Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Top Fuel 9.9 XX1 AXS
Value Guide market data · 2021 Trek Top Fuel 9.9 XX1 AXS
12-month trend
6%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2021 Trek Top Fuel 9.9 XX1 AXS
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Top Fuel model years
2026$9,300 - $10,8000% vs. 2021
2025$9,300 - $10,8000% vs. 2021
2024$9,300 - $10,8000% vs. 2021
2023$9,300 - $10,8000% vs. 2021
2022$9,021 - $10,476▼ 3% vs. 20212021$9,300 - $10,800Currently viewing
2020$9,765 - $11,340▲ 5% vs. 2021
2019$2,930 - $3,402▼ 68% vs. 2021
2018$3,720 - $4,320▼ 60% vs. 2021
2017$2,511 - $2,916▼ 73% vs. 2021
2016$2,418 - $2,808▼ 74% vs. 2021
2011$4,101 - $4,763▼ 56% vs. 2021
2010$2,930 - $3,402▼ 68% vs. 2021
2009$3,069 - $3,564▼ 67% vs. 20212021 Top Fuel 9.9 XX1 AXS lineup
Overview
About this bike
2021 Trek Top Fuel 9.9 XX1 AXS value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Rear Shock
- RockShox SID Luxe Ultimate, DebonAir spring, Ultimate RL damper, 190x45mm
- Fork
- RockShox SID Ultimate, DebonAir spring, Charger Race Day damper, remote lockout, tapered steerer, 44mm offset, 15mm Maxle Stealth, 120mm travel
- Frame
- OCLV Mountain Carbon main frame & stays, tapered head tube, Knock Block, Control Freak internal routing, Carbon Armor, magnesium rocker link, Mino Link, ABP, 115mm travel
Drivetrain
- Groupset
- 2021 Trek Top Fuel 9.9 XX1 AXS
- Crankset
- SRAM XX1 Eagle AXS, DUB, Boost (52mm chainline)
- Bottom Bracket
- SRAM DUB, 92mm, PressFit
- Chain
- SRAM XX1 Eagle, 12 speed
- Rear Derailleur
- SRAM XX1 Eagle AXS
- Cassette/Rear Cogs
- SRAM Eagle XG-1299, 10-52, 12 speed
- Chainrings
- 32T alloy ring
- Shifters
- SRAM Eagle AXS, wireless, 12-speed
Brakes
- Brakes
- SRAM G2 Ultimate hydraulic disc, carbon levers, SRAM CenterLine, 6-bolt, round-edge, 180/160mm rotors
Cockpit
- Saddle
- Bontrager Arvada, austenite rails, 138mm width
- Headset
- Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8'' top, 1.5'' bottom
- Stem
- Bontrager Kovee Pro, 35mm, Knock Block, Blendr compatible, 13 degree
- Handlebars
- Bontrager Line Pro, OCLV Carbon, 35mm, 15mm rise, 750mm width
- Seat Post
- RockShox Reverb AXS; Small: 100mm travel; Medium – Medium/Large: 150mm travel; Large – X-Large: 170mm travel
Wheels & Tires
- Tires
- Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120tpi, 29x2.40''
- Axles
- Front: 110 x 15mm thru-axle<br>Rear: 148 x 12mm thru-axle
Accessories
- Rims/Wheels
- Bontrager Kovee Pro 30 carbon, Tubeless Ready, Rapid Drive 108, 6-bolt, SRAM XD driver
- Color
- Matte Raw Carbon/Voodoo Trek Black / Gloss Red/Matte Carbon Smoke / Carbon Blue Smoke/Radioactive Coral
Weight & Sizing
- Size
- Small / Medium / Medium/Large / Large / X-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.