Inspection
Frame condition
Inspect the frame, fork, welds, and high-stress areas for cracks, dents, or prior repairs.
Trek
2025 Trek Top Fuel 9.8 XT Gen 4
Value Guide market data · 2025 Trek Top Fuel 9.8 XT Gen 4
12-month trend
22%
Direction and magnitude, not judgment
vs. category average
— %
No category comparison available
Price over time - 2025 Trek Top Fuel 9.8 XT Gen 4
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. 2025
2025$9,300 - $10,800Currently viewing
2024$9,300 - $10,8000% vs. 2025
2023$9,300 - $10,8000% vs. 2025
2022$9,021 - $10,476▼ 3% vs. 2025
2021$9,300 - $10,8000% vs. 2025
2020$9,765 - $11,340▲ 5% vs. 2025
2019$2,930 - $3,402▼ 68% vs. 2025
2018$3,720 - $4,320▼ 60% vs. 2025
2017$2,511 - $2,916▼ 73% vs. 2025
2016$2,418 - $2,808▼ 74% vs. 2025
2011$4,101 - $4,763▼ 56% vs. 2025
2010$2,930 - $3,402▼ 68% vs. 2025
2009$3,069 - $3,564▼ 67% vs. 20252025 Top Fuel 9.8 XT Gen 4 lineup
Overview
About this bike
2025 Trek Top Fuel 9.8 XT Gen 4 value depends on condition, original build, frame material, service history, and current buyer demand.
Specifications
Frameset
- Rear Shock
- RockShox Deluxe Ultimate RCT, 185mm x 50mm
- Frame
- OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, OCLV Next rocker link, Mino 4 link, ABP, Boost148, 120mm travel
Drivetrain
- Groupset
- 2025 Trek Top Fuel 9.8 XT Gen 4
- Crankset
- Shimano XT M8120, 30T, 55mm chainline, 170mm length
- Bottom Bracket
- Shimano BB-MT501 BSA
- Chain
- Shimano Ultegra/XT M8100, 12 speed
- Rear Derailleur
- Shimano XT M8100, long cage
- Shifters
- Shimano XT M8100, 12 speed
- Cassette/Freewheel
- Shimano XT M8100, 10-51, 12 speed
Brakes
- Brakes
- Shimano XT M8120 4-piston hydraulic disc // Shimano XT M8120 4-piston hydraulic disc
- Rotors
- Shimano RT86, 6-bolt, 180mm
Cockpit
- Seatpost
- Bontrager Line Dropper, 170mm travel, MaxFlow, internal routing, 34.9mm, 450mm length
- Saddle
- Verse Short Comp, steel rails, 145mm width
- Tape/Grips
- Bontrager XR Trail Elite, nylon lock-on
Wheels & Tires
- Rear Tire
- Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40'' // Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40''
- Wheel Size
- 29-inch / 27.5-inch
- Front Tire
- Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40'' // Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120 tpi, 29x2.40''
- Wheel Set
- Bontrager Line Comp 30, High Strength 6000 Series Aluminum rim, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano MicroSpline freehub, Boost148, 12mm thru axle, 29''
Pedals
- Pedals
- Sold Separately
Accessories
- Color
- Axinite Flip / Lunar Silver / Matte Dark Web
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.