trek bike fuel ex 8

Trek Fuel EX 8 review – still one of the best trail MTBs?

Trek’s alloy fuel ex trail mountain bike lacks the latest features but is the overall package still a winner.

Bike Perfect Verdict

Heavy frame that misses the latest features but still a great package for fast and precise all round mountain biking

Tight, precise frame

Sorted all round handling

Very efficient suspension feel

Durable Shimano kit

Excellent sizing options

Heavy frame

No internal storage

Press fit bottom bracket

Top Fuel is more playful

Why trust BikePerfect Our cycling experts have decades of testing experience. We\'ll always share our unbiased opinions on bikes and gear. Find out more about how we test.

Trek’s Fuel EX has been one of the best mountain bikes in the world for years, but the alloy-framed 8 is lacking some of the features the latest alloy and carbon Treks. High-durability component spec matches the vibe of a really well-balanced bike. One that plans ahead, hands its homework in early (having double checked it) and rarely puts a wheel wrong or goads you into being silly yourself. So how has Trek done that and is there a better option in the range if you want something short on travel but big on fun?

Design and aesthetics

Trek has been using a rocker link-driven, vertical shock suspension design on its bikes for so long that “Looks like a Trek Session” is a cliche on most MTB forums. No surprise then that the Fuel EX continues the clean looks which leave plenty of room for a big bottle on the down tube and strap-on storage. You don’t get the internal storage of the newer Top Fuel alloy frame though and this older frame still uses a press-fit bottom bracket rather than reverting to a more reliable threaded  format. There are ISCG chain keeper tabs on the BB though, a wider-angle Knock Block steering limiter to stop bars hitting the frame in a crash and rear axle concentric ABP rear suspension pivot. Cunning zip tie tabbed ‘Control Freak’ internal cable routing and rubber frame armor including molded chainstay sleeves keep things quiet. 

You also get the 0.5-degree geometry change ‘Mino Link’ flip chip at the seat stay/rocker pivot. That changes head angle from 65.5- to 65-degrees and effective seat angle from 75.5- to 75-degrees on the Large I tested. Reach also shifts from 475 to 470mm and BB height drops from 346 to 340mm. The big win with choosing a Trek though is the sheer range of sizes from XXS to XXL including a sweet spot ML in the centre. Smaller bikes also run 27.5in wheels for proportional balance, too, although the chainstays are the same length on all frame sizes. The Fuel EX 8 is also available in three different two-tone color options.

Specification

Trek acknowledges that the ‘priority is on the parts’ with the EX 8 and the highlight is an almost complete Shimano XT drivetrain (the chain is SLX). The Fox Float shock is a custom unit, too, using a Penske race car derived RE:aktiv damper setup for a pert-pedaling feel on top of the 130mm travel. The 140mm Fox 34 fork is the stock Rhythm spec though and the Shimano brakes are basic four-piston MT400s. Bontrager’s functional Line component range completes the bike in well-judged, size-specific cockpit options although dropper post strokes are short on the larger sizes. Big volume versions of Bontrager’s XR5 and XR4 tires on Bontrager Line Comp 30mm internal rims put plenty of air between bike and trail for protection, too.

Performance

While the EX8 isn’t light at just under 15kg (a full kilo heavier than Trek claims) it’s in the ballpark for a mid-travel, alloy-framed bike at this price. What really stands out is how well it hides that weight when it comes to pedaling. The big tires don’t drag nearly as much as they look like they might, while the RE:aktiv shock and overall kinematic give it a really clean, crisp and stable platform to put down power from. That means even with three potential low-compression settings to play with, we rarely felt compelled to flick it out of full open unless we were hoofing uphill out of the saddle. Add the clean shifting, top-quality Shimano XT drivetrain and the Fuel EX is a great choice for high-mileage rides and riders. The fast-engaging ‘Rapid Drive’ freehub and relatively high ground clearance are a bonus for anyone who likes to kick hard out of corners or attack rough technical climbs, too. The efficient suspension feel still gives enough sensitivity to track the ground under power and you can drop pressures in the big tires if you’re into a proper ‘crawler/swamper’ feel. 

The 140mm fork/130mm rear travel feels well balanced on the trail and the Grip damper Fox Rhythm repeatedly proved why its our favorite cost-effective fork. Trek’s suspension calculator is accurate enough to get most people sorted on set-up for most situations. The angles and proportions of the model we tested were confident at speed on jumps but still turned in promptly on woodland twisters. Even the basic Shimano brakes feel better than normal through the neutral suspension responses created by the ABP pivot and the 200mm rotor up front boosts power, too.

While you could speed up reactions with a shorter stem, the stock setup probably suits its overall character better. That’s because while it will pop and play off trailside opportunities if you’re in the mood, it does tend to sit on top of an already relatively high ride height rather than sucking down onto the trail and railing. Interestingly that’s a big - and counter intuitive - difference to the Top Fuel 8. With slightly steeper angles, less travel, significantly different suspension kinematic and top-spec RockShox rear shock, Trek’s pocket rocket has an addictively playful charisma that’s very much at odds with it’s ‘XC’ categorization. 

In fact, despite it being heavier we’d probably opt for the Fuel EX for long marathon-style or efficiency-based events, especially as it’s significantly cheaper than its little brother, leaving you more cash for race entries and energy products. Just make sure you keep an eye on the press-fit bottom bracket and get it replaced as soon as it shows any signs of wobble/creak as that can eventually creates frame issues.

Trek’s Fuel range might be a bit backwards when it comes to assigning categories based on travel but the main thing is that the Fuel EX is still a really efficient, enjoyable and fitness/skill flattering all rounder. While it misses out on the internal storage, threaded BB and super-plush playfulness of the Top Fuel, Shimano XT will always bring a lot of hard riding boys (and girls) to the yard. Those are exactly the riders who’ll appreciate just how well this extremely well balanced bike covers ground and keeps a fresh and sharp feel long into the day, and down tough technical sections, too. 

