mm between the Medium to M/L and the M/L to Large (the M/L frame’s reach clocks in at 465 mm). All those numbers are stated in the low position with the stock 120mm-travel fork; the high position steepens things by 0.4°, and Trek also condones running a 130mm-travel fork, which slackens both angles by 0.5°. For reference, here’s the full geometry chart:

There’s a huge range of geometry in modern ~120mm-travel bikes, from heavily XC-derived models to quite aggressive options (usually spec’d with a longer-travel fork), and the new Top Fuel sits somewhere in the middle of that range. Given how Trek has talked about the bike, that makes a lot of sense — this is supposed to be a bike for people who want a very sprightly, efficient bike with a solid dose of downhill capability for when things get rougher, and the Top Fuel slots in neatly there. It’s notably similar to the Transition Spur and Pivot Trail 429 , and just a touch less aggressive than the brand new Rocky Mountain Element and Guerrilla Gravity Trail Pistol — all strong contenders in this category.

Trek offers the Top Fuel in nine different builds, with prices ranging from $2,600 to $11,000, and there’s a great range of SRAM and Shimano options across a big spectrum of price points. And bonus points to Trek for sticking to Shimano on the least expensive few options — as we’ve discussed several times this past year , SRAM’s mid-to-high-end options work great, but Shimano has a clear advantage on the more budget-oriented end of the spectrum.

For reference, the complete build options are as follows:

• Fork: RockShox Recon Silver RL
• Shock: X-Fusion Pro 2
• Drivetrain: Shimano Deore
• Crankset: Shimano MT512
• Brakes: Shimano MT200
• Wheels: Bontrager Alloy
• Dropper Post: TransX
• Fork: RockShox Recon Gold 130 mm
• Shock: Fox DPS Performance
• Drivetrain: Shimano SLX shifter / XT derailleur / Deore cassette
• Crankset: Shimano Deore
• Brakes: Shimano MT4100
• Wheels: Bontrager Line Comp 30
• Fork: RockShox SID
• Shock: Fox Float DPS Performance
• Drivetrain: Shimano XT w/ SLX cassette
• Brakes: Shimano M6100
• Fork: Fox 34 Rhythm
• Drivetrain: Shimano XT w / SLX cassette
• Fork: RockShox SID Select+
• Shock: RockShox Deluxe Ultimate
• Drivetrain: Shimano XT
• Crankset: Shimano XT
• Brakes: Shimano XT 4-piston
• Wheels: Bontrager Line Elite 30 Carbon
• Dropper Post: Bontrager Line Elite
• Drivetrain: SRAM GX
• Crankset: SRAM GX
• Brakes: SRAM G2 RS
• Drivetrain: SRAM GX AXS
• Fork: Fox 34 Factory Step Cast
• Shock: Fox Float DPS Factory
• Drivetrain: Shimano XTR
• Crankset: e*Thirteen TRS Race
• Brakes: Shimano XTR 2-piston
• Wheels: Bontrager Line Pro 30 Carbon
• Fork: RockShox SID Ultimate
• Drivetrain: SRAM XX1 AXS
• Crankset: SRAM XX1
• Brakes: SRAM G2 Ultimate
• Dropper Post: RockShox Reverb AXS

Some Questions / Things We’re Curious About

(1) On paper, the Top Fuel looks like it’ll slot in somewhere between the most XC-derived 120mm-travel bikes and the most aggressive options in the class, but does that prove true on the trail?

(2) As shorter-travel Trail bikes get more and more capable, should more people who’d previously be shopping in a longer-travel category be looking at these sorts of options, including the Top Fuel?

Bottom Line (For Now)

Trek looks to have done a great job of modernizing their longstanding Top Fuel model, and in turn, bridging the gap between the Supercaliper XC race bike and the Fuel EX Trail offering. We’re hoping to get on one to see how it stacks up in a rapidly-growing field of contenders in that space, and will have a full review to come if we can make it happen.

2 comments on “2022 Trek Top Fuel”

Looks like a good all round option for up and down performance. I’d like to try it with a 130 mm fork in the high setting.

I have the 2022 Fuel EX7, I’m a xc type rider and do about one 50 mile ride per week on this bike. I went with the EX model because I like having the extra travel, however I wish I would have gotten the EX8 XT model and then just changed out the wheels and shifting for Sram GX 12 speed. The NX Sram has the DUB crankset and bottom bracket and there’s no thread together bottom bracket for this setup and the NX cassette is a boat anchor. So far I’ve put on lighter tires, seat post, and cassette and having a much lighter wheelset built for it now. I thought I would have been using the shock leavers but I just leave those full open 99% of the time these bikes handle great.

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Trek Top Fuel 8 review

• Alan Muldoon
• July 27, 2023

Once a lean XC race-focused machine, now a bulked up down-country rig. We test Trek's latest take on its short travel full suspension design.

