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2021 Trek

Fuel EX 9.8 GX AXS

A 27.5″ / 29″ carbon frame full suspension trail bike with high-end components.

Manufacturer Price

$6,699
Weight29.1 lbs  
FrameCarbon
SuspensionFull, 130 / 140mm
ForkFox Performance Float 36
ShockFox
Wheels27.5″ / 29″ Carbon
Drivetrain1 × 12 Electronic
GroupsetEagle AXS, GX Eagle AXS
BrakesSRAM G2 RS Hydraulic Disc
SeatpostDropper
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Fuel EX 9.8 GX AXS
Other Trail bikes
Gearing

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.

Lowest gear

(climbing)

26 mph

Fuel EX 9.8 GX AXS

26 mph

Similar Bikes

Highest gear

(descending)

Reviews

Summary

The Trek Fuel is a versatile and capable trail bike, praised for its improved suspension performance, adjustable geometry, and overall ride quality. It excels in a variety of terrains, offering a balanced mix of climbing efficiency and descending prowess. The bike's RE:aktiv and Thru Shaft shock technologies enhance its bump absorption and pedaling efficiency, making it a favorite among riders for its comfort and traction.

Pros
  • Versatile trail bike

  • Improved frame stiffness and tire clearance

  • RE:aktiv and Thru Shaft shock tech enhances ride quality

  • Adjustable geometry for personalized fit

  • Good traction and comfort on varied terrain

Cons
  • Frame storage hole too small for some pumps

  • Stock saddle limits adjustability

  • Line dropper post slower than leading aftermarket options

  • Heavy for spec and travel

  • Costs more than parts sold separately

Key Quotes
The Fuel EX is still the Fuel EX. It just got a little bit EX-er.
BIKE Magazine logoBIKE Magazine
It’s clearly a brilliantly balanced all-rounder.
Bike Perfect logoBike Perfect
The new EX is bigger and more capable. It faces tougher competition, but its performance, features, and adaptability make it a compelling option.
Bicycling
The Fuel EX has long been a benchmark trail bike.
BikeRadar logoBikeRadar
The Trek Fuel EX 9.9 is an absolute classic in the trail bike segment.
Gran Fondo Magazine logoGran Fondo Magazine

Feedback?

View all reviews

Pinkbike
Field Test: Trek Fuel EX - Evolution Underlined

Dec 2022 · Mike Levy

The downtube storage compartment is on the new bike, and while it seems like Trek has put all the things onto the latest Fuel EX, there's one that they didn't: Knock Block.

Highs
  • Wide range of effective geometry adjustments

  • Just as much fun on smooth trails as it is on scary trails

  • Great climber, efficient pedaling

Lows
  • One-piece handlebar might be too stiff for some riders

  • Paint chips easily

Read Review

Singletracks
The Trek Fuel EX 9.8 Gen 6 is a Poised, Do-it-all Trail Bike [Review]

Nov 2022 · Matt Miller

The latest Trek Fuel EX trail bike grows in travel and geometry, but still dominates the climbs.

Highs
  • Capable and adaptable mid-travel trail bike

  • A lot of adjustability

  • Great price points, and alloy version

Lows
  • Too many options for adjustability?

Read Review

Bicycling
The New Trek Fuel EX Puts On Weight, Punches Harder, and Expands Its Reach

Sep 2022

New geometry, more travel, and even better suspension improves Trek's mid-weight trail bike.

Read Review

Bike Perfect
Trek Fuel EX 9.9 XX1 AXS – a brilliantly balanced all-rounder at an eye-watering cost

Sep 2022 · Guy Kesteven

More travel, longer, slacker and steeper, with extra adjustability and shock options. But how does Trek’s new trail all-rounder ride?

Highs
  • Superbly balanced adjustable geometry

  • Awesome suspension performance in ‘progressive’ mode

  • Poppy, playful and fast-climbing for its weight

  • Truly premium wireless, Fox Factory, carbon-loaded spec

  • Lifetime warranty, threaded BB and tunneled routing

Lows
  • Heavy for spec and travel

  • Costs more than parts sold separately

  • Default shock set-up is too linear

  • Headset adjustment is laborious

  • XX1 is fragile for aggro trail use

Read Review

BikeRadar
Trek Fuel EX 9.9 XX1 AXS first ride review

Sep 2022 · Tom Marvin

Does the benchmark trail bike retain its reputation as a solid choice?

Highs
  • Excellent suspension

  • Solid feel to the frame

  • Great geometry

Lows
  • Doesn’t feel as sprightly on climbs as some

  • Tyres give up corner traction too easily in loose or muddy conditions

Read Review

NSMB
Trek Top Fuel Review

Jul 2022

This Trek Top Fuel review has it all: Speed, sustainability, shifting mindsets, and thoughts on the new breed of short travel trail bikes.

