Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2026 Trek Top Fuel 9.8 XT Di2 Gen 4
Previous used estimate
$5,058 - $5,204
Actual value depends on condition, size, and local demand.
Value Guide market data · 2026 Trek Top Fuel 9.8 XT Di2 Gen 4
12-month projected trend
6%
Direction and magnitude, not judgment
vs. category average
30%
Drops faster than category avg
Price over time - 2026 Trek Top Fuel 9.8 XT Di2 Gen 4
Values based on actual sales data. Enter your bike's specifics to get a precise valuation.
All Top Fuel model years
2026$5,058 - $5,204Currently viewing
2025$7,259 - $7,468▲ 44% vs. 2026
2024$5,746 - $5,912▲ 14% vs. 2026
2023$3,560 - $3,663▼ 30% vs. 2026
2022$3,739 - $3,847▼ 26% vs. 2026
2021$3,063 - $3,151▼ 39% vs. 2026
2020$3,371 - $3,468▼ 33% vs. 2026
2019$1,149 - $1,182▼ 77% vs. 2026
2018$1,234 - $1,270▼ 76% vs. 2026Compare Top Fuel 9.8 XT Di2 Gen 4 models
1 modelsChoose a different build or frame style to see its value.
Overview
About this bike
Top Fuel 9.8 is a lightweight carbon trail bike built to rip up climbs and stay playful on descents. It gives you the confidence you want through roots and rocks, thanks to a 120mm/130mm (rear/front) RockShox suspension package with a Pike Select+ fork and Deluxe Ultimate shock. Plus, you get ultra-smooth and fast shifts from a 12-speed Shimano XT Di2 wireless drivetrain. Smart Wheel Sizing: Small: 27.5-inch Medium - X-Large: 29-inch
Specifications
- Subtype
- Cross Country
- Category
- Mountain
- Component Fork
- RockShox Pike Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 130mm travel
- Component Size
- Small, Medium, Medium/Large, Large, X-Large
- Component Stem
- Bontrager Line Pro, 35mm, Blendr compatible, 0 degree, 35mm length
- Product Family
- Top Fuel
- Component Chain
- Shimano Ultegra/XT M8100, 12 speed
- Component Color
- Matte Sedona Red/ Pennyflake, Dark Star
- Component Frame
- OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120mm travel
- Component Brakes
- Shimano XT M8200 4-piston hydraulic disc
- Component Rotors
- Shimano RT86, 6-bolt, 180mm
- Component Saddle
- Verse Short Comp, steel rails, 145mm width
- Component Crankset
- Shimano XT 8200, 30T, 55mm chainline, 170mm length
- Component Seatpost
- Size: S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length/Size: M, ML Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length/Size: XL, L Bontrager Line Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 515mm length
- Component Shifters
- Shimano XT Di2 M8250, 12 speed
- Component Handlebar
- Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
- Component Rear Tire
- Size: S Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40"/Size: XL, L, M, ML Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40"
- Component Wheel Set
- Front Wheel: Size: S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5"/Size: XL, L, M, ML Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29'' Rear Wheel: Size: S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 27.5"/Size: XL, L, M, ML Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 29''
- Component Front Tire
- Size: S Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40"/Size: XL, L, M, ML Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40"
- Component Rear Shock
- RockShox Deluxe Ultimate RCT, 185mm x 50mm
- Component Tape Grips
- Trek Line Elite, lock-on
- Component Wheel Size
- 27.5-inch, 29-inch
- Component Bottom Bracket
- Shimano BB-MT501 BSA
- Component Rear Derailleur
- Shimano XT M8250, long cage
- Component Cassette Freewheel
- Shimano XT M8200, 10-51, 12 speed
- Rear Shock
- RockShox Deluxe Ultimate RCT, 185mm x 50mm
- Crankset
- Shimano XT 8200, 30T, 55mm chainline, 170mm length
- Bottom Bracket
- Shimano BB-MT501 BSA
- Chain
- Shimano Ultegra/XT M8100, 12 speed
- Seatpost
- Size: S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9mm, 310mm length/Size: M, ML Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length/Size: XL, L Bontrager Line Dropper, 200mm travel, MaxFlow, internal routing, 34.9mm, 515mm length
- Saddle
- Verse Short Comp, steel rails, 145mm width
- Handlebar
- Bontrager Line Pro, OCLV Carbon, 35mm, 27.5mm rise, 780mm width
- Rear Derailleur
- Shimano XT M8250, long cage
- Rear Tire
- Size: S Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40"/Size: XL, L, M, ML Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40"
- Stem
- Bontrager Line Pro, 35mm, Blendr compatible, 0 degree, 35mm length
- Brakes
- Shimano XT M8200 4-piston hydraulic disc
- Fork
- RockShox Pike Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44mm offset, Boost110, 15mm Maxle Stealth, 130mm travel
- Frame
- OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120mm travel
- Shifters
- Shimano XT Di2 M8250, 12 speed
- Tape/Grips
- Trek Line Elite, lock-on
- Color
- Dark Star
- Size
- X-Large
- Wheel Size
- 29-inch
- Cassette/Freewheel
- Shimano XT M8200, 10-51, 12 speed
- Rotors
- Shimano RT86, 6-bolt, 180mm
- Wheel Set
- Front Wheel: Size: S Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 27.5"/Size: XL, L, M, ML Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15mm thru axle, 29'' Rear Wheel: Size: S Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 27.5"/Size: XL, L, M, ML Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 29''
- Front Tire
- Size: S Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40"/Size: XL, L, M, ML Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40"
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.