Fuel EX 9.8 XT Gen 6

The seventh-generation Trek Fuel EX shifts away from its cross-country origins to become a decidedly aggressive, descending-biased trail bike. In its standard configuration, it pairs 145mm of rear suspension with a 150mm fork on dual 29-inch wheels. However, the defining characteristic of the Gen 7 platform is its modularity. By swapping rocker links and lower shock mounts, riders can reconfigure the chassis into a mixed-wheel MX setup or a long-travel LX enduro machine. This adaptability makes it highly versatile, but the core EX model is built for riders who prioritize downhill composure and technical traction over lightweight sprinting. Trek also updated the frame with a standard ZS headset, refined internal storage, and a straighter seat tube to accommodate longer dropper posts. It is a substantial, heavily built trail bike designed to survive rough terrain rather than dance lightly over it.

$4,500Gen Gen 7

Build

Size

Inventory

Size M

$7,150

See deal →

Stack	624mm
Reach	460mm
Top tube	583mm
Headtube length	110mm
Standover height	742mm
Seat tube length	400mm

Fit and geometry

The Gen 7 geometry places the rider in a highly centralized, upright posture that heavily influences both climbing efficiency and descending control. Trek steepened the effective seat tube angle to nearly 78 degrees on some sizes, which prevents the rider's weight from cantilevering over the rear axle on steep pitches. This keeps the front wheel weighted and minimizes unwanted suspension sag during seated efforts.

At the front, a significantly taller stack height pairs with stock 40mm high-rise handlebars to create a commanding stance. This tall front end prevents riders from feeling pitched forward on steep roll-ins, encouraging an assertive, centered riding style.

A major structural update is the move to a straight, uninterrupted seat tube. This allows for massive dropper post insertion, with large and extra-large frames easily accommodating 200mm posts. The combination of the low bottom bracket, compact standover, and deep dropper insertion gives riders ample room to lean the bike aggressively through corners, offsetting some of the sluggishness that might otherwise come from its heavy chassis.

Full specs

Frameset

Frame

OCLV Mountain Carbon, internal storage, angle-adjust headset, Mino Link adjustable geometry, adjustable leverage rate, guided internal routing, magnesium rocker link, 34.9mm seat tube, ISCG 05, 55mm chainline, BSA 73, downtube guard, shuttle guard, ABP, UDH, Boost148, 140mm travel

Fork

Fox Performance 36, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 150mm travel

Rear shock

Fox Performance Float X, 2-position damper, 185mm x 55mm

Weight

M - 14.48 kg / 31.93 lbs (with TLR sealant, no tubes)

Groupset

Shift levers

Shimano XT M8100, 12-speed

Rear derailleur

Shimano XT M8100, long cage

Cassette

Shimano XT M8100, 12-speed, 10-51T

Chain

Shimano Ultegra/XT M8100

Crankset

Shimano XT M8120, 30T, 55mm chainline, 170mm length

Bottom bracket

Shimano BB-MT501, BSA

Front brake

Shimano XT M8120, 4-piston hydraulic disc

Rear brake

Shimano XT M8120, 4-piston hydraulic disc

Front rotor

Shimano RT86, 6-bolt — 180mm (XS/S/M/ML/L/XL); 203mm (M/ML/L/XL)

Rear rotor

Shimano RT86, 6-bolt — 180mm (XS/S/M/ML/L/XL); 203mm (M/ML/L/XL)

Wheelset

Front wheel

Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle — XS/S: 27.5in; S/M/ML/L/XL: 29in

Rear wheel

Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, Shimano Micro Spline, Boost148, 12mm thru axle — XS/S: 27.5in; S/M/ML/L/XL: 29in (rear hub/driver listed as Rapid Drive 108, 6-bolt; also listed: Formula CL-3348M, alloy, CenterLock, Micro Spline, Boost148 for M/ML/L/XL)

Front tire

Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 60 tpi — XS/S: 27.5x2.50; S/M/ML/L/XL: 29x2.50

Rear tire

Bontrager SE5 Team Issue, Tubeless Ready, Core Strength sidewalls, aramid bead, 60 tpi — XS/S: 27.5x2.50; S/M/ML/L/XL: 29x2.50

Cockpit

Stem

Bontrager Line Pro, 35mm, Blendr compatible, 0 degree, 35mm length (also listed: Bontrager RSL Integrated handlebar/stem — XS/S: 35mm stem; M/ML/L/XL: 45mm stem)

