trek fuel ex 9 2016 geometry

2016 Trek Fuel EX 9 29 (discontinued)

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Reviewed by AJ Barlas and Fred Robinson // Photos by Lear Miller

Trek's Fuel EX range of bikes are aimed at the honest trail rider - those looking for a quality, fun bike that can handle a good variety of trails, but not necessarily something for super rowdy terrain. We previously tested the Fuel EX 27.5 , so it was fun to jump aboard the bigger wheeled brother and see how it compared.

For 2016, the Fuel EX 29 sees several changes for the better - it's slacker, offers adjustable geometry, has shorter chainstays thanks to the new Boost rear axle standard, and the rear shock has been updated to no longer feature Trek's DRCV. This was one of the only bikes in the 2016 Vital MTB Test Sessions with Boost spacing front and rear, but does it make a difference? Did the new RE:aktiv damper improve performance over a regular shock? Read on to find out.

• Aluminum frame
• 29-inch wheels
• 120mm (4.7-inches) of rear wheel travel // 130mm (5.1-inches) fork travel
• Full Floater suspension with Active Braking Pivot (ABP)
• RE:aktiv shock damping technology
• Tapered headtube
• External brake routing, internal cable routing, internal seatpost routing
• Adjustable geometry via Mino Link flip chips
• PF92 bottom bracket with ISCG05 mounts
• Boost 110mm fork axle spacing
• Boost 148mm rear spacing with 12mm through axle
• Measured weight (size 19.5, no pedals): 28.6-pounds (13.0kg)
• MSRP $4,000 USD

The Fuel EX 9 29 comes with a handful of unique features, and is highlighted by the RE:aktiv damper technology. Trek worked with motorsports specialists Penske Racing Shocks and FOX to create a shock with regressive damping. In a race car application, regressive damping is designed to be firm when cornering but supple for sudden impacts. When applied to mountain bikes the goal is similar - to provide support when pedaling or pumping but open up when needed.

Most rider inputs create low shaft speeds, while bumps create higher shaft speeds. Inside the shock, the main piston is equipped with a special spring loaded valve. The faster the shaft speed, the more the valve opens up and the more oil is allowed to flow through. Trek says the valve is capable of delivering lots of low-speed compression damping, fluid high-speed compression damping, and an instant, seamless transition between the two. Because of this Trek says RE:aktiv achieves what inertia valves have been unsuccessfully attempting for years by balancing pedaling performance with big-hit absorption without feeling harsh. The way it’s able to react so rapidly is by changing the surface area that the oil is pushing against .

The shock's abilities are most apparent in the "Climb" or "Trail" compression settings as the bike remains quiet during pedaling, but still allows the suspension to move due to ground impacts. This translates to the rear wheel moving out of the way while the rider continues to put power down. How it functions is really quite amazing, but it has its limitations and we’ve found that there is a time and a place for its use, much like any of the regular pedal platform adjustments on all rear shocks.

The spring curve of FOX’s relatively new Float EVOL (extra volume) shock closely matches the linear curve Trek previously relied on DRCV to provide, so DRCV gets the boot this time around. The shock is still proprietary due to its odd 184x48mm (7.25x1.875-inch) dimensions and RE:aktiv damper, however. To get that 120mm of travel, Trek's Full Floater suspension design actuates the shock from both ends with a one piece magnesium EVO Link on top and a concentric pivot at the rear axle known as ABP.

Boost is the other unique-ish technology that higher end Fuel EX 29 models include. We say unique-ish only because it's not commonplace yet. Boost was originally aimed to create stiffer 29-inch wheels without having to throw down the extra coin for carbon hoops. This was achieved by moving both rear hub flanges 3mm out from the center, resulting in a new 148mm axle width. Wider spacing gives the spokes a greater bracing angle, which in turn generates a stiffer wheel. This slight change also provided better tire clearance, which means that they can run slightly shorter chainstays. The front wheel also includes Boost, which takes the hub width from 100mm up to 110mm for similar results.

Additional features include room for a water bottle inside the front triangle, a PF92 bottom bracket, ISCG05 tabs, close to 19mm (0.75-inches) of mud clearance with the stock tires, optional direct front derailleur mount, and a fork with a custom 51mm offset. Aside from the stealth dropper post and rear derailleur cable (which is held taught in the frame), routing is external on the Fuel EX 9 29, which makes for easy service with no rattle. You'll find a large downtube guard for stray rock protection, but consider adding some extra protection to the stays for chainslap.

Trek offers the Fuel EX 29 in four aluminum complete builds ranging from $1,990 to $4,000 USD, two carbon builds at $5,300 and $8,400, and as a carbon frame for $3,300. There's also the option to build a fully custom bike through Trek's Project One program . Fuel EX 8 29 and above benefit from Boost, while the Fuel EX 7 and 5 29 retain 2015’s frame with standard hub spacing. We tested the $4,000 aluminum Fuel EX 9 29, which has an extra 10mm of fork travel (130 vs 120mm) over the other models.

2016 brings Trek's adjustable geometry feature to the Fuel EX 29 lineup via the Mino Link flip chips near the top of the seatstays. The geometry chart above shows numbers in the "low" setting with the option to steepen the head angle to 69.4-degrees and raise the bottom bracket by 8mm (0.3-inches). We measured our test bike bottom bracket height at 340mm (13.4-inches) in the low setting, so it's possible that the listed geometry is with a shorter travel 120mm travel fork. While slacker than the previous Fuel EX 29, at ~68.8-degrees this bike is a degree or so steeper than many other recent short travel 29ers. Thanks to Boost, Trek was able to drastically shorten the chainstays from 452mm to a much more nimble 436mm (17.2-inches), which is par for the course among comparable bikes. As you can see, it comes in several sizes to suit just about any rider.

