trek top fuel 8

Trek Top Fuel 8 review: a progressive rather than podiuming XC machine

Trek’s top fuel delivers superlative short-travel suspension performance but it’s definitely a trail bike not an xc bike.

BikePerfect Verdict

Awesome suspension, agile swagger, grippy kit and practical frame updates build a brilliant rally bike, but high weight buries any XC aspirations

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

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Top Fuel used to be Trek’s out-and-out best full-suspension mountain bike for racing, but with the soft-tail Supercaliber under its sponsored riders now, the Top Fuel has developed a burly rather than race character.

The latest frame, suspension and spec changes to the 8 make the most of its short-travel agility and gripped tenacity to create a proper rally racer. Excess weight shows on climbs and acceleration though.

Design and geometry

The alloy Top Fuel frame not only has the same geometry, shock and suspension layout as its carbon counterpart but Trek’s engineers have also worked super-hard to give it the same extensive, updated feature lineup. That includes the lever-locked trapdoor into the down tube for internal storage, threaded bottom bracket shell with chain guide tabs. The Knock Block 2.0 inset now allows 72-degrees of steering lock (not 58-degrees as before) or you can fit a blank insert for full rotation if the bars aren’t slammed.

In fact, it’s one of those bikes where we continually found ourselves riding how we always want to ride, not how we actually ride. That inevitably builds into an addictive upward spiral of confidence and insolent speed that often ended with us snapping at the heels of more expensive longer travel bikes even on really rowdy trails. Picking a larger, longer frame will settle it even more at speed, but for flow trails, it was refreshing to really rip those big Bontrager side tire lugs round on a compact, close combat chassis. Just be careful you don’t get too carried away, as however good it feels, less travel inevitably means the tires are having to cope with more impact force and we soon put a couple of splits in the rear tire despite the ‘inner strength’ casing.

When that happens the narrow neck of the storage hatch can make getting your spare tube out awkward and the high cage position means you won’t get a large bottle in either. There’s space for a 2.5in tire in the rear swingarm which pivots co-axially around the rear axle according to Trek’s ‘Active Braking Pivot’ wisdom. While it limits choice, the switch to a 34.9mm seatpost size should mean stiffer, smoother dropper action, especially on larger frame sizes which get up to a 200mm shaft stock. The new trunnion style shock pivots more smoothly and is the right way up now compared to last year’s inverted shocks. That means the MinoLink geometry flip chip to change angles by 0.5-degrees is now at the base of the shock but it’s still easy to get too. Significantly all RockShox spec Trek bikes from the 8 upwards get the same ‘Ultimate RCT’ spec Deluxe rear shock.

The alloy frame is a kilo heavier (3.74kg vs 2.7kg) than the carbon option according to Trek’s weights. This saves you $1,400/£1,500 if you buy the frame separately, although it still retails for $2,319.99/£2,350. Those numbers prove it’s neither affordable or light for a bike that you’ll find listed in the XC section of Trek's website, not the trail pages. In fact, the 130mm Fuel EX Al frame is the same weight although that doesn't have internal storage.

A 66/66.4-degree head tube definitely suggests progressive riding rather than traditional podium hunting vibes too. The 465/469mm reach on our M/L size is more trad than rad though so riders after a stretch should make use of the short 450mm seat tube and opt for the L with a 480/484 reach. All bikes get the same 76/76.4-degree seat tube angle and 434/435mm chainstay length though so while having six (S-XXL) sizes is great, the balance is definitely centered around the M - M/L - L models.

Components and build

The Top Fuel 8 is the most expensive alloy bike, above the 7 at $3,529.99/£3,200 and the 5 at $2,629.99/£2,700 (we don’t know what 6 did to offend them but its missing from the line-up), but below the carbon-framed 9.7 at $4,229.99/£4,700.

The highlights of the package are the lightweight SID fork (albeit with the simplest Rush Damper) and Shimano XT rear mech and shifters. The Bontrager XR4 tires are some of our favorite welterweight all-rounders too. The SLX crank is a great piece with a 30T ring for easy climbing, but muscle Mary’s will find a 36T fits the frame too. You get a 150mm Trans-X dropper with a Bontrager Arvada saddle on top and 35mm diameter Bontrager Elite 45mm stem and 780mm wide bar.