Tech Specs: Trek Fuel EX 8 XT

• Price: $3,929.99 / £3,200
• Discipline: Trail
• Head angle: 66/66.5-degrees
• Frame material: Trek Alpha Platinum Aluminum
• Sizes: XS, S, M, M/L, L (tested) XL, XXL
• Weight: 14.9kg
• Wheel size: 29 x 2.3in
• Suspension (front/rear): Fox Rhythm 34, Float EVOL 140mm travel, 44mm offset/Fox Performance Float EVOL, 3-position RE:aktiv 130mm travel
• Components: Shimano XT 10-51T, 12-speed gearing, shifter, chainset and cassette. Shimano SLX chain. Shimano MT400 brakes with 200/180mm rotors. Bontrager XR4 Team Issue 29 x 2.6in front and Bontrager XR5 Team Issue 29 x 2.5in rear tires on Bontrager Line Comp 30 wheels. Bontrager Line 780 x 35mm bar and 50 x 35 mm stem, Bontrager Line Dropper 150mm dropper post, Bontrager Arvada saddle

Guy has been working on Bike Perfect since launch in 2019. He started 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, Specialized Chisel, custom Nicolai enduro tandem, Landescape/Swallow custom gravel tandem

Height: 180cm

Weight: 69kg

• Guy Kesteven Technical-Editor-at-Large

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Trek Fuel EX 8

• AUS $ NZD $ USD $ CAD $ GBP £ EUR €

Size / 15.5", 17.5", 18.5", 19.5", 21.5"

At a glance

Where to buy.

Specifications

• Frame Alpha Red Aluminum w/R1i Trail Tuned Suspension, ABP pivot, Full Floater, Aluminum EVO Link, Hi/Lo chainstays, oversized sealed bearings, 120mm rear wheel travel
• Wheels Bontrager Race
• Wheel Size 26"
• Tires Bontrager Jones XR, 26x2.2/2.25"; 120 tpi, folding
• Crank Shimano Deore LX 44/32/22
• Front Derailleur Shimano Deore LX
• Rear Derailleur Shimano Deore XT "Shadow"
• Shifters Shimano Deore LX, 9 speed
• Brakeset Avid Juicy 5, hydraulic disc; 185mm rotors (160 mm rear rotor on 15.5, 17.5, 18.5" sizes)
• Handlebar Bontrager Race, 40mm rise, 31.8mm
• Saddle Bontrager Race
• Seatpost Bontrager Race
• Stem Bontrager Race, 7 degree, 31.8mm
• Headset Aheadset w/cartridge bearings, sealed, alloy

Q: Where to buy a 2008 Trek Fuel EX 8?

The 2008 Trek Fuel EX 8 may be purchased directly from Trek .

Q: What size wheels does the 2008 Trek Fuel EX 8 have?

The 2008 Trek Fuel EX 8 has 26" wheels.

Q: What size 2008 Trek Fuel EX 8 should I get?

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Trek Fuel EX 8 review

130mm travel full-suspension bike

Russell Burton/Future Publishing

Jon Woodhouse

Trek’s Fuel EX has been a Trail Bike of the Year winner as well as a close contender . It’s still a very safe, efficient partner for tackling technical singletrack or long days in the hills, but it’s focused more towards cruise control than chasing the ragged edge.

Ride & handling: Suited to all-day adventures

The exposed rocks of our heavily armoured test trails highlighted a harsher, more chattery ride than the 650b and 29in wheels created on competing Trail Bike of the Year contenders . The Bontrager rubber gives good grip and their low weight helps to keep the ride lively rather than lung busting on more stop/start trails.

Add the Shimano based-spec and you’re looking at a bike that’s really well suited to heading out into the hills with a map in your pack and an adventure in your head. It felt very comfortable among the vistas and long winding trails of the second day of wild, mountain testing. It worked really well on more natural trails where big hits were generally singular and corners too loose or greasy to load the fork up.

The Trek started to feel out of its depth against the latest bikes when we got aggressive on trail centre terrain. The DRCV twin chamber fork moves less than a standard one when pedalling but swallows bigger hits with full-stroke eagerness. This reduces loose and chattery corner traction, and the sudden dive comes at just the point you want to drive the front end through berms or keep it high under hard braking.

Even with the broad bar overseeing your steering efforts, the front end feels steeper than it is, with a nervous, fidgety feel in corners if you’re pushing it hard.

Frame & equipment: Sharp-tracking frameset with DRCV shock

With 130mm of rear stroke and 130mm up front the Fuel sits bang in the centre of the do-it-all category for travel, but the wide bar suggests a bit more attitude and control than you might expect. The proprietary DRCV (Dual Rate Control Valve) dual chamber shock also extends impact control deeper than you’d expect at first.

In normal pedalling or rolling situations the top chamber gives a tight and firmly-sprung response that keeps power inputs crisp. This helps offset the high overall weight of the bike on climbs or sprints, to the point where it’s a surprise what you’ve been propelling when you pick it up.

If you wallop something bigger the second chamber of the shock is prodded open to increase its impact appetite, stopping the big hit Buckaroo and pinch flat problems you’d otherwise expect from a 130mm 26in-wheeled bike.

The Active Braking Pivot axle rear pivot and Full Floater shock – it’s squeezed between linkage and the chainstay tip rather than frame – keep things controlled, buoyant and unaffected by braking. The Evolution-spec damper in the Fox shock felt better than similar setups in other bikes when we were pushing the pace.

This bike was tested as part of What Mountain Bike magazine’s 2013 Trail Bike of the Year feature – read the full results in issue 147, available on Apple Newsstand and Zinio .

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Trek Fuel EX 2023 Review | A bigger, musclier & hugely adaptable trail bike

The not-so-minor details.

