trek fuel ex gen 6 suspension setup

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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Trek Fuel EX 9.7 XT Gen 6 review

• Alan Muldoon
• November 6, 2023

Trek's shapeshifting 29er trail bike is packed with adjustability, but do the numbers add up?

Product Overview

Overall rating:, trek fuel ex 9.7 (2023).

• Great geometry, sizing and adjustability
• Needs a higher spec fork

Manufacturer:

Price as reviewed:.

Hot on the heels of the Trek Fuel EXe , the new Fuel EX shares a similar silhouette, albeit without the compact TQ motor and 360Wh battery. And just like the EXe, the EX is available with an aluminium or full carbon frame, where both options sport integrated down tube storage. It’s certainly a cutting-edge, with all mod-cons, but where does it stack up against the best full-suspension bikes on sale right now?

Trek Fuel EX 9.7 boasts chiselled good looks and a pin-sharp ride

Unlike the Specialized Stumpjumper Evo Elite Alloy that’s also in this head to head test, Trek doesn’t currently offer a high-end alloy build on the Fuel EX in the UK, so we went with the Gen 6 Fuel EX 9.7 XT, which is the entry-level carbon bike. With the more expensive carbon frame, the build kit clearly isn’t as bling as on the Specialized, which we’ll get to in just a minute. 

The Gen 6 Trek Fuel Ex 9.7 offers a fun, poppy and playful ride

Frame and geometry

First, let’s take a closer look at the frame. To bring the analogue bike inline with Trek’s mid-powered e-bike, frame travel has been bumped up to 140mm and when paired with the 150mm Fox Rhythm fork, the new EX is the most capable Fuel to date. 

Shimano drivetrain mixes 12-speed XT and SLX for a smooth, light shift action

And it’s not just the travel that’s been increased. The reach numbers have grown across all six frame sizes, and the head tube now accepts offset headset cups that offer +/-1º of head angle adjustment. Unfortunately, the cups are not supplied with the bike, and they have to be pressed into the frame, so head angle is not something you can really play around with trailside like on the Stumpy Evo. 

Aftermarket headset cups offer +/- 1º of head angle adjustment

Well, at least not with the headset cups. And that’s because the EX also sports Mino link flip chips in the suspension rocker link. In the low setting they give the EX a 64.4º head angle and a 338mm BB height. Flipping the Mino Link to the high position steepens the head angle by 0.5º and raises the BB height by 8mm. Taken together with the aftermarket headset cups, that gives you six unique geometry settings, just like on the Stumpy Evo. 

Trek’s Mino Link flip chips in the seatstays offer BB hight and head angle adjustment

And while Trek does not offer chainstay length adjustment, the Fuel EX does have size specific chainstay lengths: XS and S share 430mm chainstays, then you get 5mm jumps as you go up the size range: 435mm on the M, 440mm on M/L, 445mm on L and 450mm on the XL.

No chainstay length adjustment here, but the Fuel EX has size-specific rear ends

Trek has another adjustment up its sleeve though. By introducing a second set of Mino Links, this time in the lower shock mount, it offers riders two distinct progression rates for the suspension linkage. But why bother? Well, coil shocks and air shocks have different spring curves, so the progression rate of the suspension linkage on the Trek Fuel EX can now be tailor more precisely for both shock options. It’s handy too for riders that simply want more bottom out resistance from the stock Fox Float X air shock without having to crack open the air can to add volume spacers.

Coil or air? Flip chips in the lower shock mount offer two distinct suspension progression rates. 

Even though the Fox 36 Rhythm fork doesn’t get the self-aligning 15mm axle and lubrication channels found on the 36 Factory fork lowers, it’s still incredibly supple off the top. The district lack of initial friction and the free flowing oil in the Grip1 damper makes the 150mm Rhythm fork great at gobbling up trail chatter, even at higher speeds. The trade off then, is that it doesn’t offer the same degree of mid-stroke support, or adjustment as the Grip2 equipped fork on the Specialized. This means the rider has to work harder to offset the dynamic swings in geometry to stay centred on the bike. It’s why we ended up at a spring pressure on the guide chart for a 10kg heavier rider, just to get more support. 

Trek signature ABP suspension boasts 140mm travel and is married to a 150mm Fox 36 fork

And it’s a similar story with the rear suspension. Running less sag on the Fox Float X Performance shock not only made the Fuel EX climb better, it also offered more support for fast corners and drops. Yes, you trade some of that pitter patter comfort, but the firmer suspension settings front and rear definitely make it easier to ride the Fuel EX faster, up or down. 

