Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2021 Trek Top Fuel 9.8 GX AXS
Previous used estimate
$2,686 - $2,763
Actual value depends on condition, size, and local demand.
Value Guide market data · 2021 Trek Top Fuel 9.8 GX AXS
12-month projected trend
13%
Direction and magnitude, not judgment
vs. category average
7%
Drops faster than category avg
Price over time - 2021 Trek Top Fuel 9.8 GX AXS
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Top Fuel model years
2026$7,399 - $7,613▲ 176% vs. 2021
2025$7,259 - $7,468▲ 170% vs. 2021
2024$5,746 - $5,912▲ 114% vs. 2021
2023$3,560 - $3,663▲ 33% vs. 2021
2022$3,739 - $3,847▲ 39% vs. 20212021$2,686 - $2,763Currently viewing
2020$3,371 - $3,468▲ 26% vs. 2021
2019$1,149 - $1,182▼ 57% vs. 2021
2018$1,234 - $1,270▼ 54% vs. 2021Overview
About this bike
Top Fuel 9.8 is a full suspension carbon mountain bike for riders who don't settle. Not for parts nor for one style of riding. It combines a high-end parts package and wireless electronic drivetrain with a low-weight carbon frame for one unbelievably fun rig that's fast on flow and still fun to ride on techy singletrack. It's right for you if... You're looking for a do-it-all full suspension mountain bike that's efficient and fast, but doesn't shy away from some bigger stuff. You want the added stiffness and weight savings of a carbon frame and want the performance upgrade of a fully wireless electronic drivetrain. The tech you get A light and stiff full carbon frame, 120mm RockShox SID Select+ fork, 115mm of rear travel with a RockShox SID Luxe Ultimate shock, and a SRAM GX Eagle AXS wireless electronic drivetrain with an extra-low 52-tooth climbing gear. Plus, wide carbon Bontrager Kovee Elite 30 wheels with a 54-tooth Rapid Drive hub for fast engagement, Bontrager Line Elite Dropper, and powerful 4-piston brakes. The final word Top Fuel 9.8 is a ridiculously fun carbon down-country bike with upgraded parts that give you noticeable benefits on the trail, like more speed from the carbon wheels, more grip from the ultra-smooth suspension, and more precise shifts with a SRAM AXS drivetrain. Why you'll love it - The SRAM GX Eagle AXS drivetrain is smart, smooth, and completely wireless - You get a Straight Shot downtube for extra-stiff, responsive handling without added weight, and a Knock Block headset that protects against spinning bars and fork crowns - Bontrager DropLock's shifter-style lever lets you easily lock out both front and rear shocks at the same time for added sprinting or climbing efficiently. Plus, it controls your dropper post too - Wider Kovee Elite 30 wheels provide better tire support so you can run lower pressure and get more traction - This short-travel bike has a killer suspension setup reminiscent of the all-mighty mullet—it's both efficient and ready to party
Specifications
- Subtype
- Cross Country
- Category
- Mountain
- Component Fork
- RockShox SID Select+, DebonAir spring, Charger 2 RL damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 120mm travel
- Component Size
- Small, Medium, Medium/Large, Large, X-Large
- Component Stem
- Bontrager Kovee Pro, 35mm, Knock Block, Blendr compatible, 13 degree
- Product Family
- Top Fuel
- Component Chain
- SRAM GX Eagle, 12 speed
- Component Color
- Gloss Red/Matte Carbon Smoke, Carbon Blue Smoke/Radioactive Coral, Matte Raw Carbon/Voodoo Trek Black
- Component Frame
- OCLV Mountain Carbon main frame & stays, tapered head tube, Knock Block, Control Freak internal routing, Carbon Armor, magnesium rocker link, Mino Link, ABP, Boost148, 115mm travel