Trek Top Fuel 8 Credit: Roo Fowler

Product Overview

Overall rating:, trek top fuel 8.

• • Poppy, playful and efficient
• • Available in six frame sizes
• • Internal down tube storage
• • Mino Link flip chip allows geometry tweaks
• • Needs a 180mm rear rotor
• • Accurate rear shock set up is crucial
• • A solid build, so not the lightest in its class

Manufacturer:

Price as reviewed:.

Think Top Fuel, and the image of a XC race bike instantly springs to mind. But like a faded polaroid tucked into the corner for a dusty picture frame, it’s not an accurate representation of the current design. With the Fuel EX increasing in travel, the Top Fuel has been swept along in its backdraft and seen in high definition, it’s now a capable 29er trail bike with modern sizing and 120mm travel and one of the best down-country bikes on sale. 

A dropper post and sorted cockpit complement the Top Fuel’s playful and poppy nature

Trek offers the new Top Fuel in carbon and alloy options, where the Top Fuel 8 tested here is the high-end alloy build. Regardless of frame material all Top Fuels come with integrated downtube storage. And while the quick release hatch under the bottle cage isn’t big enough to cram a three course lunch into the frame, there’s enough space for a tube, multi-tool, a few snacks and a lightweight jacket. 

Down tube storage is handy for those riders who are travelling light

Trek always offers a comprehensive size range; and with frame options from S to XXL, with a tweener M/L option too, the Top Fuel 8 is no exception. It also has geometry adjustment, but rather than having Trek’s signature Mino Link on the seat stay pivot, the Top Fuel has a flip chip at the lower shock mount. In the low setting this gives a relatively tall 340mm BB height for a 120mm bike, which is probably the only carryover from its race-bike roots – designed to let you keep the cranks spinning, and the speed high at all times.

• Best down-country mountain-bike: short travel full-suspension

The rest of the Top Fuel’s vital stats are on the money though, where a slack 65.6º head angle and steep 77.2º effective seat tube angle make it easy to hammer up the climbs and shred the descents. 

Flip chip in the lower shock mount offers 0.5deg head angle and 8mm BB height adjustment

It’s built solid too, the complete bike tipping the scales at 14.89kg. It also comes with a combined rider and bike weight limit of 136kg (300lb) so it’s clearly no wet noodle. Yes, it’s not the lightest for a 120mm bike, and not far off what you’d expect for a 150mm bike, but that’s the price you pay for integrated storage, as the alloy down tube needs reinforcing when you cut a hole in it.

Thankfully, the Top Fuel 8 rides light, as there’s less travel to pull through to get the bike off the ground, so it offers a different ride experience to modern long-travel trail bikes which tend to have one eye on enduro racing. 

The stock RockShox Pike Rush RC fork dishes out 130mm of travel

There are no sag gradients on the 130mm travel RockShox Pike fork, which we assume is down to cost saving, but set-up is still really straightforward with a tape measure to hand. And while the Pike has a reputation for having a sporty, firmer tune, the basic RC version on the Trek felt smooth and composed in all situations. Yes, the RC damper has a very wide range of rebound adjustment, but there’s only a small range that’s actually usable, but it is enough to get the rebound just so; and that’s all that really matters, right?

• Best mountain bike suspension forks: XC, trail and enduro forks

You need to be equally attentive when setting up the rear suspension. Set to 30% sag, the top-end RockShox Deluxe Ultimate RCT shock bottoms relatively easily. So if you want to run the shock softer to achieve a lower dynamic BB height, you’re going to need to add volume spacers. As such, we increased the shock pressure and reduced the sag to 27.5%.

This small change alone was enough to prevent premature bottom out, but we could still use all of the available shock stroke when we really needed it. We also ran the low-speed compression setting in the minus position for maximum plushness. In the low geometry setting we measured rear wheel travel at 115mm, which is 5mm less than claimed. 

One of the biggest differences in terms of ride feel between the Lapierre and the Trek, other than sizing, are the wheels. The Bontrager Line 30 rims have a 30mm internal rim width, 5mm more than the Mavic rims on the Lapierre XRM 6.9 we tested the Trek against. This adds to the overall volume of the tyres and the stiffness of the bike. It is also why we dropped the tyre pressures slightly on the Trek, even though we were running the exact same tyres on both bikes. 

Bolted on chainstay protection is a neat and considered touch

With 108 points of engagement the freehub on the Bontrager rear wheel offers rapid, secure engagement, with less chain slack and chain slap as a result. The bike is not totally silent though as there is a little bit of cable rattle, but it will probably disappear when you stuff the BITS storage box to the gills.

The contact points on the Top Fuel 8 are all sorted and while there’s a stack of stem height adjustment, the three 20mm spacers don’t offer any fine tuning of the handlebar height. So swapping one of the 20mm spacers of a 10mm, a 5mm and two 2.5mm spacers, would be our first move before leaving the store.