On The Trail

Setup was a breeze thanks to Trek's suspension calculator , which provides a great starting point for air pressure and rebound. In the open "Descend" compression setting, we found the rear end to be more active during seated and standing pedaling efforts than similar bikes ridden during Test Sessions . Smooth climbs consisting of mellow to considerable grades with the occasional small rock feature saw the bike exhibit a good, nimble, and lively attitude. The bike is more enjoyable ascending than the Transition Smuggler thanks to a more energetic, positive demeanor. It’s more sporty than the static weight would suggest, and there were minimal issues with pedal strikes. Once the compression dial was set to the medium "Trail" setting, however, the beauty of the RE:aktiv damper really showed through.

In the medium compression setting the suspension was remarkably quiet as the RE:aktiv damper stepped in to allow for more power to the floor during climbs, but still provided plenty of traction on the dry, abrasive conditions of South Mountain's trails in Phoenix, Arizona. In this setting the bike required less energy to move up the hill. Climbing up rocky, stepped technical sections the bike had a great balance of control, moving through its travel smoothly while offering support, and notably missing harsh feedback that would result in it getting hung up on square edge features. It also helped with the bike's geometry, sitting a little higher in its travel, effectively resulting in a steeper dynamic seat tube angle.

Going to the firmest "Climb" mode was too much of an extreme when climbing rough sections, however, as it lost a lot of traction on relatively average grades with rough-ish patches. On smoother road climbs it was great to have it locked out, though, with minimal suspension movement while practicing good pedal technique.

Overall, we found the Trek Fuel EX 29 to be an above average climber. It's not a snappy XC style ascender, but is spirited enough and assists the rider rather than feeling like a dead sail. It is by no means a race bike out of corners or up moderate pitches, but does climb reasonably well with the stock 32-tooth chainring. If you're inclined, the bike will provide better antisquat traits with a smaller chainring.

Even with a swapped out 50mm stem, we felt as though the cockpit on the size 19.5 bike we tested was a little long while seated. The reach, on the other hand, was a little short - this is predominantly due to a slack 67-degree actual seat tube angle. On moderate to steep punches we found it a bit difficult to get up over the front end while in the saddle, and would wind up riding way up the nose of the seat in order to compensate. Moving the seat forward on the rails helped with this as well.

The 50mm replacement stem took place of the stock 70mm Bontrager Rhythm Comp. We should also mention that the Bontrager Race Lite 750mm (29.5-inch) wide bars were swapped out for something a tad wider. These changes created a more comfortable setup for how we prefer to ride. Even so, a steeper seat tube would result in it climbing more favorably, especially on steep technical grinds.

While descending smoother, lower grades with the compression lever set to Trail, the bike responded well to rider input and zipped along at a solid pace when exiting corners or putting a few pedal strokes in to get back up to pace. In this setting it tracked reasonably well in loose over hard conditions, though it was easier to break loose under aggressive cornering. High speed descents and g-outs often overwhelmed Trail mode during descents, however, so flipping dials is a must do to get the most out of the bike.

On the same type of trails with the compression wide open the bike was much more willing to being pushed hard into corners, garnering increased traction but losing some of the sporty attitude exhibited in the medium compression mode. This resulted in more required rider input and planning in order to pick up over obstacles and square edges.

Getting up to speed in rough terrain we noticed the suspension tracks well through all types of smaller hits. The bike comes out of deep compressions well and has a nice bottomless feel without feeling harsh. We never really felt the end of the travel despite using the full amount many times, even though there are no volume spacers in the shock from the factory.

During successive high speed hits it never packed up or felt like it was hanging up. However, the Fuel EX didn't exhibit the same level of confidence inspiring stability that we found with the Transition Smuggler or Evil Following, with the Fuel EX requiring an extra level of rider guidance in order to keep the bike on line. In fact, due to its tendency to wander we had a couple of "moments" in parts of the trail where the Transition and Evil would just motor along comfortably. In rough conditions the bike feels deceptively tall despite running some similar numbers to its competitors. The suspension didn’t give what we would describe as a planted ride, and due to its softer, more active, and lively nature it preferred to be ridden with more of a playful attitude. One potential way to boost the bike's overall stability in the rough would be to run a little more sag and add a volume spacer for a more progressive but deeper feel.

Here's the suspension in action:

Regarding the Boost wheels, after a few days of good hacking the rear wheel eventually lost some spoke tension, and any half decent hit or hard corner would result in horrible noises coming from the rear wheel flexing. As such, we were unable to truly discern any benefits to the wider system at that time. It should be noted though, that it's is fairly typical of a new wheelset to require some attention after initial break-in. Our second tester got to ride the bike after we had adjusted the spoke tension and felt the wheels went unnoticed, essentially performing as they should and feeling similar to that of a well trued, solid 650b wheelset. The frame was stout, too. In short, Boost works, but only when the wheels are properly tensioned.

Trek’s $4,000 Fuel EX 9 29 model is pretty competitively priced, though four grand can go a long ways with other "consumer direct" brands, especially when you consider the components. Even so, this bike comes ready to rally with solid FOX suspension front and rear, a SRAM Roam 30 wheelset, trustworthy Shimano XT brakes with dual 180mm rotors, a RockShox Reverb Stealth 125mm dropper, and a reliable SRAM X1 1x11 drivetrain.