2023 Trek Fuel EX

https://www.trekbikes.com

$4,999 AUD - $8,999 AUD

- Sturdy, flex-free chassis - Superb geometry with adjustable head angle - Efficient & comfortable climbing performance - Coil shock, big fork & mullet compatibility - Mechanic-friendly frame furnishings - Internal storage

- Frame is on the heavy side - Rear shock tune lacks small-bump suppleness - Rattly rear thru-axle lever

Wil reviews the Trek Fuel EX 2023

Having undergone a ground-up redesign for 2023, the Trek Fuel EX has entered its burliest and biggest travel form yet. This latest model represents the 6th generation of Trek’s popular mid-travel trail bike, with the original having debuted all the way back in 2005. Trail riding has evolved a lot since then, and the new Fuel EX aims to keep up with that evolution by incorporating almost every mod-con you can think of.

Of course it’s big news whenever Trek releases a new Fuel EX, and given how important this bike is for the US brand, we were curious to see how the raft of updates would play out on the trail. We had a bit of an idea, having thoroughly enjoyed riding the electrified Trek Fuel EXe over the past few months. Would the muscle-powered version deliver the same good vibes? And how would it compare to the previous models that have given us so many fond riding memories over the years? We’ve been putting the Trek Fuel EX 2023 to the test to find out!

Watch our video review of the Trek Fuel EX 2023:

Along with the downtube storage, generous frame armour and size-specific chainstays, the Fuel EX appears to pack in almost everything you could possibly want in a modern trail bike.

An overview of the Trek Fuel EX 2023

For 2023, the Trek Fuel EX is built around an entirely new frame that’s produced in carbon and alloy variants. Suspension travel has increased by 10mm at both ends, with the new Fuel EX now sporting a 150mm fork and 140mm of rear travel via the ABP four-bar suspension design.

It’s worth noting that the frame will handle a 160mm travel fork, and thanks to the two-position Mino Link, it can also be run as a mullet. Borrowed from the Session downhill bike, there’s a two-position flip chip at the lower shock mount that offers linear and progressive settings. The latter option is what makes the new Fuel EX coil shock compatible.

On top of that, Trek will be offering aftermarket headset cups to steepen or slacken the head angle by a degree. Along with the downtube storage, generous frame armour and size-specific chainstays, the Fuel EX appears to pack in almost everything you could possibly want in a modern trail bike. It’s certainly an appealing package on paper, and one that’s ready to take on contemporaries like the Specialized Stumpjumper , Merida One-Forty , Canyon Spectral and Giant Trance X .

Trek Fuel EX price & specs

There are a number of different models available in the Trek Fuel EX 2023 lineup, though availability will vary depending on where you are in the world.

In Australia, prices currently range from $4,999 AUD for the Fuel EX 7, and go up to $8,999 AUD for the Fuel EX 9.8 XT model. The cheapest option is actually the Fuel EX 5, though that model carries over the previous generation frame. For a closer look at the specs, prices and all the new details, check out our Trek Fuel EX 2023 overview article for more.

Here we’ll be diving into our experience of testing the Trek Fuel EX 9.9 XX1 AXS model, which will be available in Australia in limited quantities through the custom Project One bike builder. It’s a media bike that was provided to us by Trek, and of course it comes dripping with lots of gold, carbon and wireless bits. However, as usual with our reviews, we won’t be going into detail about the Gucci-level spec. Instead, we’ll be concentrating on the important aspects that are shared throughout the Fuel EX lineup; the frame design, suspension performance and its on-trail handling.

2023 Trek Fuel EX 9.9 XX1 AXS

• Frame |  OCLV Mountain Carbon Fibre, ABP Suspension Design, 140mm Travel
• Fork |  Fox 36, Factory Series, GRIP2 Damper, 44mm Offset, 150mm Travel
• Shock |  Fox Float X, Factory Series, 185x55mm
• Wheels |  Bontrager Line Pro 30, OCLV Carbon Rims, 29mm Inner Width
• Tyres |  Bontrager SE5 Team Issue 2.5in Front & Rear
• Drivetrain |  SRAM XX1 Eagle AXS1×12 w/30T Crankset & 10-52T Cassette
• Brakes |  SRAM Code RSC 4-Piston
• Bar |  Bontrager RSL Integrated, OCLV Carbon, 27.5mm Rise, 820mm Width
• Stem |  Bontrager RSL Integrated, OCLV Carbon, 45mm Length
• Seatpost |  RockShox Reverb AXS, 34.9mm Diameter, Travel: 100mm (S), 150mm (M-M/L), 170mm (L), 200mm (XL)
• Saddle |  Bontrager Arvada, Austentite Rails
• Confirmed Weight | 14.4kg
• RRP |  $TBC

The chassis feels near-bombproof, and combined with the supportive suspension, powerful brakes and high volume rubber, you’re served up plenty of confidence for pushing the front wheel into steep chutes and over technical A-lines.

Trek Fuel EX size & geometry

From X-Small through to XX-Large, the Trek Fuel EX is produced in no fewer than seven different sizes. Seven! Given that many brands only offer four or sometimes even just three frame sizes, that’s impressive.

The two smallest sizes feature 27.5in wheels, while the Medium and above come standard with 29in wheels. The Small is the only option that is available in either wheelsize.

At 175cm tall I’ve been riding a Medium, which features a 450mm reach. Thanks to the use of short seat tubes, a rider of my height could easily upsize to the M/L size to get a longer 470mm reach. Personally, I’ve found the fit of the Medium to be spot-on.

As for geometry, the Fuel EX features a 64.5° head angle and approximately a 77.5° effective seat tube angle in its stock configuration. The rear centre length varies between sizes, going up to 450mm on the largest frame. On the Medium I’ve been riding, the rear centre is a compact 435mm.

Coming off the Fuel EXe, I found it easy to settle into the Fuel EX. The only modification I needed to perform was to chop the comically wide handlebars from 820mm down to a more reasonable 780mm.

Suspension & tyre setup

Getting the Fuel EX set up is made easy thanks to Trek’s detailed online suspension calculator . Input the bike model and your riding weight, and out spits suggested air pressure and rebound settings for both the fork and shock. It even suggests tyre pressures, giving you a good place to start before hitting the trail. When brands like Canyon struggle to provide any recommendations at all, Trek should be commended for helping riders to get the most out of their bike.