Handlebars

Bontrager Line Pro, OCLV Carbon, 35mm clamp, 27.5mm rise, 780mm width (also listed: Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5mm rise, 820mm width)

Saddle

Bontrager Arvada, austenite rails, 138mm width (also listed: Verse Short Comp, steel rails, 145mm width)

Seatpost

Bontrager Line Elite Dropper, MaxFlow, internal routing, 34.9mm — XS/S: 100mm travel (345mm length); M/ML: 150mm (440mm); L: 170mm (485mm); XL: 200mm (550mm)

Grips

Bontrager XR Trail Elite, nylon lock-on

Builds

The Gen 7 Fuel EX lineup spans a wide price range, split between Alpha Platinum aluminum frames and OCLV Mountain Carbon options. The entry-level EX 5 provides a basic RockShox Recon fork and Shimano Deore drivetrain, but the alloy EX 8 is widely considered the value sweet spot. It pairs a Fox 36 Rhythm fork and Float X shock with SRAM's wireless Eagle 70 Transmission and DB8 four-piston brakes, offering high-end shifting reliability at a mid-tier price.

Moving into the carbon models, the 9.8 and 9.9 tiers introduce premium suspension, including Fox Factory Grip X2 or RockShox Lyrik Ultimate forks, alongside carbon wheels and handlebars. Drivetrain options at the upper end split between Shimano XT (mechanical or Di2) and SRAM's higher-tier Eagle 90 and X0 Transmissions. Braking also upgrades to SRAM Maven or Shimano XT four-piston calipers for increased stopping power. While the modular frame design allows riders to convert any EX build into an MX or LX configuration, doing so requires purchasing separate rocker links, lower shock mounts, and potentially new suspension components.

5 Gen 6

$2,300

5 Gen 7

$2,900

8 GX AXS T-Type Gen 6

$3,200

8 XT Gen 6

$3,200

8 Gen 7

$4,000

9.8 XT Gen 6

$4,500

Selected

9.8 GX AXS T-Type Gen 6

$4,800

9 Eagle 90 Gen 7

$5,000

9 XT Gen 7

$5,000

9 XT Di2 Gen 7

$5,500

9 X0 AXS Gen 7

$6,000

9.8 Eagle 90 Gen 7

$6,000

9.8 XT Gen 7

$6,000

9.8 XT Di2 Gen 7

$6,500

9.9 X0 AXS Gen 7

$8,500

Reviews

Reviewers consistently characterize the Gen 7 Fuel EX as a highly composed descender that masks its substantial weight with sophisticated suspension. The revised kinematics and Active Braking Pivot design provide excellent traction, keeping the rear wheel "glued to the ground" (Flow Mountain Bike) over rapid-fire hits and heavy braking. Testers found the initial suspension stroke offers a "useful, helpful, comfortable bit of ease" (Singletrackworld) that prevents the bike from feeling skittish on technical trails.

When pointed downhill, the bike's mass becomes an asset. The heavy frame delivers an "unshakeably anchored" (Mountain Bike Rider) sensation that mimics much larger gravity bikes, making it a "rocket on steep descents" (Cycling Magazine). However, that same weight creates noticeable inertia on flat terrain and out of slow corners. While it excels at technical, traction-limited climbing, testers noted it requires more effort to accelerate than lighter trail competitors.

The primary criticism across reviews centers on the stock Bontrager Brevard tires, which testers found too flimsy for the bike's aggressive capabilities, frequently suffering punctures. Additionally, some reviewers experienced cable rattle on the alloy frames and an internal rattle on the Fox 36 Rhythm fork equipped on the EX 8 build.

Cycling Magazine

Review: Can Trek’s Fuel(s) platform be most things to most people?

Terry McKall·Dec 2025

Flow Mountain Bike

2026 Trek Fuel EX 8 Review | Redefining the modern trail ...

Dec 2025

YouTube

First impressions: Gen. 7 Trek Fuel EX and Fuel LX

Canadian Cycling Magazine·Aug 2025

Blisterreview

Trek Fuel EX, MX, & LX

David Golay·Aug 2025

Singletrackworld

Trek Fuel EX 8 first ride review

Ben Haworth·Aug 2025

Mountain Bike Rider

Trek’s new alloy-framed Fuel 8 is over £1,000 cheaper than the outgoing model, and small changes help it rip even harder on the trails: but at 17kg it weighs nearly as much as some e-bikes - MBR

Guy Kesteven·Aug 2025