The 130mm travel FOX Performance 34 Float fork provided a stable ride with minimal adjustments, and the suspension giant seems to have moved away from the issues that plagued them a couple seasons ago. The fork used its travel well while offering a good amount of support. It never felt overly active and was generally quieter than the rear of the bike.

For the terrain we were riding, we would swap out the stock 2.3-inch tubeless Bontrager XR3 Expert tires for something with a bit more meat. While the XR3 tires were okay, they didn’t inspire a great amount of confidence in loose over hard corners and their lightweight sidewalls added to the bike's instability in high speed chunder. That said, these were one of the only thinner sidewalled tires to not experience a puncture during Test Sessions, so that's a plus.

Aside from the rear wheel not having proper spoke tension when we first hopped on the bike, the SRAM Roam wheels were solid. After tightening up the spokes our second tester was able to get on without any of the annoying, sketchy sounding flex observed during the first tester's rides, and went on to note that the wheels felt inline with a sturdy set of 650b wheels as claimed. At the end of our test the rear wheel was only slightly out of true.

As mentioned above, we swapped out the somewhat narrow low-rise bars and longish stem for something that better suited the descents, but realize that these cockpit choices are a personal preference. The supplied grips were not the most comfortable either, with a very thin, hard rubber that felt pretty harsh on rough trails.

Long Term Durability

Outside of regular maintenance like tires, brake pads, and checking the spoke tension of the wheels, the Trek Fuel EX 9 29 appears ready to go the extra mile. Thanks to some clever cable routing we don’t foresee any issues from excessive rub, and given the rest of the decent quality components and good construction there is no reason to be concerned with the long term durability of the bike.

Towards the end of our last ride we did notice a creak developing in the pivot located just above the bottom bracket. Simply snugging up the hardware resolved the issue.

Trek backs the frame with a lifetime warranty, though there is a five year condition on the swing arm and one year on paint and decals.

What's The Bottom Line?

Trek’s Fuel EX 9 29 is a good value with some serious suspension technology that only adds to the fun times provided by a short travel 29er. You've got to be willing to flip some levers mid-ride to really see what it's capable of, so "set it and forget it" riders may not appreciate all the bike has to offer. The ride's conservative geometry works well on a range of terrain and features, and though the bike doesn’t really nail either the climbs or the descents, it’s a solid all-around steed. While very lively and active, it lacks a super confidence inspiring ride when things get truly wild. Some minor suspension tweaks and a burlier set of rubber could make it a more stable descender.

Visit www.trekbikes.com for more details.

Vital MTB Rating

• Climbing: 4 stars - Excellent
• Descending: 3 stars - Good
• Fun Factor: 3.5 stars - Very Good
• Value: 4 stars - Excellent
• Overall Impression: 4 stars - Excellent

Bonus Gallery: 23 photos of the 2016 Trek Fuel EX 9 29 up close and in action

About the reviewers.

Fred Robinson - Age: 31 // Years Riding MTB: 13 // Height: 6'1" (1.85m) // Weight: 240-pounds (108.9kg)

"Drop my heels and go." Fred has been on two wheels since he was two years old, is deceptively quick for a bigger guy, and likes steep, fast trails where he can hang it off the back of the bike. Several years of shop experience means he's not afraid to tinker. He's very particular when it comes to a bike's suspension performance and stiffness traits.

AJ Barlas - Age: 35 // Years Riding MTB: 15+ // Height: 6'3" (1.91m) // Weight: 165-pounds (74.8kg)

"Smooth and fluid." Hailing from Squamish, BC, AJ's preferred terrain is chunky, twisty trail with natural features. He's picky with equipment and has built a strong understanding of what works well and why by riding a large number of different parts and bikes. Observant, mechanically inclined, and always looking to learn more through new experiences and products.

Which reviewer resembles you the most? Don't miss our Q&A with the testers for more insight about their styles and preferences.

About Test Sessions

Four years ago Vital MTB set out to bring you the most honest, unbiased reviews you'll find anywhere. That tradition continues today as we ride 2016's most exciting trail, all-mountain, and enduro bikes in Phoenix, Arizona. Reviews can be accessed 24/7 in our Product Guide . Test Sessions was made possible with the help of Rage Cycles . Tester gear provided by Troy Lee Designs , Royal Racing , Smith , Fox Racing , Race Face , Easton , and Source .

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Trek Fuel EX 9.8 29

• AUS $ NZD $ USD $ CAD $ GBP £ EUR €

Colour / Powder Blue

Size / 15.5, 17.5, 18.5, 19.5, 21.5, 23"

At a glance

Where to buy.

Specifications

• Frame OCLV Mountain Carbon main frame & seatstay, alloy chainstay, ABP, Boost148, Full Floater, EVO link, E2 tapered head tube, Mino Link, Micro Truss, Control Freak internal routing, Carbon Armor, PF92, ISCG 05, G2 Geometry, 120mm travel
• Wheels DT Swiss M1900, tubeless strips & valves, Boost110 front, Boost148 rear
• Wheel Size 29"
• Tires Bontrager XR3 Team Issue, Tubeless Ready, 120tpi, aramid bead, 29x2.30"
• Crank Shimano Deore XT, 36/26
• Front Derailleur Shimano Deore XT, high direct mount
• Rear Derailleur Shimano Deore XT, Shadow Plus
• Shifters Shimano Deore XT, 11 speed
• Brakeset Shimano Deore XT hydraulic disc
• Handlebar Bontrager Rhythm Pro, OCLV Carbon, 31.8mm, 15mm rise
• Saddle Bontrager Evoke 3, hollow titanium rails
• Seatpost RockShox Reverb Stealth, 2-bolt head, 31.6mm, zero offset
• Stem Bontrager Rhythm Pro, 31.8mm, 0 degree
• Headset FSA IS-2 carbon, E2, sealed alloy cartridge

Q: What size wheels does the 2016 Trek Fuel EX 9.8 29 have?