For my 68kg riding weight, Trek suggests setting up the Fox 36 fork slightly softer and slower than usual. Recommended rear shock sag is 29%, and the calculator’s suggestion of 158psi got me to exactly that figure. Initially I set the rebound at 6/15 clicks as recommended, but while everything felt quite balanced front to back, the suspension was a little sluggish and duller than I wanted. Speeding up the rebound by a couple of clicks in both the fork and shock helped to make the whole bike feel a bit more lively, while improving small-bump reactivity.

Although the Bontrager SE5 tyres feature reinforced Core Strength casings, I still fitted a CushCore Pro insert to provide some additional pinch-flat protection and insurance for the carbon rims. Tyre pressures were set as per Trek’s recommendations with 20psi in the front and 22psi in the rear.

Trek Fuel EX weight

Confirmed weight for our Trek Fuel EX test bike is 14.4kg. That’s with the tyres set up tubeless, but without the CushCore insert or pedals.

It’s on the heavier side for a high-end carbon trail bike, though the 2.5in tyres, stocky carbon wheels and AXS components aren’t exactly the lightest going. Of course weights do vary throughout the Fuel EX lineup depending on the spec, and you can see the weights for all the different models in our range overview .

A contributing factor to the overall weight is the new frame, which has gained almost 700g over its predecessor. Trek claims the carbon frame weighs 3.4kg with the rear shock, making it a bit of a porker alongside some of the competition;

• Scott Genius HMX Carbon: 2,249g
• Specialized Stumpjumper Carbon: 2,280g
• Giant Trance X Advanced Pro 29: 2,498g
• Specialized Stumpjumper EVO Carbon: 2,750g
• Canyon Spectral CF: 3,047g
• Trek Fuel EX Carbon: 3,400g

The new alloy Fuel EX frame is heavier again, coming in at a hefty 4.6kg with shock.

Of course weight isn’t everything, and it’s unsurprising that the new frame has gotten heavier given how much longer and slacker it is. Still, for those who are especially concerned by grams, there are certainly lighter options on the market.

What do we dig about the Trek Fuel EX 2023?

With its added heft and updated geometry, the Trek Fuel EX 2023 is no doubt the burliest iteration yet. The chassis feels near-bombproof, and combined with the supportive suspension, powerful brakes and high volume rubber, you’re served up plenty of confidence for pushing the front wheel into steep chutes and over technical A-lines.

Indeed it’s massively capable for a 140mm travel bike, with the slack 64.5° head angle and roomy wheelbase giving it a purposeful stance on the trail. The geometry is superb, with welcome updates that have brought the Fuel EX right up to speed.

The steeper seat angle is particularly noticeable over the old bike, providing a much improved seated position on steep climbs. Pedalling efficiency has also levelled up. Trek has lifted the main pivot above the chainring to increase anti-squat, which helps to reduce pedal-induced bobbing. The Float X shock has a two-position climb switch, but I never once needed to use it while riding off-road since the rear end is so well behaved.

It rips through the turns

Once up to speed on flower singletrack, the taut chassis means the Trek Fuel EX is highly responsive when rounding corners and pushing into berms.

With its boxy downtube, split top tube and the supporting strut for the lower shock mount, the front triangle is heavily braced to resist torsional flex. Along with the wide main pivot and boxy one-piece chainstays, the Fuel EX possesses a strong spine from its shapely head tube to the rear thru-axle. The muscly frame effectively translates handling inputs while resisting lateral deflection through the turns.

Likewise, the short rear end and generous 38mm BB drop are fantastic when threading your way through twisty sections of trail, keeping you connected to the terrain and contributing to the playful ride quality. The low-hanging BB did mean I caught the pedals occasionally, so those who frequent off-piste terrain and technical climbs will want to consider flipping the Mino Link into the High position to indulge in an extra 7mm of pedal clearance.

Otherwise the riding position and weight distribution are totally sorted. The handling is approachable, and the Fuel EX doesn’t demand a whole lot from you as the rider. Compared to the old bike it does need a more concerted lean when entering tighter corners, though this is a part of the natural evolution of modern trail bike geometry. Even if you’re coming off a 5-year old bike, you’ll only need a few rides to get accustomed to the Fuel EX’s steering behaviour.

Trail-tweakable

In addition to the Mino Link, we’ve also been experimenting with the lower shock flip chip on the Trek Fuel EX. Requiring just a single 6mm hex key, it’s a quick adjustment to make trailside, and the change in suspension behaviour is noticeable.

I ended up preferring the ‘Less’ setting, which provides a more linear leverage rate. With the shock set at the recommended sag, this position provides great pedalling support, along with more comfort and activity deeper into the stroke. There’s still a good deal of progression though. Combined with the large bottom-out bumper in the Float X shock, hitting full travel proved to be a well-controlled affair.

One of our fellow testers, who generally spends more time in the air than on the ground, preferred riding in the ‘More’ setting. This increases progression, providing a stronger ramp-up in the latter half of the travel. He also reduced the shock pressure by 5psi to further enhance small-bump compliance, while still being able to enjoy the additional big-hit support. Pedal efficiency isn’t as stable in this setting, but it does mean the Fuel EX takes to jumps like a duck to water, popping off lips enthusiastically and absorbing hard landings with a solid and flex-free touchdown.

One thing to note on the More/Less flip chip is that while you are altering the progression of the air spring, you’re also affecting the damper too. As well as adjusting air pressure, we found we needed to tweak the rebound and low-speed compression settings between the two positions. It is indeed a useful tuning tool, but it doesn’t dispel the need for air volume spacers entirely.

What does it struggle with?

With the Trek Fuel EX adopting a beefier frame, the added weight is noticeable compared to lighter bikes in this category. That’s compounded by the heavy-duty brakes, stocky wheels and chunky tyres, which mean there’s more inertia to overcome during micro-accelerations on an undulating climb.