Deore four-pot brakes just about do the job adequately via 180/160mm rotors but together with the wide rim tubeless Bontrager Line Comp 30 wheels they’re an obvious area where extra weight creeps in and adds up to nearly 14.5kg without pedals.

Performance

Add that weight to chunky treaded, relatively grippy tires and however Trek categorizes the Top Fuel, the 8 clearly isn’t the best choice for charging climbs and ripping round simple XC laps. Now we’ve got rid of the people who’ll likely love the 12.2kg Trek Supercaliber for the same money, we can start talking about what the Top Fuel does do really well – and that’s riding properly rowdy.

While bikes like the Evil Following , Santa Cruz Tallboy , and Norco Optic have already established that short-travel bikes can feel awesome, the Top Fuel definitely goes into the small travel, BIG capability hall of fame. Like most of its peers, it doesn’t squander initial shock movement and can feel slightly sharp in the car park unless you drop tire pressures low.

Once moving though it’s both amazingly fluid and connected over ruts and roots whether climbing janky tech or sucking onto stutter bump/root ripple turns or off-camber high lines. The wheel path and rear pivot position mean there’s minimal pull back through the pedals as it hoovers up chunder so you can stay on the gas without getting jacked or stalled out. While we’re always suspicious of acronyms and a 160mm rotor doesn’t generate much torque anyway, the braking performance of the ABP rear end is impressively grippy compared to the same hardware on other bikes.

Trek Top Fuel 8 with a RockShox SID fork

The RCT damper also has plus and minus low-speed compression settings to fine-tune support sensitivity depending on personal/terrain preferences. Even in the plus setting the mid-stroke mobility does mean you’ll want to flick into the much firmer ‘pedal’ mode if you’re stood up slow cadence churning on a climb or don’t want distracting bounce on long smooth climbs. The SID fork gets a similar firming option via the fork top lever though we rarely touched it unless we were really hanging on a road climb.

While the superlative suspension performance is definitely the heart of the Top Fuel’s ‘have a go hero’ character, the rest of the bike definitely exploits it rather than squandering it. The alloy frame might be heavy but it’s seriously stout when it comes to squaring up to the trail when things get punchy.

While the simpler Rush damper starts to get seasick and inconsistent well before the back end, the 35mm stanchions do a great job of staying on track. Shorter travel means less dive too and together with well-balanced cockpit dimensions and steering angle gives a really predictable and tenacious target lock.

Despite the hefty weight and relatively slow rear hub engagement the fact you can keep the power down or brake really late meant the Top Fuel always felt hyped to be hitting trails and tweaking lines as fast as possible. The shorter M/L size made it a proper joyride on tighter, twistier trails but you can still drive it really hard, heels down, feet level through turns and it loves to pump downslopes.

Trek’s Top Fuel 8 is a brilliant example of just how good short-travel suspension can feel, and less stroke always means a more responsive, visceral ride than a leggier bike. The geometry and proper trail tires really let you exploit the hooligan that’s hiding in the frame along with your pump, tool and spare tube too.

As much as we’ve loved ripping around the trails on it, there’s no doubt it’s heavier and harder to accelerate/elevate than we’d like for its supposed XC/downcountry range placement though. If you’re about the overall vibe, not outright velocity, that doesn’t matter though.

Test conditions

Temperature: -2 to 8 degrees
Surface: Mixed blue-black trail center, moorland tracks, off-piste wooded tech and DH

Tech Specs: Trek Top Fuel 8

Price: $3,829.99 / £3,850
Model: Trek Top Fuel 8
Discipline: XC/downcountry/trail
Head angle: 66/66.4-degrees
Frame material: Alpha Platinum Aluminium
Weight: 14.46kg
Wheel size: 29 x 2.4in
Suspension: RockShox SID 120mm travel, 44mm offset/RockShox Deluxe Ultimate RCT 120mm travel
Drivetrain: Shimano XT M8100 mech and shifter. Shimano SLX M7100, 10-51 cassette, chain
Cranks: Shimano XT 30T chainset
Brakes: Shimano Deore M6000 brakes with 180/160mm rotors
Cockpit: Bontrager Line 780mm bar and 45mm stem
Wheelset: Bontrager Line Comp 30 wheels
Tires: Bontrager XR4 Team Issue 29 x 2.4in tires
Seatpost: TranzX 150mm dropper post
Saddle: Bontrager Arvada, steel rail saddle

Guy has been working on Bike Perfect since we launched in 2019. Hatched in Yorkshire he's been hardened by riding round it in all weathers since he was a kid. He spent a few years working in bike shops and warehouses before starting writing and testing for bike mags in 1996. Since then he’s written several million words about several thousand test bikes and a ridiculous amount of riding gear. To make sure he rarely sleeps and to fund his custom tandem habit, he’s also penned a handful of bike-related books and talks to a GoPro for YouTube, too.