The 2016 Trek Fuel EX 9.8 29 has 29" wheels.

Q: What size 2016 Trek Fuel EX 9.8 29 should I get?

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• Fuel EX 9.8 29

Review: Trek Fuel EX 9 29

by Wil Barrett March 14, 2017 0

Rewind to Issue #110 of Singletrack Magazine for our review of the Trek Fuel EX as part of the Big Names bike test.

Originally launched in 2005, the Fuel EX first emerged as a more practical version of the Top Fuel race bike, with 100mm of front & rear suspension and an upright riding position. In recent years however, the Fuel EX has grown longer and musclier legs. Just like the Specialized Camber, the Fuel EX has slowly gravitated away from its XC roots, adopting modern technologies and drawing from the bigger travel Remedy to produce a more technically competent trail bike.

For 2017, the Fuel EX has been redesigned yet again. The new version is equipped with 130mm of travel front and rear, along with beefier tubing and slacker geometry. It’s available in both alloy and carbon frame options, and you can get it with either 29in or 27.5+ wheels. The frame is actually the same between the two, but a 140mm travel fork is utilised on the plus models.

To increase frame stiffness, Trek has employed a huge downtube that takes a relatively direct route from the tapered head tube to the PF92 bottom bracket shell. Along with the Boost thru-axles and hydroformed tube profiles, Trek claims the new Fuel EX 29 is almost as stiff as the long-travel Slash 27.5.

To prevent the fork crown from smashing into the straight downtube, a keyed headset has been used to limit handlebar rotation. Called the Knock Block, the special upper headset locks into the spacers and the stem to act as a single unit. Should the replaceable frame chip breakaway in the event of a heavy OTB experience, a rubber bumper behind the head tube acts as a secondary line of defence.

Out back you’ll find Trek’s ABP suspension design, which uses a concentric pivot around the rear axle, and a floating mount for the Fox rear shock. Gone is the DRCV shock from previous Fuel EX models, and in its place is a more conventional Fox EVOL air can equipped with Trek’s RE:aktiv damper.

The Fuel EX 9 comes decorated with parts from Trek’s in-house brand, Bontrager. That includes the new Drop Line internally-routed seat post, and 30mm wide Line Comp 30 wheels. These come with tubeless rim strips preinstalled, so all you need to buy is a pair of tubeless valves and some sealant, and you can ditch the inner tubes from the XR3 tyres.

Out of the box, the Fuel EX required very little fettling. Trek has a handy suspension setup calculator available on its website, and to my surprise, the recommended settings for my weight were absolutely spot-on. Likewise, I only needed to drop the stem by one spacer and the fit felt comfortable straight away. Less fettling, more riding.

There are six frame sizes available in the Fuel EX, so instead of lobbing yourself into the usual Small, Medium or Large categories, choose a size based on the reach measurement. I went with the 450mm reach of the 18.5in size, which (confusingly) actually has a 17.5in long seat tube.

With 25% sag in the rear shock, and 20% sag in the fork, the Fuel EX feels buttery smooth on the trail. In the Open mode, the small-bump compliance rivals much longer-travel machines, dissipating surface irregularities with aplomb. Part of this sensitivity is the Full Floater linkage at work, but a lot of it also has to do with the large negative spring in the EVOL air can, which helps to ease the shock into its travel.

As the longest travel bike on test, the Fuel EX is also the heaviest. The weighty wheelset is most noticeable on longer uphill stretches, with the Fuel EX lacking the zip that the Giant Anthem exudes. On the other side of the coin, it’s a bike that you can properly monster truck on the descents, with a deep and bottomless feel to the suspension. Just let off the brakes, point the front wheel, and charge into whatever comes your way.

For added stability, the Mino Link can be flipped into the Low setting, which lowers the BB height and gives you a 66.5-degree head angle. In this setting, the Fuel EX is the only bike here that I’d feel comfortable lining up at a local enduro race with.

For most trail riding endeavours though, I actually preferred the added agility of the High setting with its 67.2-degree head angle and increased pedal clearance. Running the shock in the Medium position also helped to keep the shock riding higher in its stroke for technical climbing, with the RE:aktiv damper allowing for an impressively fast breakaway threshold.

Unfortunately the seat post started to feel gritty after the first few rides, requiring significant force to compress. We also have two other Drop Line seatposts on test at the moment that are suffering from the same issue. Apparently some of the posts aren’t sufficiently greased up from the factory, and a bit of Pennine paste and water ingress is enough to cause issues with the main seal. The fix is a relatively easy strip down and clean, while packing the post with extra lithium grease in the process – your local Trek dealer will be your point of call if you encounter the same issue we did. That said, expect more routine maintenance if you ride in wet conditions regularly.

And while the internal cable routing looks clean, I found the cables rattled around in the downtube regardless. Likewise, the rubber frame armour is appreciated, but I wish they were bolt-on shields like what Specialized uses.

The latest Fuel EX is without doubt the most capable trail bike that Trek has ever produced. With a stiffer chassis, tight chainstays and low-slung geometry, it’s a thoroughly modern 29er that features a level of pop and playfulness that many riders wouldn’t associate with a big wheeler.

