TREK Top Fuel 9.8 XT Di2 Gen 4  (2026)

Top Fuel 9.8 is the carbon trail bike for those who want to go fast everywhere: light on the climbs, lightning-fast on accelerations and confident when the trail gets technical.

The OCLV carbon frame is paired with a RockShox suspension package, 120mm rear / 130mm front with a Pike Select+ fork and Deluxe Ultimate shock , to tackle roots, rock gardens and rough sections with total control. The Shimano XT Di2 12-speed wireless drivetrain delivers ultra-fast, precise and quiet shifting, even under load.

Want an ultra-light Top Fuel ? Choose weight-focused components and a 120mm fork to maximize efficiency and responsiveness. Prefer versatility and confidence on descents? Opt for a 140mm fork and an increased 130mm rear suspension to expand your range on more aggressive trails.

Thanks to clearance for a longer dropper post and compatibility with MX wheels , you can customize your Top Fuel 9.8 and turn it into the ultimate trail bike , perfect for fast marathons, long alpine rides and technical outings with friends.

TECHNICAL SPECIFICATIONS

FRAMESET

• Frame: OCLV Mountain Carbon, internal storage compartment, tapered head tube, guided internal routing, downtube protection, alloy rocker link, 4-position Mino Link, ABP, Boost148, 120mm travel

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

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

WHEELS

• Wheel Front:

  • S: Bontrager Line Comp 30, Tubeless Ready, 6-bolt, Boost110, 15 mm thru-axle, 27.5"

  • M, ML, L, XL: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12 mm thru-axle, 29"
• Wheel rear: 
  • S: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12 mm thru-axle, 27.5"
  • M, ML, L, XL: Bontrager Line Comp 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano Micro Spline freehub, Boost148, 12 mm thru-axle, 29"

• Tyres:

  • S : Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120tpi, 27.5x2.40"
  • L - M - ML - XL : Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120tpi, 29x2.40" // Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120tpi, 29x2.40"

DRIVETRAIN

• Crankset: Shimano XT 8200, 30T, 55mm chainline, 170mm length

• Chain: Shimano XT M8100, 12-speed

• Cassette: Shimano XT M8200, 10-51, 12-speed

• Rear Derailleur: Shimano XT M8250, long cage

• Brake: Shimano XT M8220 4-piston hydraulic disc // Shimano XT M8220 4-piston hydraulic disc

COMPONENTS

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

• Seatpost:

  • S : Bontrager Line dropper seatpost, 100mm travel, MaxFlow, internal cable routing, 34.9mm, 310mm length
  • M - ML : Bontrager Line dropper seatpost, 170mm travel, MaxFlow, internal cable routing, 34.9mm, 450mm length
  • L - XL : Bontrager Line dropper seatpost, 200mm travel, MaxFlow, internal cable routing, 34.9mm, 515mm length

• Handlebar: Bontrager Line Pro, OCLV carbon, 35mm, 27.5mm rise, 780mm width

• Grips: Trek Line Elite, lock-on

• Brakes: Shimano XT M8220 4-piston hydraulic disc // Shimano XT M8220 4-piston hydraulic disc

WEIGHT

• Weight: M - 14.00 kg / 30.86 lbs (with TLR sealant, no tubes)
• Weight limit: This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).

The manufacturer reserves the right to make changes to the product information on the website at any time without notice, including data relating to equipment, specifications, models, colours, materials and prices. Due to supply chain issues, compatible parts may be replaced at any time without notice.