• How to: ultimate guide to handlebar cockpit set up

Nothing else needs changing though. The mix of Shimano XT and SLX for the 12-speed drivetrain worked flawlessly in the dry, dusty test conditions, where the smaller 30t chainring is a real saviour on long draggy climbs or on days when your legs feel like lead. 

ABP suspension design transforms the seat stay assembly into a floating brake mount

Performance

The steep seat tube angle on the Trek Top Fuel 8 really helps with the pedalling dynamics on steeper climbs and the cockpit is long enough that even with the shorter 45mm stem, you never feel cramped or uncomfortable when climbing. It’s not so steep though, that it feels like the pedals are behind you when sitting down spinning across flatter, rolling singletrack.

Stand up to sprint and the rear suspension on the Trek clearly gets animated, the rocker link flapping around like the tail on an overly excited puppy. So the best approach is to sit and spin up the climbs, as the shock remains remarkably still and lifeless until you encounter a bump. Also if you really want to go for it on smoother climbs, the rear shock has a firmer pedal threshold setting. In short then, gaining elevation on the Top Fuel 8 is relatively straightforward and painless.

Knock Block 2.0 steering lock with 72º steering angle, protects the frame without limiting steering

So, it’s somewhat surprising just how rapidly you can throw those gains away. This bike simply rips the descents. Given the limited travel it still seems to carry speed everywhere, and while bumps that would normally chip away at your momentum are still felt though the chassis, they do not perturb the Trek one bit. It rails corners too. Simply load up the suspension mid-turn, and the Top Fuel has just the right amount of support and extension to keep the front end loaded, before slingshotting you out of the turn faster than you entered it. Combine the raw speed with the balanced weight distribution, and the Top Fuel 8 is a really fun, exciting ride and blisteringly fast too.

Would the Trek Top Fuel 8 be even faster with a genuinely low geometry setting? You bet it would. But we’d settle for a bigger rotor on the SRAM DB8 rear brake, as this bike is so fast in fact, that the 160mm rotor feels wholly inadequate and it looked like it had been tempered after just a couple of rides. 

• Best cross-country XC mountain bikes: hardtail and full suspension

The Top Fuel 8 is at home on fast sweeping singletrack

At 14.89kg (32.83lb), the Trek Top Fuel 8 isn’t that much lighter than a 150mm bike. So if you want one bike to conquer all trails, it wouldn’t be our first choice. It’s still a great 29er trail bike though, and if bike park laps and enduro racing don’t fall under your trail bike remit, the Trek Top Fuel 8 offers a fast, fun and engaging ride. Its poppy playful nature, combined with generous sizing means you never feel limited by the travel for regular trail riding. Yet, it still feels more energetic and efficient under pedalling than than most 150mm bikes. It’s a heady combination that manages to keep both the tempo and fun factor high, without any apparent lows.

• The new Trek Top Fuel mixes uphill efficiency with downhill performance

by Andi Sykes October 8, 2021 15

The Trek Top Fuel was once considered the goto XC bike, but times have changed and the Top Fuel now blurs the line between XC and trail.

We know that you don’t like the term ‘Downcountry’ but it’s hard to ignore especially when Trek are so determined to use this new genre when describing the new Trek Top Fuel. With 120mm of travel front and rear, the Top Fuel certainly looks more XC than Trail, but with a sorted geometry, Trek is promising exceptional performance as gravity takes over.

Available in 7 sizes from XS to XXL and reach numbers increasing from 400mm to 520mm the new Top Fuel certainly starts as it means to go on. A size large bike gets an impressive 480mm reach combined with a 66-degree head angle and 76-degree seat tube angle, which sounds like a fun 120mm travel bike in our book.

Of course, geometry is only part of the equation, and Trek has spent significant time getting the kinematics just right too. The whole point of a downcountry bike (sorry) is that it climbs as well as an XC bike with efficient on trail manners, and that’s what Trek has ensured with the new Top Fuel

Want your Top Fuel to go downhill even faster? Well, Trek has included a flip-chip for geometry adjustments and the frame is compatible with a 130mm fork too.

Other frame features that make the new Top Fuel a worthy trail choice are the oversized 34.9mm seat tube which is compatible with long travel dropper posts, a 73mm threaded BB, and in-frame storage just like the Trek Slash. All models run on 29in wheels too, except for the XS size which has 27.5in wheels.

For more details visit the Trek website .

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Andi is a gadget guru and mountain biker who has lived and ridden bikes in China and Spain before settling down in the Peak District to become Singletrack's social media expert. He is definitely more big travel fun than XC sufferer but his bike collection does include some rare hardtails - He's a collector and curator as well as a rider. Theory and practice in perfect balance with his inner chi, or something. As well as living life based on what he last read in a fortune cookie Andi likes nothing better than riding big travel bikes.