The beauty of the Fuel EX though, is that it manages this agility in a package with plush suspension and high-volume rubber that means you can dump it into rocky blown-out singletrack, and come out the other side unscathed. While it may have swung too far away from its XC roots for some riders, for growing your confidence and skills set, the Fuel EX is an ideal trail companion.

2017 Trek Fuel EX 9 29 Specifications

• Frame // Alpha Platinum Alloy, 130mm Travel
• Fork // Fox 34 Float Performance, 130mm Travel, Tapered, QR15
• Shock // Fox Float DPS Performance, EVOL, RE:aktiv Damper
• Hubs // Bontrager Line Comp 30, 110x15mm Front & 148x12mm Rear
• Rims // Bontrager Line Comp 30, 29in, 28H
• Tyres // Bontrager XR3 Expert 2.40in, Inner Strength Casing
• Chainset // SRAM X1 1200, 32t Chainring
• Rear Mech // SRAM X1, 11-Speed
• Front Mech // N/A
• Shifters // SRAM X1, 11-Speed
• Brakes // SRAM Guide RS, 180/160mm Centreline Rotors
• Stem // Bontrager Line, Knock Block, 60mm, 0-degree
• Bars // Bontrager Line, 750mm Wide, 15mm Rise, 9×4-Degree
• Grips // Bontrager RL Lock-On
• Seatpost // Bontrager Drop Line, 125mm Travel, 30.9mm
• Saddle // Bontrager Evoke 2
• Size Tested // 18.5in
• Sizes available // 15.5in, 17.5in, 18.5in, 19.5in, 21.5in, 23in
• Weight // 13.55kg (29.81lbs)

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Trek Fuel EX 9.7 review | Trail Bike of the Year contender

Trek’s hyper-adjustable trail bike is built to do it all

Excellent chassis; spot-on geometry; great suspension; lovely ride feel; super-capable and adjustable

Poor brakes; tyres can’t compete with the competition

The Trek Fuel EX 9.7 Gen 6 sits around the middle of Trek’s aggro trail bike range, with this version sporting a carbon frame.

It is, as far as I can tell, one of the most adjustable mainstream trail bikes on the market, with a plethora of geometry-adjustment capabilities, as well as the ability to tune the suspension further than the shock alone allows.

Add in a couple of wheel-size options on the smaller-sized bikes and it's hard to think up a rider profile who wouldn’t get on with the bike.

That’s all based on the tech specs, though, and what’s important is how this 140mm-travel rig rides.

As I found when I tested the alloy Fuel EX last year, it’s a solid platform, with excellent ride characteristics and plenty of positives.

It’s highly maneuverable and easy to ride without any odd quirks, while the suspension works well on hits small and large.

However, at RRP, the value isn’t amazing, and Bontrager’s tyres struggle against competition from Maxxis , lacking their grip and feel.

Trek Fuel EX 9.7 frame and suspension

Trek’s nomenclature dictates that a 9.something-named bike has a carbon frame . Here, you get the brand's OCLV Mountain Carbon throughout, save for the magnesium rocker link.

The frame features are well thought-out, with plenty of protection from rock strikes, as well as internal storage, neatly wrapped up in the supplied bag. This sits in a lever-locked door under the frame’s bottle cage in the down tube.

Cables are guided through the frame in sleeves from the head tube, while the use of a 34.9mm seat tube means broad-diameter droppers can be used for, theoretically, increased durability.

ISCG mounts surround a threaded bottom bracket.

Specific suspension

Trek builds the frame around its ABP (Active Braking Pivot) linkage. This features a rear pivot concentric to the rear axle, marking it out from the usual four-bar or faux-bar linkages, whereby the rear pivot sits in the chainstay or seatstay respectively.

Trek claims this better separates forces from braking and pedalling from the suspension.

While most riders will likely stick with the air shock supplied, the frame is compatible with coil shocks . This is partly thanks to the More/Less chip that lives at the bottom of the shock.

This adds (More) or reduces (Less) the progressivity of the leverage curve, making it more or less progressive.

This can be flipped with the stock shock in place, but the Less position is most suited to air shocks, which naturally have more ‘ramp-up’ later in their stroke. The More position is suited to coil shocks, which are linear throughout their stroke (unless you have a fancy progressive spring or shock).

Trek Fuel EX 9.7 geometry

Much like the suspension, there’s plenty of adjustability on offer when it comes to the geometry of the Fuel EX.

There is a Mino Link chip at the top of the seatstays, which is pretty traditional in nature. This alters the head and seat angles by 0.5 degrees, as well as the BB height by 8mm.

There’s also the ability to swap the headset cups. These are available aftermarket and allow for a range of 2 degrees of head-angle change – one degree either side of the ‘Neutral’ setting the bike comes with as stock.

Though there will be slight changes in BB height and seat tube angle, it’s effectively pretty independent of these.

Then, there are wheel sizes to consider.

The XS comes with 27.5in wheels, S-sized bikes can be purchased with either 27.5in or 29in wheels, while M, ML, L, XL and XXL come with 29in wheels, but can also be run as mullet setups . Phew.

With such an extensive set of options, the below geometry chart is representative of how I ran the bike the bulk of the time – Neutral headset cup, Low Mino Link, 29in hoops.

Here, a Large has a long 485mm reach, short 435mm seat tube, steep 77-degree seat tube angle (though I measured mine at 78 degrees, with a 750mm saddle height) and slack 64.5-degree head angle.

The chainstays are 440mm on a Large, but are size-specific, ranging from 435mm to 450mm.

Clearly, Trek’s engineers have been busy.