Highs
  • Efficient climber with active suspension

  • Rewards punchy efforts and sit-and-spin periods

  • Excels on undulating terrain

  • Solid chassis feel descending

  • Confidence-inspiring descending on less extreme terrain

  • Good for random trail yanks

Lows
  • Higher bottom bracket and lower stack height noticeable on steep descents

  • Requires conscious effort to stay centered on steep, rough terrain

  • Less confidence on steep, ugly terrain compared to Spur and Tallboy

  • Expensive (top model $13,974 CAD)

Read Review

Beta
Trek Introduces the New Top Fuel

Oct 2021 · Ryan "Squirrel" LaBar

Adding fire to the Fuel

Read Review

Enduro Mountainbike Magazine
Trek Fuel EX 9.8 GX 2021 in review - Trail performance over bling components

Jun 2021 · Peter Walker

The Trek Fuel EX has proven itself as an excellent all-rounder in the past. This year, the American brand enters the race with the € 5,999 Trek Fuel EX 9.8 GX, which combines a high-end frame with a mid-level spec but still features Trek's Thru Shaft shock technology. So does it always have to be top-spec? How big is the difference in performance and how does the Fuel EX 9.8 GX fare against its more expensive peers?

Highs
  • Very comfortable uphill

  • Intuitive handling

  • High-quality frame with integrated storage compartment

Lows
  • Tires are very puncture prone and generate little traction

  • Brakes don't do the bike’s potential justice

Read Review

Geometry
Specs
Build
Frame

OCLV Mountain Carbon main frame & stays, internal storage, tapered head tube, Knock Block, Control Freak internal routing, Carbon Armor, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130mm travel; OCLV Mountain Carbon main frame & stays, internal storage, tapered head tube, Knock Block, Control Freak internal routing, Carbon Armor, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130mm travel

BB StandardBB86/BB92, Press Fit

Tire Clearance2.6"

ColorsRaw Carbon / Rage Red; Lithium Grey / Factory Orange; Matte Carbon Smoke

Fork

Fox Performance 36, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel

Travel140mm

Spring TypeAir

Shock

Size: XS, S, Fox Performance Float EVOL, RE:aktiv with Thru Shaft 3-position damper, tuned by Trek Suspension Lab, 210mm x 52.5mm; Size: S, M, ML, L, XL, Fox Performance Float EVOL, RE:aktiv with Thru Shaft 3-position damper, tuned by Trek Suspension Lab, 210mm x 55mm

Travel130mm

Bottom Bracket

SRAM DUB, 92mm, PressFit

Headset

Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom

Stem

Size: XS, S, Bontrager Line Pro, 35mm, Knock Block, Blendr compatible, 0 degree, 35mm length; Size: M, ML, L, XL, Bontrager Line Pro, 35mm, Knock Block, Blendr compatible, 0 degree, 45mm length

Handlebar

Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width

Saddle

Bontrager Arvada, austenite rails, 138mm width

Seatpost

Size: XS, S, Bontrager Line Elite, 100mm travel, MaxFlow, internal routing, 31.6mm, 340mm length; Size: M, ML, Bontrager Line Elite, 150mm travel, MaxFlow, internal routing, 31.6mm, 440mm length; Size: L, XL, Bontrager Line Elite, 170mm travel, MaxFlow, internal routing, 31.6mm, 480mm length

TypeDropper

Grips

Bontrager XR Trail Elite, nylon lock-on

Groupset
Rear Derailleur

SRAM GX Eagle AXS

Crank

Size: XS, S, SRAM GX Eagle, DUB, 30T alloy ring, Boost (52mm chainline), 170mm length; Size: M, ML, L, XL, SRAM GX Eagle, DUB, 30T alloy ring, Boost (52mm chainline), 175mm length

Shifters

SRAM GX Eagle AXS, 12 speed

Cassette

SRAM Eagle XG-1275, 10-52, 12 speed

Chain

SRAM GX Eagle, 12 speed

Brakes

SRAM G2 RS 4-piston hydraulic disc

TypeSRAM G2 RS Hydraulic Disc

Wheels
Rims

NEW Bontrager Line Elite 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle

Front Hub

Bontrager alloy, sealed bearing, alloy axle, 6-bolt, Boost110, 15mm thru axle

Rear Hub

Bontrager alloy, sealed bearing, 6-bolt, 108T Rapid Drive, SRAM XD driver, Boost148, 12mm thru axle

Tires

Size: XS, S, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.40''; Size: XS, S, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.60''; Size: S, M, ML, L, XL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 29x2.40''; Size: S, M, ML, L, XL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 29x2.60''

Disc Rotors

Size: XS, S, M, ML, L, XL, SRAM CenterLine, 6-bolt, round edge, 180mm; Size: M, ML, L, XL, SRAM CenterLine, 6-bolt, round edge, 200mm

Rider Notes
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First added April 9

Last updated August 15

Not listed for 1,397 days