Home › Forums › The new Trek Top Fuel mixes uphill efficiency with downhill performance

• This topic has 15 replies, 13 voices, and was last updated 2 years ago by lankysprinter .

What’s a for too?

“compatible with a 130mm for too.”

130mm fork, too?

From £2550 (or £2250 frame only) in case anyone was wondering…

Christ, you could buy a chameleon full build for that! 🤣🤣

“Downcountry….”

Marketing BS at it’s nauseating fing worst..

Seems exactly like the Fuel Ex was in 2018. My 2018 Fuel Ex 9.8 is lighter than the top fuel 9.8. 🙄 minimal changes, stupid prices. Welcome to the bike market, 2021.

I don’t give a shit what Trek wants to call it, it’s an xc/trail bike. Downcountry is just marketing bullshit.

Xc/trail were surely just marketing bullshit at one point too? 😆

The previous Trek Top Fuel (2020/2021) was capable of a 130mm fork, so Trek have been taking the Top Fuel that direction for a while.

The additional 10mm reach, 1.5 degree slacker HA and steeper seat tube I think completes the transition away from the Top Fuel previously being their ‘race bike’ – the S’Cal is that now.

I brought my 2020 Top Fuel wanting a fast XC bike that could handle some gnar – and I’ve been incredibly pleased with it. Not wanting to annoy the niche haters, but fitting out my Top Fuel in full #downcountry spec made it capable of keeping up with bigger bikes. A decent set of tyres and inserts meant that, like a hardtail, skill suddenly becomes the limiting factor.

I’m intrigued to ride the new TF, but they’re huge money now and I’m not sure I want to move so far away from the steeper angles I have on my 2020 model. Certainly, a shock tune, a set of 130mm forks with 35mm stanchions and decent tyres, and really, there isn’t much difference. Consider that the 2020 TF came with a 70mm stem – so any shorter stem will bring it in line with a 2022.

I would love the little compartment tho – although I have one on my Slash and I’ve still not worked out what to use it for.

Yea about 30 years ago.

Yea about 30 years ago

Ballocks. They were just mountain bikes 30 years ago.

I looked at these when i bought my Neuron. Great idea, craxy prices. Even comparing in house to a Fuel ex

It seems to be quite a lot like a 2015 remedy tbh

Ballocks. They were just mountain bikes 30 years ago

Errrr, Mountain biking was full marketing bullpigs back then.

They are a lot of ££ but it strikes me so is every similar bike? I’m torn between one of these and more trail hardtail. I can’t decide if one of these will make my local Marple/ peaks trails feel too easy?

I already have a Scott scale that’s fine but has non tubeless rims and rubbish suntour fork so could keep that for xc, gravel rides, marathons and have a new bike for local trails and longer marathons if needed.

Will I regret a full sus given I can’t jump, don’t ride trail centres more than once a year, etc?

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First Look: 2022 Trek Top Fuel - A Classic Reimagined

Cool Features

Trek Top Fuel Review

by Kyle Scott | Nov 12, 2021 | Bike , Mountain Bikes , Short Travel Mountain Bikes

Table Of Contents

Build options.

• The Bottom Line
• Price Comparison
• Climbing Ability 100% 100%
• Downhill Ability 70% 70%
• Overall Fun 70% 70%

Travel: 115mm rear/ 120mm fork

Head Tube Angle: 68

Seat Tube Angle: 75

Reach: 470mm (large frame)

Weight: 26.08 lbs

Price: $8,999.99

What We Like: Super lightweight

What We Don’t: Knock Block in headset

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• Climbing Ability 90% 90%
• Downhill Ability 90% 90%
• Overall Fun 90% 90%

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Head Tube Angle: 66.5

Seat Tube Angle: 76

Reach: 475mm (large frame)

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Reach: 473mm (large frame)

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App To Dial In Custom Suspension Settings

Slow on climbs.

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Reach: 454 (large frame)

The Top Fuel is a spirited machine that comes in a price bracket for all riders. It has 115mm of rear travel paired with a 120mm fork to keep trails comfortable while demolishing miles. With an effective seat tube angle of 75 degrees, it is more slack than some of the other bikes on the list, and with a head tube angle of 68, it is also slack enough to help on the downhills without sacrificing climbing ability.

The Trek Top Fuel is the only bike on the list that comes with a dual suspension lockout lever stock on the build. You are able to hit a lever on the handlebars that will firm up both suspensions, helping in the climbing and sprinting department. The same lever also works the dropper post, which is a bit slow in our opinion—but at least you won’t be needing a jockstrap while riding.