Trek Fuel EX 9.7 specifications

With the carbon construction accounting for much of the £4,175 price, the spec list isn’t necessarily as flashy as some in the 2024 Trail Bike of the Year list. However, it’s all solid kit and doesn’t, on paper, give anything to be concerned about.

The suspension is provided by Fox, with a 150mm 36 Rhythm featuring a basic GRIP damper. At the back, a Performance-level Float X shock has a piggy-back construction, boosting oil volumes, which should help with consistency on long descents. It has a two-position lockout lever.

Shimano supplies Deore, SLX and XT running gear, while SRAM’s DB8 brakes haul on 200mm/180mm rotors.

Trek’s Bontrager brand supplies the alloy Line Comp wheels and XR5 Team Issue tyres, as well as most of the finishing kit. Droppers come from TranzX, in 100-170mm lengths, depending on frame size.

All combined, this trail-ready bike comes in at a shade under 15.4kg.

Trek Fuel EX 9.7 ride impressions

With relatively little adjustability, setting up the fork and shock is easy. It's nominally a case of setting sag and adding the required rebound clicks – in my case two from fully open in the fork and three from fully open in the shock.

My tyre pressures depend on the conditions I’m riding in, but my baseline is 22psi in the rear and 21psi in the front, from which I then experiment.

Trek Fuel EX 9.7 climbing performance

The Fuel EX offers few excuses on the climbs.

The suspension is stable, rarely bobbing in its travel as you pedal, ensuring the majority of your effort is channelled into getting you to the top of the hill.

On lumpier climbs, this means a few more of those bumps and edges are fed through to you, but the stability is much appreciated on steep climbs and long drags alike.

Don’t equate stability with a lack of suppleness, though, because there’s still enough freedom of movement to enable the tyres to find grip.

On tarmac sections, the shock’s lockout lever is within easy reach, for even perkier climbing, and you can easily twist the dial on top of the 36 Rhythm fork to lock that out, too.

The climbing performance is boosted by the geometry. The seat angle is steep, putting your hips in an efficient position over the cranks, while the 440mm chainstays (Large) balance the lengthy front end nicely, ensuring your weight is distributed well between the axles.

When things get steep, it doesn’t settle deep into its travel, maintaining those angles nicely.

Bontrager’s hubs have a very low engagement angle of just over 3 degrees, which makes ratcheting up and through techy lines much easier than a gappier freehub .

The tyres also contribute. Their low block height reduces rolling resistance, speeding up your ascent.

On loose, muddy climbs, though, the tread blocks don’t dig in as well as chunkier rubber. Their relatively hard compound also doesn’t ‘stick’ to rocks and roots as well as the best compounds from other tyre brands.

If steep, techy climbs are your thing and you want a more upright bike, the geometry adjust settings will help you get a more perky feel that's even better suited to navigating complicated terrain.

Trek Fuel EX 9.7 descending performance

The overriding feeling from the Fuel EX is one of composed calmness.

The chassis is robust and largely unshakeable on all grades of trail, whether you’re pummelling through rocks or loading it up through berms.

The rear shock smooths the way effectively, keeping the rear wheel locked to the ground, even when you’re on the brakes.

The damping in the shock mirrors the calmness of the bike. It has a steadfast calmness, rather than a hyperactive feel.

It does a good job of dealing with mid-sized impacts, although there are bikes out there that will offer an even smoother ride – there’s still a communicative feel as you traverse technical tracks.

Hit something big and the bike transitions to the depths of its suspension in a controlled manner, avoiding any harsh bottom-outs and ensuring you remain nicely in control.

The Fuel EX is happy being pumped through rollers, or pushed into the face of a jump, thanks to good mid-stroke support.

This gives it a more urgent feeling than some on more mellow terrain – only boosted by those faster-rolling tyres.

With excellent geometry and a stout frameset, the Fuel EX excels when weighted up through corners. While the shape is pretty long and slack, there’s still an agility that means you can make the most of tight and twisty tracks, thanks to the stubby stem, balanced shape and supportive suspension.

Pitch into a steeper section and the relatively low BB and generous length help give the Fuel EX an unshakeable feeling.

The 36 Rhythm is a fine fork, with the simple GRIP damper offering smooth and comfortable performance that aids the front wheels’s tracking of the ground and helps insulate you from the rough and tumble.

The chassis is sturdy, so it doesn’t choke when you’re battering it through rocks.

The most aggressive riders, though, will start to push its limits. The slight lack of mid-stroke support becomes noticeable, and the fork starts to use more of its travel than is necessary.

That said, you have to be really going some to get to that point.

By then, you’ll have noticed that Bontrager’s tyres don’t perform as well as the best mountain bike tyres .

Their rubber compound is less grippy, leading to a nervous feel on rocks and roots. This is exacerbated by a pingy carcass that skitters away from, rather than shrugs off, glancing blows.

Fortunately, The Line 30 alloy wheels the tyres are wrapped around are good.

They blend decent stiffness with comfort, while the fast pick-up of the rear hub makes accelerating out of corners a joy. As soon as you put some cranks in, the bike drives forward.

I tested the Fuel EX with wheels from another test bike, to see how it would perform with better rubber.

The improvement in grip from the Maxxis tyres was noticeable, enabling you to push the frame and fork further towards their limits, squeezing every drop of available performance out of them.

A more prominent shoulder tread, rather than the rounded profile of the SE5, improves cornering grip, while changing up the compound improves grip in marginal conditions.

I’d happily have this bike in my garage, though the tyres would be an early upgrade to help make the most of it.

I’d also make some alterations to the braking because the organic pads on the SRAM DB8s aren’t as good as the sintered options. My experience of the Marin Rift Zone 29 XR’s DB8 brakes with their HS2 rotors would inspire me to switch up the rotors on the Trek, too – the difference is palpable.