- Component Brakes
- SRAM G2 RS 4-piston hydraulic disc
- Component Pedals
- Sold separately
- Component Rotors
- SRAM CenterLine, 6-bolt, round edge, 180/160mm
- Component Saddle
- Bontrager Montrose Elite, titanium rails, 138mm width
- Component Headset
- Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8" top, 1.5" bottom
- Component Crankset
- SRAM GX 7K Eagle, DUB, 32T alloy ring, 52mm chainline
- Component Seatpost
- Bontrager Line Elite dropper, MaxFlow, internal routing, 31.6mm
- Component Shifters
- SRAM GX Eagle AXS, 12 speed
- Component Handlebar
- Bontrager Line Pro, OCLV Carbon, 35mm, 15mm rise, 750mm width
- Component Rear Tire
- Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120tpi, 29 x 2.40"
- Component Wheel Set
- Bontrager Kovee Elite 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 54, XD Driver, 6-bolt, 148x12 rear, 110x15 front
- Component Front Tire
- Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120tpi, 29 x 2.40"
- Component Rear Shock
- RockShox SID Luxe Ultimate, DebonAir spring, Ultimate RL damper, 190x45mm
- Component Tape Grips
- Bontrager XR Trail Elite, nylon lock-on
- Component Bottom Bracket
- SRAM DUB, 92mm, PressFit
- Component Rear Derailleur
- SRAM GX Eagle AXS
- Component Accessories Extras
- Bontrager TLR sealant, 6oz; Bontrager TLR valve, 50mm
- Component Cassette Freewheel
- SRAM Eagle XG-1275, 10-52, 12 speed
- Rear Shock
- RockShox SID Luxe Ultimate, DebonAir spring, Ultimate RL damper, 190x45mm
- Crankset
- SRAM GX 7K Eagle, DUB, 32T alloy ring, 52mm chainline
- Pedals
- Sold separately
- Bottom Bracket
- SRAM DUB, 92mm, PressFit
- Chain
- SRAM GX Eagle, 12 speed
- Seatpost
- Bontrager Line Elite dropper, MaxFlow, internal routing, 31.6mm
- Saddle
- Bontrager Montrose Elite, titanium rails, 138mm width
- Handlebar
- Bontrager Line Pro, OCLV Carbon, 35mm, 15mm rise, 750mm width
- Headset
- Knock Block Integrated, 58-degree radius, cartridge bearing, 1-1/8" top, 1.5" bottom
- Rear Derailleur
- SRAM GX Eagle AXS
- Rear Tire
- Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120tpi, 29 x 2.40"
- Stem
- Bontrager Kovee Pro, 35mm, Knock Block, Blendr compatible, 13 degree
- Accessories & Extras
- Bontrager TLR sealant, 6oz; Bontrager TLR valve, 50mm
- Brakes
- SRAM G2 RS 4-piston hydraulic disc
- Fork
- RockShox SID Select+, DebonAir spring, Charger 2 RL damper, tapered steerer, 44mm offset, Boost110, 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, Boost148, 115mm travel
- Shifters
- SRAM GX Eagle AXS, 12 speed
- Tape/Grips
- Bontrager XR Trail Elite, nylon lock-on
- Color
- Matte Raw Carbon/Voodoo Trek Black
- Size
- X-Large
- Cassette/Freewheel
- SRAM Eagle XG-1275, 10-52, 12 speed
- Rotors
- SRAM CenterLine, 6-bolt, round edge, 180/160mm
- Wheel Set
- Bontrager Kovee Elite 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 54, XD Driver, 6-bolt, 148x12 rear, 110x15 front
- Front Tire
- Bontrager XR3 Team Issue, Tubeless Ready, Inner Strength sidewall, aramid bead, 120tpi, 29 x 2.40"
What to check when buying used
Inspection
Drivetrain wear
Check chain stretch, cassette teeth, chainrings, and shifting under load before negotiating price.
Inspection
Service history
Ask for service records covering bearings, brakes, drivetrain, and any frame or fork warranty work.
Inspection
Suspension service
Confirm fork and rear shock service intervals and check pivot bearings for play.