Trek also uses their patented Active Braking Pivot, which will keep your wheels on the ground when braking through choppy sections, keeping traction where it needs to be. The 115mm of travel keeps this bike super fast, but that can get you in trouble if you land in chunder. The Top Fuel does come with some larger tires, albeit with limited knob, but the 2.4s will keep traction and control as you get moving. The Fox 34 front fork is burly enough to handle a lot of what is thrown at it.

Where do we start? Trek is a large company, and they can produce a lot of options. It also helps that they have their in-house component company Bontrager. At the top of the component list are the wireless drivetrain options, especially the SRAM XX1 Eagle AXS drivetrain, and just about every component is either made of or brushed with carbon fiber for between $13,049.99 – $13,699.99. The Top Fuel 9.9 X01 is between $11,699.99-$12,349.99, and again it comes complete with high-end components and a lot of carbon fiber. From there, the Top Fuel comes in models ranging from $8,000 to the Top Fuel 7 SX with its aluminum frame that still comes with dual lockout and a dropper post for $3,499.99.

Trek also offers all three frame types for the Top Fuel for those looking to build their own set up. Carbon, $3.799.99 (on sale at time of writing for $2,879.99), Aluminum, $2,499.99, and Alloy for $2,349.99 are three options. This big company equals big options.

The Bottom L ine

With a 7 year warranty, you’ll be able to trust this bike until “modern geo” standards change again, and we’re all riding on bikes with 5-meter chainstays and 42-degree head tubes looking like Fred Flintstone on his way to work.

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Upgrading the fork on my Fuel from 120 to 140mm?

• Add to quote

Does anyone know what Trek's stance is on increasing the fork travel on a 2015 Fuel? I have a 2015 EX 9.8 in 27.5 with the Fox Performance 32 fork at 120mm travel. The bike itself minus the fork is incredible. I do ride some technical descents and the best description I can give is that the fork feels like it's starting to "freak out" a little bit when picking up speed on some of these downhills. I know I could sell my fuel and upgrade to a Remedy, but I honestly feel like a little beefier fork with a little more travel is all this bike needs and it would be absolutely perfect! I have an email into Trek and am waiting for a response, I don't want to do anything that would void my warranty. In the meantime, do any of you guys have an answer for this?  

Get a Remedy, seriously.  

Well first off travel is not the issue, it's stanchion diameter. You want a 34, Pike or even 36. Second, I agree with your assessment after owning a Fuel for the last year; the fork is far less capable than the rest of the bike... However, I upgraded to a Remedy for this year and it's well beyond the capability of the Fuel. I was doing some pretty big drops and jumps (maybe up to five or six foot drops) on the Fuel, but in hindsight the margin for error was pretty tiny. The Remedy feels much more confident overall. All that aside, I have ridden a Fuel with a 140mm fork and it was pretty awesome. Slacked it out a bit, but that actually felt pretty good. I know the higher end Fuels come with 130mm forks now as well. If you're set on the idea, I don't see anything wrong with it.  

Agree that the fork is crappy. The Performance line of Fox 32 forks should never be on a bike. They really give Fox a bad name. I loved my Fuel, except for the fork. It felt a little out of it's element anytime you pushed it ,and it was flexy. (I am 206 lb now). I did get a Remedy, and while I was going to keep the Fuel, the Remedy did everything better than the Fuel, so I saw no need to keep the Fuel. Now, I had an aluminum Fuel, and went to a Rem 9.8. You already have the Fuel 9.8, so you have the carbon frame, which is stiffer. I don't know if you would see improvements across the line with a Remedy as opposed to the Fuel like I did. Probably the best thing you could do, if you wanted to not have any warranty issues, is go with at least a Pike. I actually changed out the Pike on my Remedy for a Fox 36. Love that fork far more than the Pike. You actually have damping options on the 36. A fork with larger stanctions, and MUCH better damping, I think you'd be happy with the Fuel all day long, even with the 120mm travel.  

Only the EX 9 comes with the130mm fork, all the others are 120mm regardless of stanchion size. Coincidentally, I own the EX 9, and love it to bits. One of the main reasons I went to the 9 rather than the 8 I was looking at was the 34mm longer travel fork. You are correct, you need a beefier fork (bigger stanchions), as increasing the travel on the 32mm legs is only going to make it worse.  

Yeah, try Pike 120mm before going full Remedy. Thanx guys... Sent from my HTC6500LVW using Tapatalk  

140mm Pike, and your Fuel is set. You can always change it to 120mm down the road.  

Get the Remedy, or put a 34 or Pike at 130 mm on your Fuel. The rear ends of the Remedy and Fuel ride more differently than you'd guess for only 20 mm of travel, with the Remedy being significantly softer off the top of the travel and Fuel being a bit firmer and snappier feeling. Don't put a 140 on your Fuel and kill the magic. 130 with bigger stanchions will be an AMAZING change from the wispy 32 you're rocking now, in terms of both stiffness and damping quality. This will be debated by some, but I've ridden all three travels, and if I wanted a 140 mm fork, I'd vastly prefer the Remedy, since it's designed that way (probably why I own both). What is NOT debatable IMO is that a 140 mm fork with 32 mm stanchions will not only not improve things, but make them worse, because it will flex even more.  

kosmo said: What is NOT debatable IMO is that a 140 mm fork with 32 mm stanchions will not only not improve things, but make them worse, because it will flex even more. Click to expand...