Current rides: Cervelo ZFS-5, Forbidden Druid V2, Specialized Chisel, custom Nicolai enduro tandem, Landescape/Swallow custom gravel tandem

Height: 180cm

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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.

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Trek Top Fuel 8 review

The Top Fuel's heritage may be cross-country, but this is a super-capable trail bike with a seriously addictive personality – so much so that it's our Trail Bike of the Year for 2022

Steve Behr / Our Media

Shrugs off limited travel figures on 95% of trails; loves to twist and turn; fast-rolling rubber helps keep speeds high

Fork can twang under heavier riders; you’re occasionally reminded of the 120mm travel

The Trek Top Fuel was updated at the back-end of 2021 and the result is a knock-out bike for all-round trail riding. So much so that, after pitting the Top Fuel against seven of its toughest competitors, it's our Trail Bike of the Year for 2022 .

The Top Fuel may be listed within Trek’s menu of cross-country bikes on the brand’s website but, with 120mm of travel at either end, it certainly has a whiff of ‘ downcountry ’ about it.

And, with a stout 35mm-chassis RockShox SID plugged in up front, tyres with more than a hint of tread and a 66-degree head angle, I wanted to see how far the new Top Fuel pushes into trail territory.

Trek Top Fuel 8 frame and suspension

The frame is constructed from Trek’s Alpha Platinum aluminium, with the main tubes manipulated in shape along their length.

Around the head tube, there’s a broad contact point between head, down and top tubes, while down by the threaded bottom bracket the down tube’s orientation changes to give a flatter, fatter surface for the BB shell to be welded onto.

The down tube houses a storage compartment, into which you’ll fit a multi-tool and tube, located under a door that also holds a bottle cage.

Trek admits that it adds weight, but claims it’s important to have in this category of bike. And, as the weight is relatively low, it adds stability by lowering the overall centre of gravity of bike and rider.

Trek’s contentious Knock Block steering-lock limiter allowed equipped bikes to have a straight down tube to enhance stiffness, and prevented damage from fork top caps on the down tube or low-slung brake levers on the top tube.

But some riders found the 58-degree angle irksome and disliked the compatibility issue caused by choosing to remove the device.

The 2022 Top Fuel features Knock Block 2.0, which has been redesigned to be less extreme and allow an increased steering angle from 58 to 72 degrees.

Top Fuel frames have been designed with more down-tube clearance for fork top caps, doing away with the previously straight, stiffness-promoting down tube found on Knock Block 1.0 bikes.

If both fork top caps clear the down tube and brake levers clear the top tube, Trek says it’s possible for riders to remove the Knock Block 2.0 completely with minimal fuss.

Wheel size is 29in except for the extra-small bike, which comes with 27.5in wheels (and in the 9.8 spec only). All complete bikes come with 2.4in-wide Bontrager tyres, but the frames will take up to a 2.5in, so mud clearance should be ample for UK riding.

Trek uses its APB suspension linkage to give the 120mm of travel. This features a pivot concentric to the rear axle, so is neither a true single-pivot nor four-bar linkage.

The vertically mounted shock is driven by a magnesium rocker link. It’s bulky, to add stiffness, but the use of magnesium saves weight.

The main pivot has been moved forward on the new bike, flattening the anti-squat curve and making it more consistent throughout its travel.

Trek Top Fuel 8 maintenance and durability

Trek hasn’t forgotten the mechanics out there, who will be happy to hear that although the Top Fuel has internally routed cables, Trek has fitted full-length internal sheathing throughout the bike, meaning no fishing around with bent spokes and magnets when it’s time to refresh the outer cables.

Interestingly, Trek has chosen to rid itself of press-fit bottom bracket issues for this bike and return to the venerable old 73mm-wide threaded shell.

