Trek Top Fuel 9.8 Gen 4 - Red Serpentine

The Trek Top Fuel 9.8 is a lightweight OCLV Mountain Carbon trail bike engineered to excel on technical climbs while delivering playful, rowdy confidence on singletrack descents. Designed with Trek's active Active Braking Pivot (ABP) suspension and a versatile 4-way Mino Link chip adjustability, this build pairs 130mm of refined rear travel with a 140mm RockShox Pike Ultimate fork. Featuring Shimano's wireless electronic XT Di2 12-speed drivetrain, 4-piston XT hydraulic brakes, and size-specific wheel configurations, the Top Fuel 9.8 strikes an ideal balance between cross-country efficiency and all-mountain capability.

Specifications

Frameset & Adjustable Suspension Kinematics

• Frame: OCLV Mountain Carbon chassis with integrated down tube storage compartment, fully internal guided cable routing, down tube guard, alloy rocker link, 4-way Mino Link geometry adjustment chip, Active Braking Pivot (ABP), Boost 148x12mm rear spacing, 120mm–130mm rear wheel travel.

• Fork: RockShox Pike Ultimate, DebonAir+ air spring, Charger 3.1 RC2 damper, tapered steerer tube, 44mm offset, Boost 110x15mm Maxle Stealth thru-axle, 140mm travel.

• Rear Shock: RockShox Deluxe Ultimate RCT, 185mm x 55mm trunnion setup.

• Headset: Integrated cartridge bearing layout (1-1/8" top, 1.5" bottom).

• Frame Accessories & Storage: Frame integrated internal frame storage system; includes Bontrager TLR rim strips and 180 ml (6 oz) Bontrager TLR sealant.

Drivetrain & Wireless Electronic Shifting (Shimano XT Di2 1x12)

• Shifter: Shimano XT Di2 M8250, 12-speed wireless electronic controller.

• Rear Derailleur: Shimano XT M8250, 12-speed, long cage design.

• Cassette: Shimano XT M8200, 12-speed, 10-51T ultra-wide range.

• Chain: Shimano Ultegra/XT M8100 12-speed.

• Crankset: Shimano XT 8200, 170mm arm length, 55mm chainline layout.

• Chainring: 30T direct-mount ring (Min: 30T / Max: 34T chainring capacity).

• Bottom Bracket: Shimano BB-MT501 BSA threaded shell.

Brakes & Trail Control

• Brake Calipers: Shimano XT M8220 4-piston hydraulic disc brakes.

• Rotors: Shimano RT86 6-bolt rotors; 180mm front / 180mm rear (Frame supports up to 200mm maximum rear rotor size).

Wheels, Hubs & High-Traction Rubber

• Wheelset: Bontrager Line Comp 30, Tubeless Ready, 6-bolt disc mounts, 110x15mm Boost front / 148x12mm Boost rear spacing with Bontrager Switch removable lever thru-axle. Rapid Drive 108 high-engagement rear hub with Shimano Micro Spline freehub body.

  • Size S: 27.5" Front & Rear wheel setup.

  • Sizes M, ML, L, XL: 29" Front & Rear wheel setup.

• Front Tyre Sizing:

  • Size S: Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 TPI, 27.5" x 2.40".

  • Sizes M, ML, L, XL: Bontrager Montrose RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 TPI, 29" x 2.40".

• Rear Tyre Sizing:

  • Size S: Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 TPI, 27.5" x 2.40".

  • Sizes M, ML, L, XL: Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 TPI, 29" x 2.40".

• Maximum Tyre Clearance: Frame accommodates up to 29" x 2.50" rear tyre volume.

Cockpit & Finishing Kit

• Handlebar: Bontrager Line Pro, OCLV Carbon construction, 35mm clamp diameter, 27.5mm rise, 780mm width.

• Stem: Bontrager Line Pro, 35mm bar clamp diameter, Blendr accessory integration compatible, 0-degree rise, 35mm length.

• Grips: Trek Line Elite lock-on grips.

• Seatpost: Bontrager Line Dropper with MaxFlow internal routing actuation, 34.9mm diameter.

  • Travel breakdown by size:

    • S: 150mm travel (410mm total length)

    • M, ML: 170mm travel (450mm total length)

    • L, XL: 200mm travel (515mm total length)

• Saddle: Verse Short Comp, steel rails, 145mm width.

Weight Ratings & System Limits

• Complete Bike Weight (Size M): 13.48 kg / 29.72 lbs (setup tubeless with sealant, no tubes).

• Maximum System Weight Limit: 136 kg (300 lbs) combined weight limit (includes rider, bicycle, and all equipped gear/cargo).