The Fox 36 Rhythm fork has 150mm travel and gets the basic, but supple, Grip1 damper

Trek has missed a trick by not adding some extra tools to the removable rear axle lever on the EX. In addition to the 6mm hex key, Scott has managed to fit a 5mm and a T25 to a similar tool on the Genius . This was brought to our attention, because we struggled to get the Shimano SLX shifter to marry perfectly with the SRAM DB8 brakes and we needed a T25 to move the brake lever. In the end we ran the shifter pod inboard of the brake, just to get out of the way. 

The SRAM DB8 front brake also presented with a variable bite point, but it was nothing a quick bleed couldn’t fix. It’s worth noting though, that the DB8 brakes use mineral oil, not DOT brake fluid like all of the other SRAM brakes. Once sorted, the DB8 brakes offer better and more consistent stopping power, with a lighter lever feel than the Code RS units on the Stumpy Evo. 

SRAM’s DB8 brakes offer a light, smooth lever action, that backed up with ample stopping power from the 4-piston calliper

Get on the gas and freehub engagement with Line Comp 30 wheels is rapid, but there’s still a fair bit of clatter from the Shimano drivetrain when the trails get rougher. And it’s not the chain hitting the frame, it’s more like freehub clatter. The stock Bontrager XR5 Team issue tyres also make themselves vocal, as then tend to pop and ping of rocks and roots too readily for our linking.  

Performance

Even though the Trek Fuel EX has similar geometry and is actually longer in reach measurement than the Specialized Stumpy Evo, it rides like a smaller bike. And that’s simply because you have to shift your weight around more to maintain a balanced weight distribution between the contact patches of the tyres. We chalked this up to the suspension response of the Fox 36 Rhythm fork not offering enough support. 

With more travel and adjustability, the Trek Fuel Ex 9.7 has never been more capable

It’s almost as if the fork puts an artificial speed limiter on the Trek, even though it absorbs bumps really well. Much in the same way as soft suspension on a car makes it harder to drive fast. With a better fork, we’re pretty confident that the Fuel EX could be pushed so much harder. In fact the firmest suspension set up always felt best. 

Trek Fuel Ex 9.7 Gen 6

We even flipped the shock Mino Link to the more progressive setting, and while the O-ring on the shock body (the shaft is hidden under the air can) ended up in the exact same spot on every test run, the bike feet a little harsher on big hits, but altogether more stable. 

So the fork is smooth and plush, and the Fuel EX still makes for a fun and engaging ride. It’s poppy and playful, and while the sharp clean lines of the carbon frame catch the light perfectly, the square tube profiles on the EX seem to snag your knees and calf muscles more than normal, especially when pulling shapes in the air or getting sideways in a corner. Knee pads are recommended at all times then. 

Sharp lines make the Trek Fuel Ex 9.7 carbon frame eye-catching, but you can catch you legs on them too

Also we were under the impression that carbon doesn’t really like square edges, so you could argue that the design is more about aesthetics than outright performance or weight saving. The bottom line is that Trek needs to offer the alloy Fuel EX with a higher level build kit, especially the suspension components, instead of stopping short and simply using the carbon frame as the next step up in the performance ladder. 

Carbon frames are cool and all, and the weight savings are not to be sniffed at. But if you’re on a tighter budget, your money is better spent elsewhere. Ideally on a trail bike with an alloy frame and high-end suspension components. Trek doesn’t currently offer the alloy Fuel EX platform with 4-way adjustable damping, so a better fork is what’s needed to unlock the Trek Fuel EX 9.7 XT's full potential.  More adjustability isn’t for everyone though, but even with the recommended baseline settings the Specialized Stumpy Evo Elite Alloy always instilled more confidence and allowed us to ride faster in every situation. It’s not that the Trek was a slow bike, it simply wasn’t as fast.

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The NEW 2023 Trek Fuel EX Gen 6

Trek Fuel EX release date: September 8, 2022

What type of mountain bike is the Trek Fuel EX?

The new Trek Fuel EX Gen 6 shows off what a modern trail bike should be. New features including longer travel and impressive on-the-fly adjustability serve riders that have a soft spot for the steep stuff. The size-specific build is customized to the rider and added features make you feel one with the mountain. As trail riding evolves, achieving the perfect fit and ideal suspension settings have never been so close at hand. There's nothing you can't ride with the Fuel EX.