For those who are looking for a sharper and sprightlier trail bike to whip through the trees along smoother singletrack, the latest Trek Top Fuel will be a better fit. In comparison, the new Fuel EX is a burlier beast that thrives on steeper and more technical terrain.

Curiously, it does feel stiffer than the electrified version, the Fuel EXe . Despite both our test bikes featuring carbon frames with a near-identical build kit, I’ve found the Fuel EX to transmit more trail feedback.

Some of this may be due to structural differences, and perhaps the more favourable sprung-to-unsprung mass ratio on the electric version thanks to the added weight of the motor and and battery. Either way, the Fuel EX doesn’t exactly exude off-camber compliance. As a lighter rider on very rocky terrain, I’ve found myself getting knocked around a little more than I would like.

This sensation reminded me of the Canyon Spectral 125 , which proved to be overly stiff and quite uncomfortable at slower riding speeds. The Fuel EX is more compliant overall than the Spectral 125, but it’s still pretty stiff.

It’s not as supple as Fuel EX models gone by

Contributing to this sensation, the suspension isn’t as plush as previous Fuel EX models, particularly those that featured the Thru Shaft shock. Those bikes did require the rider to make use of the compression lever to provide pedalling support, but it meant that in the open mode the rear end absorbed the terrain like melted butter.

You may have noticed that Trek has been making a conscious move away from proprietary suspension components lately, and that’s coincided with building bikes that offer more neutral pedalling performance. The increased anti-squat is one part of the equation on the new Fuel EX, and the other part is the custom-tuned Float X, which Trek has configured with a digressive compression tune on the main piston. This creates a decent low-speed threshold, which provides a level of support that sits between the Open and Medium settings on the previous RE:aktiv damper.

The result is that you can ride with the shock fully open, and the Fuel EX still offers great stability under pedalling inputs, with no real need to activate the climb switch. If you detest remote lockouts and having to flip shock levers all the time, this will certainly be appealing.

The downside is that the suspension isn’t as supple over smaller rubble and at slower speeds. Along with the stiff chassis and carbon wheels, more of those vibrations are transmitted to the rider. As such, careful consideration with tyre pressure is needed to maximise grip and comfort.

Because there is more support however, the Fuel EX gives your feet a stronger platform to push off of, with greater feedback during high-load scenarios. Indeed the harder and faster you push, the better the Fuel EX responds. In that sense, it’s less of a comfy cruiser like its predecessors, and more of a mid-travel bruiser that loves to ride hard and fast.

Component highs & lows

As a complete bike, the Trek Fuel EX is a solid package that puts the emphasis on capability over light weight.

The Bontrager SE5 tyres are a good example, coming in at 1,100g each on our workshop scales. They roll reasonably well given their weight and size, and we’ve found them to provide consistent grip on rocky, hard-packed soil, which will suit most Aussie trail riders. The tread is a little shallow though, and the compound isn’t the softest, which sees them struggling to latch on when the conditions are wet and loose. We’d prefer something a little stickier and toothier up front, like a Maxxis Minion DHR II with 3C MaxxGrip rubber.

While the carbon Bontrager Line Pro rims are quite stiff, they have proven to be plenty tough. We’ve tested five of these wheelsets across various bikes over the past few years and we’ve not encountered a single issue. The y also come with a two-year crash replacement guarantee, which is great insurance given the hell that you can put this bike through. Furthermore, the frame itself comes with a lifetime warranty for the original owner.

There’s still plenty of real-world protection though, including a generous two-piece armour plate that bolts to the underside of the downtube. There’s also a metal chain-suck guard behind the chainring, and a full-coverage chainstay protector. Along with the fully guided internal cable routing, the Fuel EX is an impressively quiet and rattle-free bike on the trail. Well, except for the rear thru-axle lever, which I removed after the first ride.

Otherwise the finishing details are all sound. The adoption of a bigger 34.9mm seat tube diameter is welcome, as it accommodates a stiffer and stronger dropper post, particularly for the larger sizes. Mechanics will be happy to see a threaded BB shell, and we’re fans of the downtube storage. The trap door has none of the play that we encountered on the last Fuel EX we tested, with a tight fit and a nice lever action.

It’s certainly a high quality chassis, and many riders are likely to appreciate the in-built versatility. We’re looking forward to trying out the adjustable head angle once the aftermarket cups become available, and we’d also be keen to try out the Fuel EX with a coil shock. Setting it up as a mullet will be more straightforward, especially as you only need to buy an air spring to extend the Fox 36 up to 160mm of travel.

Trek Fuel EX vs Specialized Stumpjumper

Alongside the Trek Fuel EX, the Specialized Stumpjumper is one of the most popular and well-known trail bikes in this category. In terms of travel and the overall build, the Fuel EX sits right in between the regular Stumpjumper and the Stumpjumper EVO. However, it’s the regular Stumpy that I’ve been spending the most time on lately, both in its stock configuration and with a burlier mullet setup .

Compared to the Fuel EX, the Stumpjumper has a touch less travel with a 140mm fork and 130mm at the rear. It also uses a simpler suspension layout, with the carbon models employing a flex-stay design. Combined with its slimmer tube profiles, the carbon Stumpjumper frame is very light. Specialized claims it weighs just 2.28kg including the shock, which is over a kilo lighter than a carbon Fuel EX.

This theme extends to the Stumpjumper’s build kit, with Specialized electing for the skinnier Fox 34 over the 36. Along with an in-line shock, lighter brakes, wheels and tyres, there’s a considerable difference in the overall bike weight. For example, the Stumpjumper Pro we tested weighed 12.84kg.

While the geometry is pretty similar between the two bikes, the Specialized Stumpjumper rides much lighter on the trail compared to the Trek Fuel EX. It offers more comfort, with its lithe chassis and smooth suspension performance providing better compliance over rough terrain. It’s quite sporty and sprightly, though its active suspension design does need taming on the climbs by making use of the rear shock’s compression lever.