While Trek hasn’t commented on the reason for this shift, many feel that the threaded BB is less prone to creaking, and it’s hard to argue with the ease of replacing a threaded BB when compared to its push-fit cousin.

The seat-tube diameter has expanded to the new 34.9mm standard, allowing the next generation of longer dropper posts to be fitted.

The reasoning behind yet another new standard is actually pretty sound. Its girthier chassis boosts stiffness and spreads side-loading more effectively, meaning modern, longer posts retain stiffness when extended, are stronger and experience reduced wear.

According to Trek, the related stiffness improvement in the frame itself (because of the larger-diameter tube and increased surface area at junctions) is “slight”.

Trek is also pleased to extol the burlier nature of the new Top Fuel, by extending warranty coverage to include the fitting of a longer 130mm-travel fork. Making such a move would slacken the head angle and seat tube angle by around 0.5 degrees and raise the bottom bracket by 3mm.

Trek Top Fuel 8 geometry

If you looked at the geometry figures in isolation of the suspension travel and website sub-menu, you’d be forgiven for thinking this was a totally modern 140mm trail bike.

The head angle is fairly slack at 66 degrees, while the seat angle is claimed to be 76 degrees. That’s not super-steep, but when your rear end sags less thanks to the reduced travel, its dynamic seat angle should still be pretty pert.

I also measured my test bike, with saddle 71cm above the bottom bracket, at 77.1 degrees – steeper than claimed.

The reach is impressively long at 480mm – a number I’d expect to see on some of the best enduro bikes . This combines with mid-length 435mm chainstays to give a wheelbase of 1,215mm.

The 450mm seat tube is short enough that longer-travel droppers should be within reach of most riders. The size-small bike has a 395mm seat-tube length, for reference.

These figures are for a size large (or 19.5in that Trek also gives) in its low setting. The numbers are similar for the small, medium, medium-large, large, XL and XXL – an impressive spread of sizes.

The Mino Link geometry chip is also provided, which steepens angles by 0.4 degrees, and adds 5mm to the reach. For the purpose of this review, I kept the bike largely in its lower setting.

Trek Top Fuel 8 specifications

Trek has gone to RockShox for the suspension on the Top Fuel 8, with its SID fork stood up front and a Deluxe Ultimate RC at the back. The shock has three main compression modes, from open to firm, as well as three settings in the open mode for even more fine-tuning.

The most open of these options gives a really light feel to the shock, while the most closed feels very close to the middle setting of the shock, with noticeably more compression damping.

Historically, the SID has been a pared-down XC race fork, and the SID SL still holds that baton.

The SID Select, though, is one of the new-generation burly XC/downcountry/light-trail forks that feature lighter-weight chassis, packing in extra stiffness thanks to 35mm (or 34mm in the case of the Fox 34) stanchions.

It maxes out with 120mm travel, and on this model Top Fuel we get the base-level fork that uses the OEM-only Rush RL damper.

With 120mm of travel, it feels stiffer than a 34, but perhaps not quite as stout as a Pike. The damper might be bottom-end, but it’s still smooth, and remarkably well controlled, with plenty of progression and little in the way of spiking.

Shimano is used for the drivetrain, with a mixed group of components. The 30t ring sits on a Deore crankset, an SLX chain tugs on a cassette from the same range, while the shifter and derailleur come from the XT family.

Four-piston non-series brakes from Shimano complete the package.

When it comes to wheels, tyres and finishing kit, Trek’s in-house Bontrager components feature heavily. This includes the Line 30 Comp wheels, shod in 2.4in-wide XR4 Team Issue tyres, and an alloy cockpit.

Trek Top Fuel 8 ride impressions

This bike was tested as part of our 2022 Trail Bike of the Year test. It was pitted against seven other bikes, with travel ranging from 120 to 140mm at the rear, and priced from £3,299 to £3,950.

The bikes were tested all over the UK, from long, steep tracks in South Wales to our regular testing loops in the Forest of Dean, fast rocky tracks in Scotland's Tweed Valley and the fresh-cut loam and rocky outcrops of the Cairngorm National Park.

Bikes were tested back to back, with short repeated loops ensuring differences were easily noticed. An extensive programme of workshop weighing, measuring and general poking about meant every little detail was explored.