Ridden a 2016 ex9 and now own a remedy 9.8 Happy I went with the remedy 9.8 that has a 36 up front, and also prefer the beefier/more travel/slacker remedy over the fuel ex The EX9 was a great bike no doubt, and that 34 blew me away. *coming from my superfly5 with a 100mm rockshox xc32, and ridden a mates ex5 that had a 120mm xc32 They feel like noodles in comparison even at 100-120mm. Granted, my mate has an older 26in wheeled remedy, with a 140mm 32. Doesn't really hinder him at all, he shreads it hard and does jumps drops rock gardens.. He did say he wishes it was a little sturdier, but he is pretty strict on money so wont bother until it breaks. I'd say try and get a demo on a remedy, or even a 2016 ex9 with the 130mm fox 34. Then you'd be able to tell if you want the difference in bike as a whole, or that the fork will do. And notice now Fox aren't making the 32 in anything more than 100mm travel, IIRC reading.  

Thanks guys, you've all given me a lot of great info to consider. Trek's response is that the frame wasn't designed to work with 140mm of front travel and it may cause excess stress and therefore would void my warranty. The 130 however is ok and it sounds like it would work great. I'm now in the position of trying to decide if I should go with a new fork or try to find a demo and spend some time on a Remedy. On another note, does anyone know if a 140mm Fox 34 can be reduced to 130? I'm having a hard time finding a Fox 34 with 130mm of travel out of the box.  

jgdblue said: On another note, does anyone know if a 140mm Fox 34 can be reduced to 130? I'm having a hard time finding a Fox 34 with 130mm of travel out of the box. Click to expand...

There's people who have 140mm forks on their fuels. In fact Trek supposedly tested them with such travel. While not recommended by Trek it should be fine. My question is what damper is in the 15 Fox Performance 32 fork. If it's the open bath then it's garbage. It starts packing up and "freaking out". So it might not be the flex issue but rather just the abysmal damper. Fox should allow you to upgrade the damper to a FIT and that could resolve your issue. It should be under $200 so that's the cheapest option too. But if you're close to 200 or over then flex is likely a concern too so a Fox34 would be a better upgrade.  

KidConejo said: There's people who have 140mm forks on their fuels. In fact Trek supposedly tested them with such travel. While not recommended by Trek it should be fine. My question is what damper is in the 15 Fox Performance 32 fork. If it's the open bath then it's garbage. It starts packing up and "freaking out". So it might not be the flex issue but rather just the abysmal damper. Fox should allow you to upgrade the damper to a FIT and that could resolve your issue. It should be under $200 so that's the cheapest option too. But if you're close to 200 or over then flex is likely a concern too so a Fox34 would be a better upgrade. Click to expand...

I have a 2015 Fuel 29er and I slapped a 2016 Pike RC3 140mm with 51mm offset on it, it rides amazing and definitely a huge upgrade from the Fox 32 120. Few things The slacked HA definitely makes (technical) descending much more enjoyable, and sometimes manageable, the bike doesn't "freak out" at higher speed like it did, or not as much. Longer travel definitely made a difference, since I was bottoming out the 120mm a few times per ride due to drops and higher speed. (Yes I have tuned my forks and had the appropriate amount of air and damping, the bottom out is due to riding the bike beyond its physical limit) Pike feels a lot more plush than the Fox 32, so the bike feels softer, sometimes I kind of miss the firmness in the middle of the travel from the Fox 32. The 35mm stanchions are much firmer than the 32, so huge upgrade here. The handling of the bike definitely changed, but I got used to it really fast and now it feels normal. I'm not a particularly strong climber, so I haven't noticed a big difference in the climbing ability of the bike. I'm sure it affected it a little (due to physics) but not enough for me to notice. I took my friends to a Trek demo event not long ago, one of the mechanics there did a triple take on my bike and confirmed with me that it was a Fuel with a longer pike. He told me he also owned a Fuel before and he did the same thing. I enjoyed riding my bike before the upgrade, and I enjoy it even more after the addition of Pike. However, my next bike will definitely be a bigger bike, in the realm of Remedy.  

Put my Pike at 140mm as well and never looked back. I prefer the shorter rear travel and longer in the front. I can echo the above comments: big downhill improvement, not very noticeable on the climbs, somehow. I actually appreciated the increase in stack height and ended up putting 50mm stem and 785mm bars on it to make it more downhill orientated. The net result is an astoundingly good all-rounder.  