• Wheel size: 29" (S-XXL) or 27.5" (XS-S)
• Front travel: 150mm
• Rear travel: 140mm
• Tire clearance: 2.5"
• Size range: XS - XXL
• Frame: Carbon or alloy
• Colors: Deep Smoke, Mulsanne Blue, Satin Baja Yellow, Crimson, Matte Pennyflake

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Or keep scrolling to compare and contrast each model.

Fuel EX Overview Fuel EX Video --> Fuel EX Features Fuel EX Geometry Fuel EX Size Chart Fuel EX Models Fuel EX FAQs

Who’s it for?

The updated Gen 6 model is for riders who love all trails, flowy, rocky, steep, loose, and otherwise. It's for the renaissance rider who rides it all.

The adjustable geometry and suspension flip chip appeal to mountain bikers who prioritize tuning their setup to the current conditions. 

The Fuel EX is the longer-travel sibling of the snappy Trek Top Fuel designed for lighter, more XC style trails.

Why you'll love it

The Fuel EX is in a league of its own when it comes to on-the-go adjustability. 

Riders can now easily customize their geometry and suspension progression at the flip of a chip and optimize their ride no matter the trail. 

You’ll enjoy full days of downhill shuttle runs more than ever thanks to the redesigned frame, downtube guard, and handy internal storage.

Click to watch the Fuel EX video

What's new on the 2023 Trek Fuel EX?

Check out the Trek Fuel EX overview below and learn about all its exciting updates.

More front and rear travel

Year after year, riders continue to push the limits of trail bikes and the Fuel EX Gen 6 delivers longer travel suspension for dominating steeper terrain. 

Front travel increases from 130mm to 140mm and the rear shock provides 150mm of cushion, up from 140mm on the previous model.

Adjustable Geometry

The 2023 Fuel EX also introduces an innovative adjustable headset that can alter the head tube angle by +/- 1 degree depending on the desired slackness. 

The head tube angle can be set between 63.5 and 65.5 degrees. 

The angle adjust cups combine with the Mino Link for a total of 6 possible geometry configurations.

Size specific builds

Trek has matched the frame sizes with appropriate wheel choices and chainstay lengths to ensure all riders achieve an ideal fit. 

XS models run nimble 27.5” wheels whereas frame sizes medium and up have 29ers. Small frames are available in both wheel options. 

All riders, regardless of their height, can find a bike that provides maximum control and handling.

New frame features

The reimagined frame boasts trendy tech, including a full length downtube guard for protection from debris and tailgates during shuttle runs. 

The new threaded BB and guided internal routing keep everything neatly tucked away and low-maintenance. 

The larger 34.6mm seat tube accommodates sturdier dropper posts and now all frames— carbon and alloy— come with handy downtube storage .

Adjustable suspension progression

Riders can effortlessly switch between suspension settings via a flip chip on the lower shock mount. 

Choose between the plush, less progressive setting for better trail feedback or the more progressive setting that’s better for aggressive riding. 

The progressive option avoids bottoming-out and performs great with linear coil shocks if you choose to upgrade later on.

Trek Fuel EX Geometry

The new Fuel EX features a steeper seat angle and longer reach for more efficient climbing and improved handling on demanding descents. 

This more aggressive geometry can be further fine-tuned from inside the headset with angle adjust cups (sold separately) as well as the rear triangle Mino Link, r esulting in 6 different geo configurations .

Trek Fuel EX Size Chart

Trek outfitted each frame option with the correct wheel size to optimize handling. XS models come with 27.5” wheels, frames M and up run 29ers. People who ride S frames are often caught in the middle, so those frames are available with both wheel options.

*Size XXL available in alloy only.

2023 Trek Fuel EX For Sale

Shop all our Trek Fuel EX models

Or compare and contrast them at a glance below:

Fuel EX 9.9 XX1 AXS

Frame : Carbon

Fork : FOX Factory 36

Shock : Fox Performance Float X

Drivetrain : SRAM XX1 Eagle AXS

Brakes : SRAM Code RSC

Wheels : Bontrager Line Pro 30

Price : $10,749

Fuel EX 9.9 XTR

Fork : Fox Factory 36

Drivetrain : Shimano XTR M9100

Brakes : Shimano XTR M9120

Price : $9,749

Fuel EX 9.8 GX AXS

Fork : Fox Performance 36

Drivetrain : SRAM GX Eagle AXS

Brakes : SRAM Code R

Wheels : Bontrager Line Elite 30

Price : $7,699

Fuel EX 9.8 XT

Drivetrain : Shimano XT M8100

Brakes : Shimano XT M8120

Price : $6,249

Fuel EX 9.7 SLX/XT

Fork : Fox Rhythm 36

Brakes : Shimano M6120

Wheels : Bontrager Line Comp 30 

Price : $4,699

Fuel EX 8 XT

Frame : Aluminum

Wheels : Bontrager Line Comp 30

Price : $4,299

Fuel EX 7 Deore/XT

Fork : RockShox 35 Gold RL

Shock : Fox Performance Float EVOL

Brakes : Shimano MT420

Price : $3,699

Trek Fuel EX FAQs

Is the trek fuel ex a trail bike.