With better tyres and brakes from the off, the score would be higher, but you also have to take price into account. Though it has a carbon frame, the value for money at RRP isn’t great.

How does the Trek Fuel EX 9.7 compare to the Canyon Spectral CF7?

The Trek’s chassis is one of the best, offering tons of adjustment, a fantastic shape and a sturdy ride feel.

It is, however, considerably more expensive, at RRP, than the Canyon Spectral CF 7 (£3,299), which also has a carbon frame and a very similar spec list.

Both have fantastic geometry, and while the Canyon offers a smoother ride feel, the Fuel EX climbs better and has more urgency when generating speed.

The Canyon’s brakes and tyres are better – Shimano SLX and Maxxis Minions respectively – however, the Trek’s SRAM drivetrain is smoother if you’re maintenance-phobic.

Canyon has the advantage of a direct-sales model, which helps cut costs, although many will appreciate the access to test riding and servicing from a local shop with the Trek.

Trail Bike of the Year 2024 | How we tested

This bike was tested as part of my 2024 Trail Bike of the Year test. Around 20 bikes were long-listed, with eight models, ranging from £2,999 to £4,199, making it into the test.

The bikes were all tested over a period of three months, on a wide range of trails in the South West of the UK, ranging from trail centre pedals to bike park laps and woodland rallies.

The bikes were also all put through our workshop to measure angles, dig into frame details and make sure everything was running smoothly.

All bikes were base-line set up with 28 per cent sag at the rear, and 21psi in the front and 22psi in the rear tyre. The testing process helped fine-tune their setups to get the most out of the bikes, wherever they were being ridden.

Our Trail Bike of the Year contenders

• Whyte T-160 RS
• Canyon Spectral CF7
• Marin Rift Zone XR
• YT Jeffsy Core 3
• GT Sensor Carbon Pro
• Cannondale Habit LT 2
• Trek Fuel EX 9.7
• Scott Genius 940

Trek Fuel EX 9.7 bottom line

Trek’s carbon Fuel EX chassis is solid, adaptable and high-performing.

The blend of excellent geometry with sorted suspension makes it, in my eyes, one of the most desirable framesets on the market.

This model doesn’t represent the best value for money around, though, with the brakes and tyres in particular holding it back. Upgrade those and the Fuel EX 9.7 will be an absolute shredder.

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Bikeradar newsfeed, whyte t-160 rs review | trail bike of the year winner, marin rift zone xr 27.5 review, cannondale habit 3 review, cotic jeht silver mullet review.

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Flow’s First Bite: Trek Fuel 9.8 27.5 2016

The not-so-minor details.

Trek Fuel EX 9.8 27.5

Trek Bikes Australia

AUD5,599.00

A stiffer, neater version of a bike we already love.

Doesn't get the Mino Link upgrade found on the Fuel EX 29.

Our love affair over the years with Trek’s Fuel series has been a passionate, torrid and deep. We know the Fuel series like the back of our hand, having spent the past 12 months on board both the 29″ and 27.5″ versions of this bike as the steeds of choice for all our Flow Nation road trips.

For the new season, we’re incredibly happy to welcome the 2016 version of the Fuel EX 9.8 27.5 into the Flow stable. While the 29er version of the Fuel has been reworked in a big way, the 27.5 is not a radically different machine to last year’s bike. The frame remains the same as 2015, but there have been some excellent spec changes to add some junk to its trunk. Notably too, the rear shock no longer has the bulbous ‘knob’ of the DRCV chamber – more on that later.

Stiffer: Finally the Fuel comes with a fork which can match the bike’s abilities. The new FOX 34 series is a much sturdier number than the 32mm fork which came on the 2015 model. Combined with a wider bar (still only 720mm unfortunately, but that’s better than last year’s skinny 690mm bar) this should give the bike a much more direct feel up front.

DT wheels: Given how good Trek’s own in-house Bontrager wheels are, we’re surprised to see DT hoops on the Fuel 9.8 for 2016. They’re shod with the versatile Bontrager XR3 rubber, which sealed up tubeless perfectly. They should be a good set of wheels, though we may opt to run a more aggressive XR4 up front (our favourite rubber from Bonty).

Goodbye DRCV : The Trek/FOX DRCV shock, which used a twin chamber design, has been a consistent feature of the Fuel and Remedy series for the past few years, but for 2016 Trek have decided to move away from this proprietary shock design. Instead, they’re running the new large-volume FOX EVOL shock. Apparently Trek were able to obtain the same ride characteristics with the EVOL shock as they’d been seeking with the DRCV design, namely a more linear spring rate. To be honest, we’re happy to see DRCV phased out. We’ve always liked the ultra smooth performance of DRCV, but it did have a tendency to bottom out pretty hard when really pushed to the limit, and the easy serviceability of a ‘standard’ shock is a real plus.

The rear shock also has the RE:aktiv damping that was debuted last year. This ‘regressive’ damping system is designed to offer a firmer platform when the shock’s ProPedal is engaged, but with a faster, smoother transition into the shock stroke. While the system wasn’t without its bugs last year (a batch of shocks had a nasty ‘clunk’) it is a very effective damper, allowing you to run bike in a firmer compression setting without sacrificing sensitivity too much.

No Mino Link: While the new Fuel EX 29er is graced with Trek’s Mino Link geometry adjustment system, unfortunately this neat feature hasn’t been carried over to the 27.5″ bikes… yet. Hopefully it does get introduced down the track, as we’d love to have the option of slackening the Fuel’s head angle by half a degree.