I still have the stock stem (I'm guessing 70mm?) and stock handle bar (760mm) been thinking about going to a 20mm riser bar at 780 and 50mm stem since I mostly do descend... Been putting it off for some time now, was the difference as big as going 140mm or we talking about marginal improvement?  

Gotta disagree with the 140 idea. Certainly it will descend better in a straight line, but the slacker-than-designed HT angle, combined with the significantly higher BB, turns the bike into more than a bit of a barge in the twisty turny stuff, to the point that my Remedy is a snappier cornering machine than the Fuel with a 140 fork. Keep in mind that if you switch from a 32 to a Pike but stay at 120 travel, you're already lifting things up a bit. Going to a Pike at 140 will lift the front nearly 30 mm, if I recall the AC dimensions correctly. The good news is that if you choose the Pike, it isn't very difficult or very expensive to change travel by simply swapping out air shafts, so you can play around a bit with different travels without spending too much money, or having to send the fork off somewhere far away for two weeks.  

While I was concerned with this, it hasn't panned out in real world riding. It feels remarkably well balanced still and overall was an improvement with minimal loss in cornering (if any, I hadn't noticed as much as I was expecting). I'm 6', so the raised BB and AC wasn't even noticable on my 19.5". The slacker HTA was definitely a plus when combined with a more all mountain style cockpit. Just depends on your riding. I did all these upgrades over the winter with back to back riding between each step to make sure I could track any improvements or losses and it came together beautifully. First big trip out to Sedona and both climbing and descending was excellent. Yes, going 50mm and 785mm is a pretty significant difference. Not for everyone, but for me it felt great. A little tight in our local trees though! The #1 improvement, though, was putting a Monarch in the rear. It became butter! While not quite as stiff as the Fox climbing, technical climbs and descents were massively improved. Hands down the best upgrade yet.  

Thanks guys. If I do upgrade the fork it'll be a Fox 34 and I'll run it at 130mm to keep my warranty intact and follow the advice of the techs at Trek.  

Per Trek support. Fuel Tested and ran up to 140mm travel front Remedy tested and ran up to 160mm fork EWS riders run a fox 36 at 160mm  

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Top Fuel is a quick short-travel 29er trail bike that’s perfect for riders who like to stay pinned both up and down the trail. It’s lighter and snappier than a trail bike, but it’s a lot more forgiving on rowdy descents than a true cross-country bike. It’s the best of both worlds, and a hell of a lot of fun in the dirt.

MBUK's Trail Bike of the Year 2022

Top Fuel 8 earned high praise from MBUK for its updated geometry, a build that's up for anything, and suspension that feels deeper than the sum of its numbers when the trail gets rowdy.

Enduro’s Best Downcountry Bike of 2022

Top Fuel earned top honors in Enduro’s roundup of best downcountry rippers, thanks to the bike’s clean look, practical details, and progressive suspension.

Trail-eating geometry

10+mm more reach per size than previous Top Fuel for more confidence

66-degree headtube angle is 1.5 degrees slacker than previous models making it stable at high speeds and on descents

Mino Link lets you fine tune your frame geometry on the go. Keep it slack and low for confidence or flip it for quicker handling.

Rip down and rocket up any trail with Top Fuel’s capable and efficient suspension. 120mm of travel front and rear gives you enough squish to take bigger hits while a low leverage rate and high anti-squat ensure this bike jumps forward with every pedal stroke.

Optimized anti-squat = Snappy pedaling support

Top Fuel's efficient pedaling comes from a forward pivot on the seattube that provides optimal, near-constant anti-squat through the entire travel. So regardless of where you are in the travel, the bike accelerates when you push on the pedals.

Steeper seattube

A steeper seattube means you're pushing down on the pedals while also keeping front wheel weighted.

Knock Block 2.0

Removable Knock Block 2.0 still keeps cables from getting yanked out in a crash and protects the top tube, but now it provides 72 degrees of turning radius.

Mino Link lets you fine tune your frame geometry on the go. Stay in low for a slack 66 degree headtube angle. Flip it for a quicker 66.5 degree headtube angle and a 7mm higher bottom bracket for more ground clearance.

Additional MTB Options

If you’re gonna get just one mountain bike, make it this one. Fuel EX is fast on singletrack, capable in the rough, and fun wherever you ride it.

Supercaliber

Hardtail efficiency meets full suspension control in Supercaliber. This game-changing XC race bike is fast, light, and smooth in the rough.