Yes, the 140/150mm full-suspension setup and large wheels are best suited for trail riding all over the mountain, from the big climbs, flowy traverses, and steep descents.

How does the adjustable headset work?

Riders can swap out the standard headset cup for special angle adjust cups that alter the head tube angle by +/- 1 degree, either adding slack or increasing steepness. The upper cup can be dropped in whereas the lower cup needs to be installed using a headset press.

How much does a Trek Fuel EX weigh?

Depending on the model, a size M Trek Fuel EX weighs between 31.6 lbs and 35.21 lbs.

Do all Fuel EX frames use the same wheel size?

No, XS frames use 27.5” wheels and sizes M and up use 29” wheels. S frames are available in both wheelsets.

Is the Trek Fuel EX tubeless compatible?

Yes, all models from Fuel EX 7 and up come ready for a tubeless setup and include valves, sealant, and appropriate tires.

What is the Fuel EX’s tire clearance?

Both the 27.5 and 29 models have room for 2.5” tires.

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Trek Fuel EX 6 review

Entry level version of popular full-sus bike

Russell Burton/Future Publishing

The EX 6 is the second cheapest in Trek’s Fuel lineup, and the whole line’s had a travel bump to 130mm front and rear – bar the cheaper EX 5, which makes do with a 120mm fork.

Ride & handling: Confidence inspiring, balanced handling

Without the two-stage DRCV shock there isn’t quite the sensation of having more than the actual travel, although the fact the EX does now have more helps. Even with the simpler Monarch shock, the Fuel is untroubled by most conditions. The extra 10mm hasn’t transformed this into an entirely different kind of bike, however – it handles the same and hasn’t put on weight.

The Fuel’s geometry has been gradually slackening over the years, although Trek’s goal is to deliver a great all-rounder so it’s not quite as laid back as some of the bikes here. The 68-degree head angle is still good for high-speed stability and poise, and the big 720mm bars give plenty of leverage to push it into corners, where it proves a vice-free and balanced handler.

On climbs the Fuel’s relatively low weight pays dividends. Trek haven’t gone for the extra-steep seat angle of some of the competition, but the cockpit layout works well for sustained pedalling. The back end is stable under power and unobtrusive over steppy, square-edge bumps.

Frame & equipment: Light for the price but Octalink seems low rent

While the Fuel EX frame looks the same across the range (except the carbon fibre models) there are some variations. The cheapest three (including this EX 6) get a conventional threaded bottom bracket, a band-on front mech and IS rear brake mount – by the time you get to the EX 8 you find a more up-to-the-minute press-fit bottom bracket shell, a direct-mount front mech and a post mount for the rear brake.

All Fuel EXs have a tapered head tube now, though the 130mm Sektor fork fitted here is a regular straight-steerer model. Nevertheless, the futureproofing is welcome.

The Fuel offers the expected Trek fundamentals, with the ABP concentric rear axle/pivot design and the floating shock – it’s mounted between the magnesium rocker and the swingarm, so it’s driven from both ends. You don’t get the clever twin-chamber DRCV shock found higher up the range, as it’s fitted with a RockShox Monarch RL instead.

There are no great surprises elsewhere, with a 3x10 Shimano mostly-Deore transmission – the rear mech gets an upgrade to SLX, although it’s not an anti-slap Shadow Plus unit.

The inclusion of an Octalink splined bottom bracket and chainset looks a bit penny-pinching (although in fairness the Trek is relatively cheap for its niche) – an HTII setup is easier to work on, but there’s nothing in it when it comes to shifting. While it may look slightly ‘budget,’ the fact the Fuel is light shows that Trek know what they’re doing with spec.

The high-end Fuels have always been great bikes, but we’ve sometimes found the cheaper models obviously compromised to hit a price. The EX 6 is entirely convincing. You get what you need from its pricier stablemates, and it’s a well-rounded ride.

This article was originally published in What Mountain Bike magazine, available on Apple Newsstand and Zinio .

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2023 Trek Fuel EX 8 Gen 6 Review

Are you looking for a durable, light-weight mountain bike to conquer the trails? The 2023 Trek Fuel EX 8 Gen 6 might be just what you need!