I knew the Top Fuel was going to be a good ride from the minute I slung a leg over the 120mm-travel, alloy trail bike’s low-slung top tube. Its geometry felt right from the off, the spec list is up to the task and the suspension is all kit that I’m well versed in testing.

It’s easy to look at the bike from afar and assume this is just another downcountry rig, with its SID fork and short-travel figures. It wasn’t until I’d fired it over some jumps, nosed it down the odd steep chute and slung it through my test loops’ berms that I realised the Top Fuel is, simply put, a bloody brilliant trail bike.

Trek Top Fuel 8 climbing performance

Stab the lever that raises the unremarkable Trans-X dropper, chunk yourself precisely (thanks to Shimano’s excellent shifting even under power) into the biggest cog on the SLX cassette and the Top Fuel climbs like a sticky mountain goat.

The steep seat angle for a short-travel bike is helpful, positioning your hips further forward and centred over the bottom bracket, helping to keep the front wheel planted and pedalling efficient. When combined with the low 30x51t gearing, you can comfortably climb almost anything (traction permitting).

The Bontrager XR4s are a little slick for damp off-piste conditions, with a rounded profile and shallow tread blocks tending to skate over the surface rather than dig in. However, if conditions are dry, they happily transfer power through their mid-depth treads.

The trade-off is they roll fast and are communicative on the limit, letting go predictably. They provide acceptable grip on surfaced trails and leaf mulch, and don’t drag on tarmac.

The shock lockout lever on the Super Deluxe has an uncomfortable-to-operate indexed notch, which snaps open unpredictably, making it feel agricultural to use (especially with cold fingers). However, it does provide a severe but effective platform when climbing. In contrast, the SID Select fork lockout is a rather spongy affair.

Overall, the geometry and crisp Shimano shifting mean it’s easy to winch your way up to the top of a peak.

It does lack the taut eagerness of XC-derived downcountry rigs such as the Scott Spark , which strain at the leash to attack every climb, whereas the Top Fuel prefers to lope along comfortably.

As downcountry bikes go, the Top Fuel’s forward pivot position, placid anti-squat curve and overall build are swayed toward delivering incredible overall performance and stable, low-effort climbing rather than scintillating polka-dot-jersey-esque uphill sprints.

Furthermore, its 14.8kg weight separates it from the most dedicated downcountry bikes, which likely shed a kilo or two.

However, view it as a trail bike, and it knocks the socks off most traditional trail bikes when pointed up a hill.

Trek Top Fuel 8 descending performance

Point it downhill and the flickable chassis is easy to manoeuvre: if you’ve felt over-biked and sluggish on a 140mm trail bike, this is the answer.

Whereas some downcountry bikes are XC race rigs on steroids – devastatingly efficient on trail-centre loops, but unwieldy descenders – the Top Fuel feels as though Trek has tautened and lightened its Remedy trail bike.

Again, look at it as a trail bike, rather than a downcountry bike, and you’ll appreciate that its quality, not quantity, of suspension that often does the bulk of the work when it comes to descending, especially when backed up with really good geometry and decent kit.

While the Top Fuel lacks athletic fervour, it feels exuberant and cheeky, goading you into manuals and riding the trail playfully.

With predictable cornering manners and progressive-feeling rear-suspension kinematics, thanks to its forward pivot point, this bike is devastating on the descents.

Rather than insulating you from every bump, the Top Fuel feels like a bike that works with you, involving the rider in the glory of a corner well hit or an obstacle correctly anticipated. It flatters your moments of brilliance but buffers any mistakes stoically.

Indeed, the level of grip and confidence is so high that it’s not until you get onto rougher black trails or find yourself offline that you need to brace for impact – and remember this isn’t an enduro bike.

This means it’s easy to inadvertently throw the Top Fuel way out of its depth and get carried away with the fun you’re having on the descent.

Over trail-centre features, the bike has an addictive personality. It has pop for days, encouraging you to hop, skip and jump your way over the trail, leaving the ground at every opportunity.

Spy a rocky or rooty take-off, and the Top Fuel seems to want you to bounce the front tyre off the top and pull the bike skyward, before the low BB, and long front end scream to be slung through the following berm as fast as you dare.

Take it to the trees, and the wide Bontrager-branded bars and short stem, and tight 435mm chainstays, work together to ensure direction changes are jet-boat rather than oil tanker in speed, while the bike’s reaction times to pedal inputs put Usain Bolt’s to shame.