XT all over: Shimano’s exceptional new XT 11-speed drivetrain and brakes get the nod. Read more about our experiences with XT’s newest incarnation here . It’s superb kit. We’ll likely be converting this bike to run a single ring, which is as simple as swapping out the chain ring.

This bike will be with us for the long haul now. Tomorrow we’ll take it for its maiden voyage on our home trails – we cannot wait!

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• Trek Fuel EX 9.8 29 2016

Bike summary

Bike components.

OCLV Mountain Carbon main frame & seatstay, alloy chainstay, ABP, Boost148, Full Floater, EVO link, E2 tapered head tube, Mino Link, Micro Truss, Control Freak internal routing, Carbon Armor, PF92, ISCG 05, G2 Geometry, 120mm travel

Rear Derailleur

Shimano Deore XT, Shadow Plus

Front Derailleur

Shimano Deore XT, high direct mount

Shift Levers

Shimano Deore XT, 11 speed

Shimano Deore XT, 11-40, 11 speed

Shimano Deore XT, 36/26

Bottom Bracket

BSA, 73mm, threaded

DT Swiss M1900, tubeless strips & valves, Boost110 front, Boost148 rear

Bontrager XR3 Team Issue, Tubeless Ready, 120tpi, aramid bead, 29x2.30"

Shimano Deore XT hydraulic disc

Bontrager Rhythm Pro, 31.8mm, 0 degree

Bontrager Rhythm Pro, OCLV Carbon, 31.8mm, 15mm rise

FSA IS-2 carbon, E2, sealed alloy cartridge

Bontrager Evoke 3, hollow titanium rails

RockShox Reverb Stealth, 2-bolt head, 31.6mm, zero offset

Bike geometry

Model overview.

Fuel EX 9.8 29 belongs to the Trek Fuel model. Trek released 277 bikes variations of this model so far. Check out the entire range from 2016 of this model, by clicking this link .

Take safety seriously when you ride your bike, and always wear your helmet. Moreover, don’t ride on the sidewalk. This is actually against the law in some states and can be dangerous for both you and pedestrians.

Average price for Trail bikes

According to our calculations, the average cost of a Trail bike that is reliable is 2762 $ . However, you could also get a good Trail bike even if you pay a lower amount than the average price. As a general rule of thumb, you should always read reviews about the bike and its components before buying it to ensure you don’t pay too much.

Internal Cable Routing

Another thing to mention, is the internal cable routing of this bike. In conclusion, this helps you too, keep the bike cables in mint condition, and also it looks better. No more cables, surrounding the bike.

Fuel EX 9.8 29 components

Bike rear shocks increase the riding comfort, and also give you more control over technical trails. To sum up, get a full-suspension bike if you want the smoothest rides.

The wheels on Fuel EX 9.8 29 are the 29″ aluminum type. These wheels are more forgiving when you go over roots, rocks, bumps, or other obstacles you encounter on your ride. However, these wheels are not ideal for smaller people.

For your safety, it is important to have quality breaks on your bike. Trek Fuel EX 9.8 29 has Hydraulic Disc brakes installed. Hydraulic disc brakes are perfect for mountain biking, road cycling, and commuting. To sum up, you can ride your bike with confidence.

Dropper post

Every bike should have a dropper post, and this one does. Therefore, climbing or descending will be a breeze.

Trek Fuel models from 2025

Trek fuel models from 2024, trek fuel models from 2023, trek fuel models from 2022, trek fuel models from 2021, trek fuel models from 2020, trek fuel models from 2019, trek fuel models from 2018, trek fuel models from 2017, trek fuel models from 2016, trek fuel models from 2015, trek fuel models from 2014, trek fuel models from 2013, trek fuel models from 2012, trek fuel models from 2011, trek fuel models from 2010, trek fuel models from 2009, trek fuel models from 2008, trek fuel models from 2007, trek fuel models from 2006, trek fuel models from 2005, trek fuel models from 2004, trek fuel models from 2003.

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• Rider Notes

2016 Trek Fuel EX 8 29

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

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A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Fuel EX 8 29

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Nov 2017 · Will Hilbert

Take a look at the new Fuel EX and you will quickly see Trek has fully redefined the model. The 2016 Fuel Ex 29 was a step in the right direction, but it was a timid half-hearted step that left the rider wondering what if…? What if it came spec’d with a stiffer fork, more travel and a slacker headtube? The team at Trek delivered and the 2017 bike answers these questions. It now allows the use of 29” or 27.5+ wheels and is one of the stiffest frames in the category, featuring a totally new geometry that’s slacker and longer than its predecessor.

Apr 2017 · Danny Milner

Trek’s venerable Fuel gets a high-octane boost in the form of Plus-size wheels with the Trek Fuel EX Plus 9.8 27.5. Beautiful to behold and a joy to ride.

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Mar 2017 · Wil Barrett

The Fuel EX is Trek's most popular full suspension bike. So, is the 2017 version the best yet? Wil gets stuck in to find out.

Earlier this year, the Fuel EX received rapid fire updates that first introduced a 27.5+ version then quickly made it the standard model by adding 29er wheels and tires for most of the stock builds. The frame was all new for both, bumping travel to 130mm, and it effectively did away with the standard 27.5 …

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Trek Fuel EX features new geometry, a new frame, and a revised spec. We’ll reveal whether Trek’s streamlining has been worth it.

We test out Trek's newly redesigned trail bike, the Trek Fuel EX 9.8 29 2017.

Last updated June 29 Not listed for 2,543 days

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