• Rider Notes

2023 Trek Top Fuel 9.8 XT Gen 3

A 29″ carbon frame full suspension trail bike with high-end components. Compare the full range

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Top Fuel 9.8 XT Gen 3

In Stock: MD, MD/LG, LG, & XL

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155cm – 166cm

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Jul 2023 · Alan Muldoon

Think Top Fuel, and the image of a XC race bike instantly springs to mind. But like a faded polaroid tucked into the corner for a dusty picture frame, it’s not an accurate representation of the current design. With the Fuel EX increasing in travel, the Top Fuel has been swept along in its backdraft and seen in high definition, it’s now a capable 29er trail bike with modern sizing and 120mm travel.  Trek offers the new Top Fuel in carbon and alloy options, where the Top Fuel 8 tested here is the high-end alloy build. Regardless of frame material all Top Fuels come with integrated downtube storage. And while the quick release hatch under the bottle cage isn’t big enough to cram a three course lunch into the frame, there’s enough space for a tube, multi-tool, a few snacks and a lightweight jacket.  Frame Trek always offers a comprehensive size range; and with frame options from S to XXL, with a tweener M/L option too, the Top Fuel 8 is no exception. It also has geometry adjustment, but rather than having Trek’s signature Mino Link on the seat stay pivot, the Top Fuel has a flip chip at the lower shock mount. In the low setting this gives a relatively tall 340mm BB height for a 120mm bike, which is probably the only carryover from its race-bike roots – designed to let you keep the cranks spinning, and the speed high at all times. Best down-country mountain-bike: short travel full-suspension The rest of the Top Fuel’s vital stats are on the money though, where a slack 65.6º head angle and steep 77.2º effective seat tube angle make it easy to hammer up the climbs and shred the descents.  It’s built solid too, the complete bike tipping the scales at 14.89kg. It also comes with a combined rider and bike weight limit of 136kg (300lb) so it’s clearly no wet noodle. Yes, it’s not the lightest for a 120mm bike, and not far off what you’d expect for a 150mm bike, but that’s the price you pay for integrated storage, as the alloy down tube needs reinforcing when you cut a hole in it. Thankfully, the Top Fuel 8 rides light, as there’s less travel to pull through to get the bike off the ground, so it offers a different ride experience to modern long-travel trail bikes which tend to have one eye on enduro racing.  Suspension There are no sag gradients on the 130mm travel RockShox Pike fork, which we assume is down to cost saving, but set-up is still really straightforward with a tape measure to hand. And while the Pike has a reputation for having a sporty, firmer tune, the basic RC version on the Trek felt smooth and composed in all situations. Yes, the RC damper has a very wide range of rebound adjustment, but there’s only a small range that’s actually usable, but it is enough to get the rebound just so; and that’s all …Continue reading »

Poppy, playful and efficient. Available in six frame sizes. Internal down tube storage. Mino Link flip chip allows geometry tweaks.

Needs a 180mm rear rotor. Accurate rear shock set up is crucial. A solid build so not the lightest in its class.

Read Review

Mar 2022 · Peter Walker

In our big 2022 downcountry group test, we pitted the Trek Top Fuel 9.9 XX1 AXS against 5 of the hottest bikes of the year. Read the full review to find out what it’s capable of and how it stacks up against the competition. Hit the link for the full review and a list with all other bikes in test.

Freedom of movement downhill

Firm and efficient rear suspension generates plenty of traction

Intuitive handling

Practical detail solutions and clean look

Very wide handlebars

Mar 2022 · Guy Kesteven

Trek’s Top Fuel delivers superlative short-travel suspension performance but it’s definitely a trail bike not an XC bike

Infectiously agile and playful vibe

Superlative suspension feel

Seriously tight tracking frame

Trail tough kit

Internal storage

Too heavy for XC racing

Simple fork damper

Tight internal storage access

Yawning gap between this and the Supercaliber

Shore Country? Dad Country? No no, this one is "fast trail"

Dec 2021 · Henry Quinney

For a bike that is so capable on the descents, though, the Top Fuel still packs a mighty punch when it comes to gaining elevation..

Great suspension performance

Frame storage

Strong climbing performance

Knockblock isn't as well executed as other brand's versions

Works well when pushing hard, but might not be the most comfortable for all

Oct 2021 · Ryan "Squirrel" LaBar

Adding fire to the Fuel

The Trek Top Fuel has been overhauled for 2022, receiving an all-new frame with integrated storage, plus key updates to the suspension design and geometry. So how does it ride on the trail? And will everyone be pleased with all the changes? Read on for our Trek Top Fuel review.

Brilliant trail-ripping geometry

Active and supportive suspension

Masses of cornering grip & stability

Refined and practical frame design

Downtube storage is a welcome addition

Dropper post is sluggish

Wheels are solid but quite heavy

Carbon bars are harsh

Heavier than many of its competitors

My history of mountain biking started with a little wooden trike, with no pedals and wheels bigger than my head. I moved forward as any child does onto a bigger bike with bigger wheels and pedals. My parents always encouraged me to get outside and ride a bike, although I didn’t like the idea of mountain biking. I knew how to ride a bike; why go any further?

Last updated 10 July