Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Fuel EX 8 GX
Value Guide market data · 2021 Trek Fuel EX 8 GX
12-month trend
10%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2021 Trek Fuel EX 8 GX
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Fuel model years
2026$3,720 - $4,320▼ 62% vs. 2021
2025$10,230 - $11,880▲ 4% vs. 2021
2024$11,625 - $13,500▲ 18% vs. 2021
2023$13,020 - $15,120▲ 33% vs. 2021
2022$8,882 - $10,314▼ 9% vs. 2021
2021$9,812 - $11,394Currently viewing
2020$7,905 - $9,180▼ 19% vs. 2021
2019$7,254 - $8,424▼ 26% vs. 2021
2018$8,277 - $9,612▼ 16% vs. 2021
2017$7,812 - $9,072▼ 20% vs. 2021
2016$7,812 - $9,072▼ 20% vs. 2021
2015$8,789 - $10,206▼ 10% vs. 2021
2014$7,719 - $8,964▼ 21% vs. 2021
2013$7,812 - $9,072▼ 20% vs. 2021
2012$8,686 - $10,087▼ 11% vs. 2021
2011$7,319 - $8,500▼ 25% vs. 2021
2010$6,343 - $7,366▼ 35% vs. 2021
2009$6,650 - $7,722▼ 32% vs. 2021
2008$5,729 - $6,653▼ 42% vs. 2021
2007$1,581 - $1,836▼ 84% vs. 2021
2006$1,953 - $2,268▼ 80% vs. 2021
2005$2,353 - $2,732▼ 76% vs. 2021
2004$4,464 - $5,184▼ 55% vs. 2021
2003$4,092 - $4,752▼ 58% vs. 2021
2002$3,069 - $3,564▼ 69% vs. 2021
2001$2,744 - $3,186▼ 72% vs. 20212021 Fuel EX 8 GX lineup
Overview
About this bike
2021 Trek Fuel EX 8 GX value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Rear Shock
- Fox Performance Float EVOL, RE:aktiv 3-position damper, tuned by Trek Suspension Lab
- Fork
- Fox Rhythm 34, Float EVOL air spring, GRIP damper, tapered steerer, 44mm offset, Boost110, 15mm Kabolt axle, 140mm travel
- 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
Drivetrain
- Groupset
- 2021 Trek Fuel EX 8 GX
- Crankset
- SRAM X1 Eagle, DUB
- Bottom Bracket
- SRAM DUB, 92mm, PressFit
- Chain
- SRAM GX Eagle, 12 speed
- Rear Derailleur
- SRAM GX Eagle
- Cassette/Rear Cogs
- SRAM Eagle XG-1275, 10-52, 12 speed
- Chainrings
- 30T steel ring
- Shifters
- SRAM GX Eagle, 12 speed
Brakes
- Brakes
- SRAM G2 R 4-piston hydraulic disc
Cockpit
- Saddle
- Bontrager Arvada, hollow chromoly rails, 138mm width
- Headset
- Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom
- Stem
- Bontrager Line, 35mm, Knock Block, 0 degree
- Handlebars
- Bontrager Line, alloy, 35mm, 27.5mm rise, 750mm width
- Seat Post
- Bontrager Line Dropper, internal routing, 31.6mm
Wheels & Tires
- Tires
- Size XS - SM: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewalls, aramid bead, 120 tpi, 27.5x2.40''<br>Size SM - XXL: Bontrager XR4 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120 tpi, 29x2.40''
- Axles
- Front: 110 x 15mm<br>Rear: 148 x 12mm
- Wheel Size
- 27.5-inch / 29-inch
Pedals
- Pedals
- Sold separately
Accessories
- Rims/Wheels
- Front: Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle<br>Rear: Bontrager Line Comp 30, Tubeless Ready, 6-bolt, 54T Rapid Drive, SRAM XD driver, Boost148, 12mm thru axle
- Color
- Rage Red to Dnister Black Fade / Dark Aquatic/Trek Black
Weight & Sizing
- Size
- X-Small / Small / Medium / Medium/Large / Large / X-Large / XX-Large
Frame sizing
XS4'10"-5'2"
S5'2"-5'6"
M5'6"-5'10"
L5'10"-6'2"
XL6'2"-6'6"
M highlighted as most common resale size. Sourced from catalog metadata.
Geometry
- Stack
- Varies by size
- Reach
- Varies by size
- Wheelbase
- Varies by size
Industry standard. Sourced from catalog metadata.
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Wheel condition
Inspect rims, hubs, spokes, and bearing play; ask about the tire age and any prior wheel rebuilds.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Suspension service
Confirm fork lowers and rear shock service intervals; ask for the most recent service receipts.
Inspection
Frame pivots & bearings
Cycle the suspension off the bike to feel for play, grit, or noise in pivot bearings.