In comparison, the Fuel EX is more naturally efficient. It’s also more planted at speed, with its sturdy chassis and supportive suspension providing better big-hit capability. It feels more like a short travel enduro bike, which will suit heavier and harder riders.

Both bikes will handle a longer fork and can be set up as a mullet, though Specialized makes a specific link for the Stumpjumper to maintain the stock geometry. There is greater versatility in the Fuel EX chassis, with the option to adjust the head angle and fit a coil shock.

As for value, the Fuel EX offers a more appealing spec package. A Stumpjumper Expert sells for $9,800 AUD and comes with a Fox 34 GRIP2 fork, SRAM G2 brakes, an X01 drivetrain, alloy wheels and handlebars. In comparison, an equivalent Fuel EX 9.8 XT sells for $800 AUD less. It gets a simpler GRIP damper for its Fox 36 fork, though it does feature a piggyback shock, a Shimano XT groupset, a carbon one-piece RSL cockpit and carbon wheels with that 2-year crash replacement guarantee.

Flow’s Verdict

For many trail riders, the Trek Fuel EX 2023 is likely to tick just about every box on your new bike wish list. It’s as up to date as it gets, featuring loads of adjustability, internal storage and a nuanced approach to its size-specific geometry. Along with the increased travel and muscly frame, it offers greater stability and big-hit control over its predecessor, while still being a fun and involving bike to ride on modern flow trails.

It is a bit of a chonker though, so those who are looking for a lightweight and speedy trail bike may be better served by the latest Top Fuel .

The stiff chassis and supportive suspension also mean the Fuel EX tends to transmit more feedback, making it less comfortable to ride over rocky terrain. We’d be curious to try out a lighter shock tune to see how much of a difference that would make to the overall ride quality, but in its stock form the Fuel EX isn’t as plush as competitors like the Giant Trance X and Specialized Stumpjumper .

It is impressively efficient though, and the stable suspension gives you a load of support when you’re really giving it the beans on the descents. In this sense, the Fuel EX is closer in feel and performance to an enduro bike. You’ll still want to look towards the Slash if you’re serious about racing, but outside of the tape the Fuel EX will handle just about everything a modern trail centre or bikepark could throw at it. And for those who really want to up the limits, the adaptable chassis can easily be configured for some pretty aggressive riding.

Indeed for those who are chasing maximum capability without going to a big, spongy enduro bike, the Fuel EX is a mighty appealing option.

You’ll still want to look towards the Slash if you’re serious about racing, but outside of the tape the Fuel EX will handle just about everything a modern trail centre or bikepark could throw at it.

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• Fuel EX 8 Gen 5

Trek Fuel EX 8 Gen 5 - 2022

Fuel EX 8 is the ideal trail bike for riders who want a versatile full suspension ripper that makes soul-crushing climbs less painful, but can also huck rowdy trails. It hits the sweet spot of value and performance in our mountain bike lineup by combining high-end parts with a stout but light alloy frame. It's right for you if... You're cool with your wheels leaving the ground, but you also like to go the distance on marathon singletrack sessions. You want a bike that lets you crush any trail, and your priority is on the parts. The tech you get An alloy frame, 140mm FOX Rhythm 34 fork, and 130mm of rear travel with an extra-efficient RE:aktiv damper. A Shimano XT 1x12 drivetrain with an extra-low 51-tooth climbing gear, plus a Bontrager Line dropper post. The final word Fuel EX 8 gives you added efficiency with Shimano's latest, widest-range drivetrain and Trek's unique RE:aktiv damper that provides firm pedaling support without giving up any plush compliance. Why you'll love it - A wider gear range and more efficient suspension help you claw your way up tricky climbs you never thought you'd clean - If you measure quality in performance per dollar, you won't do better than Fuel EX 8 - This bike will make you want to rail every corner, smash every rock garden, and charge every descent - The shifter-style, underbar remote dropper post lever is super intuitive and easy to use - We expanded our size range to ensure a better fit for all riders. And, you get the fastest wheel that fits your frame: XS frames get 27.5" wheels, S - frames get to choose between 27.5" or 29", and sizes M to XL get 29" wheels

Dropper posts

A dropper seatpost allows you to quickly lower and raise your seat to give you an ideal riding position. Dropping your seat creates a lower center of gravity for better control and maneuverability on steep descents, while raising it puts you at normal riding height for efficient pedaling.

Construction can include either hydraulic- or cable-actuated systems and the post’s travel can either be infinitely adjustable or stopped at set intervals, depending on the model.

Dropper seatposts come in standard lengths and diameters and vary by the amount of travel.

Will my bike have a curved top tube?

Smaller frames (XS and S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. Larger frames (M and up) have a straight top tube because taller riders with longer legs typically don’t have the same issues with standover height.

Wheel size: Sizes X-Small – Small: 27.5-inch Sizes Small – XX-Large: 29-inch

Pedals sold separately, due to supply-chain issues, specs are subject to change without notice..

* Subject to change without notice.

Part Numbers

Trek Fuel EX 8 Trail Bike Review

Trek’s line of Fuel EX 8 trail bikes is designed to withstand wind, weather, and other wear-and-tear that they might throughout their lifetime.

The heavy-duty 130mm frame is made of hydroformed Alpha Platinum Aluminum frame, offering strength and stability with none of the rigidity that’s typically associated with aluminum frames.

The EX 8 is their most costly aluminum-framed model, but we think it’s a good deal for a shred-ready component package that features excellent suspension, a GX Eagle engine, a 150mm dropper, and hefty 2.6″ wide tires.

The frame is compatible with both standard-sized and plus-sized wheels and can comfortably seat adults ranging in height from 4’10.3″ to 6’7.5″ in height.

You can adjust the geometry of the Fuel EX using the Mino Link, although I often kept it in the ‘Low’ setting, which is optimum for 29in wheels. Reasonably priced, with the specification of good components for the budget, excellent minor bump compliance, and a versatile/well-rounded design. 

Its big wheelbase and slack head tube angle make it surprisingly stable at high speeds and confident in steep, rugged terrain.

The Trek Fuel EX 8 comes in four different models:

• The Fuel EX 8 29 : The most basic bike in the Fuel EX line, the 8 29 model includes Bontrager Line Comp 30 wheels and Bontrager XR4 Team Issue tires. An SRAM GX Eagle 12 speed shifter and rear derailleur give riders more control when navigating a variety of rough terrains.
• The  Trek Fuel EX 8 29 XT : This model offers a little bit more than its bare-bones cousin, including a Shimano Deore XT M8000 11 speed shifter and both front and rear Shimano derailleurs. The 8 29 XT also boasts a top-of-the-line Shimano MT500 hydraulic disc brake set.
• The  Trek Fuel EX 8 Women’s : This model is designed specifically to work with in tandem with the unique mechanics of a woman’s body. Plus-sized tires help to improve balance and traction, while a specially engineered Bontrager Evoke 2 women’s saddle offers a more comfortable ride.
• The Fuel EX 8 27.5 Plus : The 8 27.5 Plus is the most advanced bike in the Fuel EX line. It offers additional stability when riding, with Bontrager sealed bearing alloy axles that provide boost 148/110 hub spacing and robust SUNringlé Duroc 40 SL 28-hole rims. The assembly includes Schwalbe Nobby Nic Performance wheels with Addix compound added for grip and longevity.

Each Fuel EX 8 bike comes equipped with exclusive suspension technology that allows it to act as both a long-distance trail bike or a high-performance XC bike.

Specially engineered Trek systems offer the most consistent possible ride, giving cyclists maximum control while enhancing safety.

The RE:aktiv suspension system improves the bike’s maneuverability, while a Full Floater setup absorbs shock and gives a comfortable ride even over rocky terrain.

Braking is also made easier by Trek’s patented Active Braking Pivot system, which prevents brakes from locking up on more strenuous trails.

Trek Fuel EX 8 Tech Specs

TREK FUEL EX 8 FRAME SIZE:  Alpha Platinum Aluminum 130mm frame. BRAKE TYPE:  SRAM Guide R hydraulic disc or Shimano MT500 hydraulic disc. SHIFTER:  SRAM GX Eagle 12 speed or a Shimano Deore XT M8000 11 speed. RIMS:  SUNringlé Duroc 40 SL 28-hole rims. TIRES:  Bontrager XR4 Team Issue tires or Schwalbe Nobby Nic Performance with Addix Compound.

What We Like

The Trek Fuel EX 8 is designed with both comfort and style in mind, boasting a sleek hydroformed frame that comes in black or silver, with pink highlights adding a vibrant touch to the Women’s model.

We like that the elegant design forgoes many bells and whistles that too often clutter up the appearance of top-of-the-line trail bikes. Fox Rhythm 34 Float, GRIP adjustable damper, tapered steerer, G2 Geometry w/51mm offset, Boost110, 130mm travel.

A 130mm Fox Rhythm 34 fork with the Grip damper sits up front. This is the most basic model 34, but it’s one that rarely disappoints me. The stock spring curve is a little linear, but if you add a volume spacer or two, it will ramp up towards the end of the stroke.

The bike’s frame is not only attractive but also lightweight and stronger than many other similar aluminum models.

Trek uses its own design of reinforced Alpha Platinum Aluminum, which doesn’t suffer from the rigidity of traditional aluminum.

An Alpha Platinum Aluminum frame not only makes the Fuel EX 8 fast, but also easy to handle and maneuver. The material is stiff enough to offer support but compliant enough that it doesn’t stress joints or muscles as you ride. A 148/110 boost also helps to strengthen and balance the frame by increasing spoke angles and creating a more stable base.

Perhaps one of our favorite features is Trek’s RE:aktiv system, which is designed to enhance the responsiveness of the Fuel EX 8.

It applies Formula 1 technology to the biking world, allowing riders to accelerate efficiently and control their bikes even at high speeds. A Full Floater rear shock setup also helps to improve handling by effectively absorbing shock.

Active Braking Pivot technology is another patented Trek system that’s designed to keep riders grounded and in control of their bike. By changing the placement of the rear suspension pivot, this system prevents brakes from locking up and offers cyclists both a safer and more consistent ride.

Despite all of the unique features that the Trek EX 8 has to offer, models are still on the lower end of the price range when it comes to quality trail bikes. Using treated aluminum makes the bike cheaper than similar carbon fiber options without sacrificing durability.

Read Also: T rek 520 Touring Bike Review

• Easy to handle
• Relatively inexpensive

What We Don’t Like

Though the Trek fuel ex 8 frame is made of treated aluminum, the Fuel EX 8 is significantly heavier than other aluminum models.

This not only makes it difficult to transport but can also affect acceleration. Most of the trek fuel ex 8 weight is found in the back of the bike, which can make it tough to handle on downhill trails.

Some riders have found that the tires included with the Fuel EX 8 don’t meet their demands when it comes to trail riding. While the wheels handle many types of terrain well, they are designed to cross rougher terrains with ease. The heavy weight and thick tread of Bontrager tires, in particular, can make it difficult for cyclists to make their way through boggy or muddy surfaces.

• Inappropriate tires

Buying Advice

The Trek Fuel EX 8 is made for a wide spectrum of cyclists, from the casual trail rider to the avid mountain biker.

There’s even a model for women that’s designed to give a safer, more comfortable ride.

While this bike works well for a wide variety of applications, however, the design is relatively bare-bones and may not offer additional features that more advanced cyclists typically look for in a piece of equipment.

No matter what you’re looking for in a bike, the Fuel EX 8 offers the very best of both trail navigation and an XC handling.

If you’re looking for a bike that safe, durable, and easy to maneuver, you should consider looking into Trek’s Fuel Ex 8 line for a cost-effective option also trek fx1 is good option.