Mountain biking is a popular hobby that allows you to explore nature and have an amazing time doing it. With so many bikes on the market, it can be hard to find one that suits your exact needs.

The 2023 Trek Fuel EX 8 Gen 6 is designed to offer ultimate performance in both climbing and descending.

This review will look at the features of this model and discuss whether they fit into your riding requirements.

We’ll examine various aspects such as its geometry, components, suspension system, and overall design. Read on to learn why this bike may be worth the investment for hardcore mountain bikers!

The Trek Fuel EX 8 Gen 6 is a trail mountain bike that packs plenty of features to offer an incredible experience on the trails.

The lightweight aluminum frame, full-suspension design, and sleek aesthetics make this bike a fantastic option for mountain biking enthusiasts. Read on for our full review of the Trek Fuel EX 8 Gen 6 2023.

The 2023 Trek Fuel EX 8 Gen 6 is an incredibly durable and powerful mountain bike.

This light-weight aluminum full suspension bike features 140mm of travel, a Shimano 1×12 drivetrain, Shimano 4-piston hydraulic disc brakes, a Fox Rhythm 36 fork, and wide Bontrager Line Comp 30 wheels wrapped in Bontrager XR5 Team Issue tires for unbeatable control and traction.

Combining this with updated geometry for better agility and stability at speed, the Fuel EX 8 lets riders confidently tackle any trail.

– Constructed from lightweight Alpha Platinum Aluminum frame.

– Shimano 1×12 drivetrain provides smooth shifting performance.

– Shimano 4 piston hydraulic disc brakes offer powerful stopping power.

– Fox Rhythm 36, Float EVOL air spring 150mm travel fork provides great stability when tackling technical terrain

– Wide Bontrager Line Comp 30 wheels wrapped in Bontrager XR5 Team Issue tires provide ample grip on all surfaces.

– Updated geometry offers improved agility and stability at speed across varied terrain types.

The Trek Fuel EX 8 Gen 6 has an extremely lightweight aluminum frame.

Whether you’re navigating technical terrain or taking off down smooth singletrack, its light frame allows you to stay nimble as you maneuver through trails.

Plus, with its attractive matte pennyflake finish, it looks great too!

The bike features a full suspension setup featuring a combined 140mm of travel coming from a Fox Rhythm 36 fork up front and a Fox Performance Float X 185mm x 55mm shock out back, giving you a plush ride that can handle rough terrain and drops confidently.

This suspension setup makes it ideal for those who like to tackle more technical routes or enjoy the descent just as much as the climb.

On the components side, Trek has equipped their Fuel EX 8 Gen 6 with Shimano Deore XT 12 speed drivetrain and 4 piston brakes providing immense power and control over your ride no matter how treacherous it might be. The wide range 10-51t cassette is paired to a 30t chainring, all spun by a Shimano Deore crankset.

It comes with tubeless ready Bontrager Line Comp 30 wheels wrapped in XR5 Team Issue 29″x2.50″ tires for maximum grip all-round — making sure you can take on even the most extreme conditions with ease.

Comfort & Convenience

Additionally, this model is fitted with Bontrager’s comfortable Arvada saddle, and mounted to a TranzX dropper post so you won’t have any issues staying comfortable during long rides.

To top off all these features it also comes in weighing only 34.5lbs, not too shabby for an all aluminum full suspension mountain bike!

To conclude our review of the Trek Fuel EX 8 Gen 6 2023 – it’s definitely worth considering if you’re looking for a reliable trail bike that keeps up with today’s ever changing technology.

Its lightweight frame paired with an efficient full-suspension system will deliver precise handling no matter what type of terrain you choose to explore; coupled with its quality components run by reliable Shimano drivetrains will allow for an unforgettable experience out on the trails.

Order online and have it shipped to your local dealer for final assembly!!

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Field Test: Trek Fuel EX - Evolution Underlined

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"I'm stoked"

"I think it's the best looking bike in it's price range, the fit works great for me, and the drivetrain is excellent."

"Ready to rumble"

"Has the chops to squeeze every last drop of fun from local park trails, plus the talent to conquer black diamond terrain on the weekends."

"Much more capable downhill than I would have ever imagined; then, when I finished a lap and turned around to pedal back up, I was pleasantly surprised by the comfort and efficiency of the Roscoe’s climbing position."

"5 out of 5"

"One of the best we've ever tried at this price. So fun and capable it makes boring trails interesting and difficult trails manageable. "

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