2021 Trek Fuel EX 8 GX

A 27.5″ / 29″ aluminum frame full suspension trail bike with high-end components, priced near the low end of the Fuel EX model range.

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2021 Trek Fuel EX 8 GX
MSRP$3,899
Weight30.4 lbs
Front Travel140mm
Rear Travel130mm
FrameAluminum
ForkFox Rhythm Float 34
Wheels27.5″ / 29″
Tire Clearance2.6"
Drivetrain1 × 12
GroupsetGX Eagle, X1
BrakesHydraulic Disc
SeatpostDropper post
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Gearing

1 × 12 — 12 speed

Fuel EX 8 GX

26 mph

Similar Bikes

26 mph

The Fuel EX 8 GX is easier to ride up hills than similar bikes.

The Fuel EX 8 GX is geared about the same as similar bikes for riding downhill.


Estimated Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more. Learn more

Spec level →$0$500$1,000$1,500$2,000$2,500$3,000$3,500
This bike
Other trail bikes

Reviews

October 2020

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

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.

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August 2020

ENDURO Mountainbike Magazine
Trek Fuel EX 8.0 XT 2020 on test – Versatility for the Best Buy

The Trek Fuel EX is the most expensive bike in this group test, yet is still awarded our Best Buy – how is that possible? Read our review to find out what makes this bike so good.

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June 2020

Freehub
2020 Trek Fuel EX 9.9 // Bike Review

As warmer temperatures hit the Pacific Northwest and the dirt starts to dry, I’m always eager to get out on some long rides with some big climbs. Naturally, when this Trek Fuel EX 9.9 showed up at the Freehub office, I knew it was time to put the nimble beast through its paces. I challenged myself to a 60-mile sufferfest on some of Bellingham, Washington’s toughest climbs and descents. It definitely didn’t let me down. Climbing on this bike was a joy. Trek equipped the 9.9 model with its proprietary RE:aktiv shock with a three-position damper, which I left wide open for the entire ride. The rear suspension had an overwhelmingly supportive feel while pedaling out of the saddle, yet as soon as I hit a bump it dived deeper into the travel, keeping the rear wheel firmly planted and providing excellent traction. The geometry is modern and balanced, with a long reach and a sensible 76-degree seat angle. On the descents, the bike inspired confidence, thanks to its long wheelbase and bottomless-feeling suspension. My confidence was further enhanced by the reliable stopping power of the Shimano XT brakes. As a 200-pound rider, I couldn’t have appreciated the ultra-powerful XT brakes and the 203-millimeter front rotor more—especially while bombing down some of Bellingham’s scariest double-black trails.

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April 2020

Mountain Bike Action
Mountain Bike Action Bike Test: Trek Fuel Ex Trail Bike

Can it get any better than this?

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April 2020

BikeRadar
Trek Fuel EX 9.7 review

A classic trail bike, with a fun and engaging ride built around a solid frame

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April 2020

Flow Mountain Bike
9 Lessons We've Learned About Our 2020 Trek Fuel EX 9.8 Test Bike

After six months of testing, it's time to the deliver the review of our 2020 Trek Fuel EX 9.8 long-term test bike. Here we take a closer look at some of the other parts we've changed and the problems we've encountered, and discuss exactly what this 130mm travel trail bike does best.

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December 2019

BIKE Magazine
Bible Review: Trek Fuel EX 9.9

The Quintessential letterman athlete—pulling straight A's, playing hoops and running track, with manners perfect for meeting the parents.

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November 2019

MBR
Trek Fuel EX 9.8 review - MBR

The updated Trek Fuel EX now features storage in the downtube, 29er wheels, more travel and a gorgeous frame… oh and it’s rollicking fast too.

Read Full 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"

Fork

Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel

Rear 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

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, 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

Grips

Bontrager XR Trail Elite, nylon lock-on

Groupset
Rear Derailleur

SRAM GX Eagle

Crank

Size: XS, S, SRAM X1 Eagle, DUB, 30T steel ring, Boost (52mm chainline), 170mm length; Size: M, ML, L, XL, XXL, SRAM X1 Eagle, DUB, 30T steel ring, Boost (52mm chainline), 175mm length

Shifters

SRAM GX Eagle, 12 speed

Cassette

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

Chain

SRAM GX Eagle, 12 speed

Brakes

SRAM G2 R 4-piston 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, 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, M, ML, L, XL, XXL, Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120tpi, 29.x2.40''; 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 sidewalls, aramid bead, 120 tpi, 29x2.60''

Disk Rotors

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

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