TRek FUEL EX8.8

Why we liked it?

• Value for money
• Fast for a trail bike

87/100 our score

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Trek fuel ex 5 vs. Scott spark 960

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Tried finding a comparison for these two bike, but not a lot out there for the Scott (mostly others in the spark line). Hoping to buy one of these within the next few days, but am not sure which is the better bet. The trek is $1800 while the Scott is listed at $1900, but up until this weekend is at $1600. Just getting back into riding and am not really sure on which has the better components, and which I'll end up upgrading. Thanks,  

If you are just getting back into riding, start with the Scott. It has less (more manageable) suspension travel, and if it costs less, then if it fits it will be your best choice.  

IMO, don't waste your money with an EX5. It's such a baseline entry into the FS that it's not worth it. Go at least an EX6 and up.. As for Scott, couldn't tell you. Been seeing them more and more. I am considering one as my next bike. I demo'd a FS carbon model and loved it.  

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2024 Trek Fuel EX 8 GX AXS T-Type Gen 6 w/Upgrades - $4,499 (Cottleville, MO)

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New dual suspension bike? Scott Spark 960 vs Trek Top Fuel 7

By dupreeze1980 January 9, 2022 in What bike (or gear) to buy?

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Dupreeze1980.

Can I please get some advice in deciding between Scott Spark 960 or Trek Top Fuel 7.

Spark 960 vs the Top Fuel 7 looks very similar. Only a better front shock in the Trek?

Should I rather go for the Trek. Just concerned about resale, is Scott not much more popular?

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trek also has a better rear shock and frame storage 

trek will also be lighter ( by like 300 grams ) but not by much 

The bike that fits best! Reach, standing height etc. are most important. Components can be added when needed.

The wrong fitting bike is an expensive lesson to learn.

• Bicycle Yard WESTERN CAPE and thebob

Priority is getting the one which is the correct size for you. Sizing is vital to enjoying a comfortable and confident ride. Don't go for the wrong size cause you will end up paying school fees!

Providing you can get the right size in both bikes I'd also go for the Trek. Both are great bikes with different strengths and weaknesses. The Trek is better on the downs than the Scott, while the Scott is a bit better at technical climbing. The fork on the Scott is not great, whilst the 35 on the Trek is acceptable, but not the best though. Either can be upgraded (I have a SID the classifieds if you want to straight away 😀 ). Last but not least for whichever bike you get, make sure you have a decent shock pump and get your pressures dialed correctly for the correct sag front and rear.

Thanks will test both. Currently on XL hardtail that I will trade in for another XL.

I like the frame storage but not enough to influence my decision. Like the now hidden back shock of the Scott too.

Still just worried if resale will be same similar between the two products.

11 minutes ago, dupreeze1980 said: Thanks will test both. Currently on XL hardtail that I will trade in for another XL. I like the frame storage but not enough to influence my decision. Like the now hidden back shock of the Scott too. Still just worried if resale will be same similar between the two products.

just remember that hidden shock adds lots of complication to working on it 

remote lock not working lekker ? cool then how much of that bike needs to be disassembled to get to the dial ? 

If you close to 1.9m in height then XL it is. Many people are actually up sizing lately. For under 60k I see a xl super calibre on classifieds.

Interesting two bikes, keen to see how your test rides go.

Search the Hub ... Trek 7 frames crack ....

50 minutes ago, ChrisF said: Search the Hub ... Trek 7 frames crack ....

Trek does have a lifetime warranty on the frames for the first owner. Scott has a 5 year warranty.

The dropper on a Trek XL also has 20mm more travel than the Scott - 170mm vs 150mm.

7 minutes ago, HenryS said: Trek does have a lifetime warranty on the frames for the first owner. Scott has a 5 year warranty. The dropper on a Trek XL also has 20mm more travel than the Scott - 170mm vs 150mm.

Is that warantee transferable ?

PS .. that warantee was useless when my EX5 hub bearings disintegrated in less than 1000km, from NEW.  Trek was happy to sell a new hub, even stating it is a standard repair item .... Knipe_Racing made a custom puller to get the outer race out.

These biked may be okay for new buyers ... 2nd hand buyers proceed forewarned

1 hour ago, ChrisF said: Search the Hub ... Trek 7 frames crack ....

Because 1 frame cracked it means it is well documented problem?

11 hours ago, ChrisF said: Is that warantee transferable ?     PS .. that warantee was useless when my EX5 hub bearings disintegrated in less than 1000km, from NEW.  Trek was happy to sell a new hub, even stating it is a standard repair item .... Knipe_Racing made a custom puller to get the outer race out.     These biked may be okay for new buyers ... 2nd hand buyers proceed forewarned

2nd hand buyers should proceed with caution on every single thing they buy ..

• ChrisF , Koos Likkewaan and Chadvdw67

3 hours ago, ChrisF said: Search the Hub ... Trek 7 frames crack ....

Mine hasn't... Fake news

• Chadvdw67 , DNC and ChrisF

3 hours ago, dupreeze1980 said: Thanks will test both. Currently on XL hardtail that I will trade in for another XL. I like the frame storage but not enough to influence my decision. Like the now hidden back shock of the Scott too. Still just worried if resale will be same similar between the two products.

That hidden shock is either revolutionary or a gimmick that adds very little.

As I've recently welcomed a new top fuel 7 to the family I am very biased. 

I've owned the new Spark and now have a Top Fuel, so I have some experience. To get the shock out of the Spark you need to remove the cranks and take the rear wheel out. Not much more of a pain than a "normal" bike. For a home mechanic, no big deal, though I am sure a dealer will add some time for labour. The Scott shock is proprietary, so a few tools and parts are needed if you want to do a full service. Also good luck trying to get hold of a bigger or smaller volume spacer if needed.

The only proprietary item on the Top Fuel is the Knockblock, which can be neutralized by buying a part from Trek or getting the Dremel out.

As for warranty, Trek just replaced a BB on my Top Fuel 9.8XT with no fuss at all.

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