Hammer it has hard as you can into jumbled rocks or amassed roots and the fork can twang a bit, but the 120mm back end is also going to struggle when you really batter it through the chunder, despite the shock’s progression later in its stroke.

Spend a little bit of time learning how the bike likes to be ridden and you’ll find yourself hunting out opportunities to jump over these or smooth the line with finesse anyway.

Okay, if you spend your weekends searching out the gnarliest lines, then the Top Fuel might not be for you – but there are other bikes in this category that’ll float your boat.

The four-piston Shimano brakes offer predictable, yet punchy power, so whether you’re grabbing a fistful of stopping power when you’re hauling down the trail, or deftly trying to shimmy down a tight, steep, slow-speed tech-fest, you’re in ultimate control.

Yes, the small rotors do lack some outright power, but at least boosting their size is a quick, easy and cheap way of adding braking grunt.

For the majority of everyday trail riders, the Top Fuel has every trick in the book ready to pull out at a moment’s notice, whether you’re rallying trail centres, carving turns in the woods, or developing your skills on steeper, more technical terrain.

How does the Trek Top Fuel 8 compare with the YT Izzo Core 2?

In terms of a light and fast machine for tackling less technically demanding trails, the YT Izzo Core 2 seems like the obvious comparison.

Both bikes give a spirited fight on the climbs. The Trek is perhaps a little perkier, with a taut back end that doesn’t waste your watts.

The Izzo might not be quite as stable as the Trek under pedalling pressure, and the lockout is a pain to access, but the Maxxis Forekaster tyres zip along with minimal resistance, really making the bike fly up climbs.

Add in a supple early stroke that helps generate grip, and I found the Izzo gave me little to complain about uphill.

Despite very much coming from the downcountry side of things, the Top Fuel 8 is a ripper on the descents. The tyres play a massive part in this, with a more pronounced shoulder tread than the Forekasters on the Izzo. This makes the Top Fuel much more confident when pushing hard on mixed surfaces.

The suspension is a bit of a toss-up here. Fox’s 34 Performance fork on the Izzo is a smooth operator, while the SID feels a little more aggressive in its damping. At the back, though it has less travel, the Trek seems to deal with repeated big hits a little better, though I’d say the Izzo is smoother on low-amplitude chatter.

Trek Top Fuel 8 bottom line

Picking a 120mm-travel bike as my Trail Bike of the Year took a bit of soul searching. The diversity of bikes available aimed at the trail rider is as broad as the trails on which they’re ridden.

But the Top Fuel stole my heart (if not my head) in 2022. A trail bike needs to do it all – climb well, descend with authority, and ask to come back for more and more.

The Top Fuel gets to the top of the hill without making us yearn for our XC rigs, made me grin like a Cheshire cat on fast flow trails and rarely baulked when gradients steepened and a firm grip on bar and brake lever was required to safely navigate to the bottom.

If you want a bike to do it all and trust that it’s quality, not quantity of suspension that does the bulk of the work, give a shorter-travel, more agile bike a shot – you probably won’t regret it.

Trail Bike of the Year 2022 | How we tested

We expect a lot of the modern trail bike, so testing to find this year’s Trail Bike of the Year not only had to be thorough, but incredibly varied, too.

This meant spending one day sitting in the saddle for hours on end ticking off miles of singletrack, and the next blasting down bike park runs, giving the bikes a proper hammering in the process.

Of course, there was a decent amount of everything in the middle, including scrabbling up steep, forested climbs before sliding back down and, quite simply, just playing about in the woods.

Most of our testing took place around the Forest of Dean or in south Wales, with a cheeky trip to Scotland thrown in for good measure.

To come out on top, we wanted a bike that could climb with close to the efficiency of the best cross-country mountain bikes , but still manage to descend with some of the composure you’re likely to find from an enduro bike .

If the bike felt sluggish and lethargic on an all-day epic, or skittish and nervous when tackling a technical descent, then it simply wouldn’t make the cut as this year’s best trail bike .

With such a competitive selection of bikes on test, deciding on the winner happened late in the day. In fact, it wasn’t until we were riding on the final photo shoot that we settled on the 2022 winner, which just goes to show how tough the competition has been.

Our Trail Bike of the Year 2022 contenders are: