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  • Fuel EX 9.8
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It's right for you if...

You like going fast, getting rowdy, and clearing every obstacle on the first try. You want a single bike that can handle any trail, with high-quality parts, a carbon frame, and dialed suspension for everything from burly technical descents to single track and even endurance races.

The tech you get

A light and stiff full OCLV Mountain Carbon frame, 140mm FOX Performance 36 Float fork, 130mm of rear travel with a FOX Performance Float shock featuring Trek's exclusive RE:aktiv with Thru Shaft, and a 1x12 SRAM GX Eagle drivetrain. Plus, powerful Shimano SLX 4-piston hydraulic disc brakes, Tubeless Ready Bontrager Line Carbon 30 wheels with a 54-tooth Rapid Drive rear hub for quick engagement, a Bontrager Line Elite dropper post, and a Bontrager Line Pro OCLV Carbon handlebar. An internal storage compartment and Control Freak cable routing add to the bike's capability and sleek look.

The final word

Fuel EX 9.8 is the definitive mountain bike, and a great choice if you're going to invest in a single bike for all kinds of terrain. A full carbon frame, quality parts build, and advanced suspension make it an outstanding all-around mountain bike for endurance racing and ripping every kind of trail.

See it in action

favorite_borderWhy you'll love it

  1. This bike is light, fast, and capable of shredding any kind of trail whether you’re heading out for an afternoon session or miles of endurance riding
  2. RE:aktiv with Thru Shaft works faster than a normal shock, so it tracks the ground better and keeps you in control
  3. A sleek internal storage compartment gives you a versatile spot to stow tools and gear
  4. We expanded our size range to ensure a better fit for all riders. And, you get the fastest wheel that fits your frame: XS frames get 27.5˝ wheels, S frames get to choose between 27.5˝ or 29˝, and sizes M to XL get 29˝ wheels
  5. Make it yours: it's customizable through Project One

"A world-class trail bike"

"Fuel EX is a beautifully balanced and capable trail bike. The rear suspension is beautiful; as close to ideal as any bike I've ridden. It's sensitive where you want it to be, firm and crisp where it should be. It feels deep and controls big hits very well, and there's a nice platform for pedaling, and to pump and pop off when you're playing."

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"Good at pleasing everybody"

"Fuel EX has a few tricks that help it keep a level head when outside of its comfort zone, and to be a cloud on rails when it's in the zone. Everything about the Fuel EX, which was already good at pleasing everybody, is now even better at it."

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"An absolute trail rocket"

"Thanks to its burlier components, increased travel, and more aggressive geometry, it has become more of a shredder than ever! More performance, fun, and trail prowess."

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Features

Will my bike have a curved top tube?

Will my bike have a curved top tube?

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

Active Braking Pivot

Active Braking Pivot

Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

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Suspension Calculator

Suspension Calculator

This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.

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Complete Tubeless System

Complete Tubeless System

Tubeless Ready rims and tires make it easy to ditch the tubes so you get better traction, fewer flats, and less weight. You're ready to roll right out of the box with the included TLR rim strips, valves, and sealant.

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Carbon Care Wheel Loyalty Program

Carbon Care Wheel Loyalty Program

Every set of Bontrager carbon wheels is backed by the Carbon Care Wheel Loyalty Program. In the unlikely event that you damage your Bontrager carbon wheels within the first two years of ownership, we’ll repair or replace them for free.

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Mino Link adjustable geometry

Mino Link adjustable geometry

Fine tune head tube angle by 1/2° and BB height by up to 10mm with the simple turn of a nut. Just flip the link to choose between slack or slacker geometry, without negatively affecting suspension performance. A Trek exclusive.

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Warrantied for life

Warrantied for life

Carbon wheels can give your ride an instant upgrade in speed and handling—and when you choose Bontrager, your investment is protected. All Bontrager carbon wheels are backed by a lifetime warranty for the original owner.

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Control Freak Cable Management

Control Freak Cable Management

The lightest, quietest, most versatile cable management system allows any combination of shift, brake, lockout, and dropper post lines to be routed through the frame for clean looks and the ultimate custom setup.

Specifications

*spec applies to all sizes unless otherwise noted

Frameset
Fork Fox Performance 36, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel
Shock Fox Performance Float EVOL, RE:aktiv with Thru Shaft 3-position damper, tuned by Trek Suspension Lab, 210x52.5mm
Max compatible fork travel 150mm
Wheels
Front wheel Bontrager Line Carbon 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle
Rear wheel Bontrager Line Carbon 30, Tubeless Ready, 54T Rapid Drive, 6-bolt, SRAM XD driver, Boost148, 12mm thru axle
Rear skewer Bontrager Switch thru axle
Tire Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.60''
Tire part Bontrager TLR valve, 50mm
Rim strip Bontrager TLR
Max tire size 29x2.60"
Drivetrain
Shifter SRAM GX Eagle, 12 speed
Rear derailleur SRAM GX Eagle
Crank Truvativ Descendant 7k Eagle, DUB, 32T alloy ring, Boost (52mm chainline), 170mm length
Bottom bracket SRAM DUB, 92mm, PressFit
Cassette SRAM XG-1275 Eagle, 10-50, 12 speed
Chain SRAM GX Eagle, 12 speed
Max chainring size 34T
Components
Saddle Bontrager Arvada, austenite rails, 138mm width
Seatpost Bontrager Line Elite Dropper, 100mm travel, internal routing, 31.6mm, 340mm length
Handlebar Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
Grips Bontrager XR Trail Elite, alloy lock-on
Stem Bontrager Line Pro, 35mm, Knock Block, 0 degree, 40mm length
Headset Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom
Brake Shimano SLX M7120 4-piston hydraulic disc
Brake rotor Shimano RT66, 6-bolt, 180mm
Accessories
Bag Bontrager BITS Internal Frame Storage Bag
Weight
Weight M - 13.17 kg / 29.03 lbs (with TLR sealant, no tubes)
Weight limit This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.

 

Rider Height

Inseam

All measurements provided in cm unless otherwise noted.

Frame size number Frame size letter Geometry position Wheel size A — Seat tube B — Seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack
13.5 XS High 27.5" 35.5 75.5° 9.0 66.5° 54.5 34.1 1.4 43.5 4.3 10.7 111.9 70.0 40.0 55.9
13.5 XS Low 27.5" 35.6 75.0° 9.0 66.0° 55 33.5 2.1 43.7 4.3 11.1 112.0 69.5 39.5 56.3
15.5 S High 27.5" 35.5 75.5° 10.0 66.5° 56.7 34.1 1.4 43.5 4.3 10.8 114.3 70.7 42.0 56.8
15.5 S Low 27.5" 39.5 75.0° 10.0 66.0° 56.8 33.5 2.1 43.7 4.3 11.1 114.4 70.2 41.5 57.2
15.5 S High 29" 39.5 75.5° 10.0 66.5° 57.7 34.6 2.8 43.5 4.3 11.5 115.3 70.7 42.0 60.5
15.5 S Low 29" 39.5 75.0° 10.0 66.0° 57.8 33.9 3.4 43.7 4.3 11.9 115.4 70.2 41.5 60.8
17.5 M High 29" 42.0 75.5° 10.0 66.5° 60.2 34.6 2.8 43.5 4.3 11.6 117.8 74.7 44.5 60.5
17.5 M Low 29" 42.0 75.0° 10.0 66.0° 60.3 33.9 3.4 43.7 4.3 11.9 117.9 74.1 44.0 60.8
18.5 ML High 29" 43.5 75.5° 10.5 66.5° 61.8 34.6 2.7 43.5 4.3 11.6 119.5 75.2 46.0 60.9
18.5 ML Low 29" 43.5 75.0° 10.5 66.0° 61.9 33.9 3.4 43.7 4.3 11.9 119.6 74.6 45.5 61.3
19.5 L High 29" 45.0 75.5° 10.5 66.5° 63.3 34.6 2.7 43.5 4.3 11.6 121.0 75.4 47.5 60.9
19.5 L Low 29" 45.0 75.0° 10.5 66.0° 63.4 33.9 3.4 43.7 4.3 11.9 121.1 74.8 47.0 61.3
21.5 XL High 29" 50.0 75.5° 12.0 66.5° 66.1 34.6 2.7 43.5 4.3 11.6 124.1 77.6 50.0 62.3
21.5 XL Low 29" 50.0 75.0° 12.0 66.0° 66.3 33.9 3.4 43.7 4.3 11.9 124.2 77.0 49.5 62.7

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