Trek Top Fuel 9.8 XT Di2 Gen 4 - Dark Star

This trail-ready full-suspension mountain bike delivers a perfect balance of performance and rugged utility, making it an excellent match for weekend trail exploration, fast-paced singletrack sessions, or a rock-solid daily driver. Equipped with a premium RockShox air suspension package to absorb bumps and trail chatter, this model features an advanced OCLV Mountain Carbon frame with integrated internal storage, a crisp, electronic-shifting 12-speed Shimano XT Di2 drivetrain, and a factory-spec Bontrager Line Dropper seatpost for instant on-the-fly saddle adjustments.

Specifications

Frameset & Suspension

• Frame: OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link adjustable geometry, ABP (Active Braking Pivot), Boost148, 120 mm travel.

• Fork: RockShox Pike Select+, DebonAir spring, Charger 3.1 RC2 damper, tapered steerer, 44 mm offset, Boost110, 15 mm Maxle Stealth, 130 mm travel.

• Rear Shock: RockShox Deluxe Ultimate RCT, 185 mm x 50 mm.

Drivetrain & Shifting (Shimano XT Di2 1x12 Electronic)

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

• Front Derailleur: N/A (1x Dedicated single-ring layout).

• Rear Derailleur: Shimano XT M8250, long cage.

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

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

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

• Crankset Configuration: Shimano XT 8200, 30T ring, 55 mm chain-line, 170 mm length.

• Max Chainring Limits: 1x configuration: Maximum 34T / Minimum 30T | 2x configuration: N/A | 3x configuration: N/A.

Brakes & Rotors

• Brakes: Shimano XT M8220 4-piston hydraulic disc system.

• Rotors: Shimano RT86 6-bolt design ([Front] 180 mm / [Rear] 180 mm).

• Rotor Size Limits: Frame capacities range from a Minimum of 180 mm to a Maximum of 200 mm. For front fork clearances, cross-reference the fork manufacturer guidelines.

Wheels & Tyres

• Wheelset System (Bontrager Line Comp 30, Tubeless Ready, 6-bolt disc, Boost spacing):

  • Size S: 27.5" front and rear wheels (Rear features Tubeless Ready rim, Rapid Drive 108 hub, and Shimano Micro Spline freehub).

  • Sizes M, ML, L, XL: 29" front and rear wheels (Rear features Tubeless Ready rim, Rapid Drive 108 hub, and Shimano Micro Spline freehub).

• Rear Thru-Axle Skewer: Bontrager Switch thru-axle, with integrated removable lever.

• Tyres (Tubeless Ready, triple compound, aramid bead, 120 tpi):

  • Size S: Bontrager Gunnison RSL XT, 27.5" x 2.40".

  • Sizes M, ML, L, XL: Bontrager Gunnison RSL XT or Bontrager Montrose RSL XT options, 29" x 2.40".

• Included Tubeless Spares: Bontrager TLR rim strips and Bontrager TLR sealant (180 ml / 6 oz).

• Max Tyre Clearance: Frame limits at 29" x 2.50" (Note: Size S clearance scales down based on wheel size format). For front fork clearances, cross-reference the manufacturer guidelines.

Cockpit & Components

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

• Grips: Trek Line Elite, lock-on.

• Stem: Bontrager Line Pro, 35 mm clamp, 0-degree rise, 35 mm length (Blendr compatible).

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

• Dropper Seatpost Integration (Bontrager Line Dropper, MaxFlow internal routing, 34.9 mm diameter):

  • Size S: 100 mm travel, 310 mm length.

  • Sizes M, ML: 170 mm travel, 450 mm length.

  • Sizes L, XL: 200 mm travel, 515 mm length.

Sizing, Weight & Performance Limits

• Alpha Sizes Available: S, M, ML, L, XL

• Total Bike Weight: 14.00 kg / 30.86 lbs (Size Medium configuration setup with factory TLR sealant, no inner tubes).

• Weight Limit: This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

Please Note: We make every effort to ensure the accuracy of the specification information, but components are subject to change by the manufacturer at any time without prior notice due to ongoing factory running parts substitutions.