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2021 Trek

Fuel EX 8 XT

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

Manufacturer Price

$3,799
Weight30.6 lbs  
FrameAluminum
SuspensionFull, 130 / 140mm
ForkFox Rhythm Float 34
ShockFox
Wheels27.5″ / 29″ Aluminum
Drivetrain1 × 12
GroupsetXT, SLX
BrakesShimano Hydraulic Disc
SeatpostDropper
Where to Buy
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Top Comparison
Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Fuel EX 8 XT
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 8 XT

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

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.

Read Review

Bike Perfect
Trek Fuel EX 8 review – still one of the best trail MTBs?

May 2022 · Guy Kesteven

Trek’s alloy Fuel EX trail mountain bike lacks the latest features but is the overall package still a winner?

Highs
  • Tight, precise frame

  • Sorted all round handling

  • Very efficient suspension feel

  • Durable Shimano kit

  • Excellent sizing options

Lows
  • Heavy frame

  • No internal storage

  • Press fit bottom bracket

  • Top Fuel is more playful

Read Review

Beta
Trek Introduces the New Top Fuel

Oct 2021 · Ryan "Squirrel" LaBar

Adding fire to the Fuel

Read Review

Gran Fondo Magazine
Trek Fuel EX 9.9 XTR Project One in bikepacking review

Oct 2020 · Benjamin Topf

The Trek Fuel EX 9.9 is an absolute classic in the trail bike segment. Could it also be the perfect bike for the next bikepacking adventure with its modern geometry and spare parts compartment in the down tube? We put the Fuel EX to the test.

Highs
  • Maximum fun on the descents

  • Intuitive and good-natured handling

  • Storage compartment in the down tube for tools or snacks

Lows
  • Too sluggish on easy terrain

  • Too much bike for long straights

  • Chain slap

Read Review

Mountain Flyer
First Impressions: Trek Top Fuel 9.8 GX

Oct 2020

My history of mountain biking started with a little wooden trike, with no pedals and wheels bigger than my head. I moved forward as any child does onto a bigger bike with bigger wheels and pedals. My parents always encouraged me to get outside and ride a bike, although I didn’t like the idea of mountain biking. I knew how to ride a bike; why go any further?

Read Review

Geometry
Specs
Build
Frame

Alpha Platinum Aluminum, tapered head tube, Knock Block, Control Freak internal routing, downtube guard, ISCG 05, magnesium rocker link, Mino Link, ABP, Boost148, 130mm travel

BB StandardBB86/BB92, Press Fit

Tire Clearance2.6"

ColorRage Red to Dnister Black Fade

Fork

Fox Rhythm 34, 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, 3-position RE:aktiv damper, tuned by Trek Suspension Lab, 210mm x 52.5mm; Size: S, M, ML, L, XL, XXL, Fox Performance Float EVOL, 3-position RE:aktiv damper, tuned by Trek Suspension Lab, 210mm x 55mm

Travel130mm

Bottom Bracket

Shimano MT500, 92mm, PressFit

Headset

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

Stem

Size: XS, S, Bontrager Line, 35mm, Knock Block, 0 degree, 40mm length; Size: M, ML, L, XL, XXL, Bontrager Line, 35mm, Knock Block, 0 degree, 50mm length

Handlebar

Size: XS, S, Bontrager Line, alloy, 35mm, 27.5mm rise, 750mm width; Size: M, ML, L, XL, XXL, Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width

Saddle

Bontrager Arvada, hollow chromoly rails, 138mm width

Seatpost

Size: XS, S, Bontrager Line Dropper, 100mm travel, internal routing, 31.6mm, 345mm length; Size: M, ML, L, XL, XXL, Bontrager Line Dropper, 150mm travel, internal routing, 31.6mm, 440mm length

TypeDropper

Grips

Bontrager XR Trail Elite, nylon lock-on

Groupset
Rear Derailleur

Shimano XT M8100, long cage, 51T max cog

Crank

Size: XS, S, Shimano SLX M7100, 30T alloy ring, Boost (52mm chainline), 170mm length; Size: M, ML, L, XL, XXL, Shimano SLX M7100, 30T alloy ring, Boost (52mm chainline), 175mm length

Shifters

Shimano XT M8100, 12 speed

Cassette

Shimano XT M8100, 10-51, 12 speed

Chain

Shimano SLX M7100, 12 speed

Brakes

Shimano hydraulic disc, MT4100 lever, MT420 4-piston caliper

TypeShimano Hydraulic Disc

Wheels
Rims

Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle

Spokes

DT Swiss Champion, J-Bend, Black

Front Hub

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

Rear Hub

Bontrager alloy, sealed bearing, 6-bolt, Shimano MicroSpline freehub, Boost148, 12 mm 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, XXL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 29x2.40''; Size: S, M, ML, L, XL, XXL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 29x2.60''

Disc Rotors

Size: XS, S, M, ML, L, XL, XXL, Shimano RT66, 6-bolt, 180mm; Size: M, ML, L, XL, XXL, Shimano RT66, 6-bolt, 203mm

Rider Notes
Riders Also Viewed

First added July 17

Last updated April 16

Not listed for 1,869 days