Trek Top Fuel 9.9 XTR Gen 4 (2025)

Ideal for you!

You’re looking for a carbon trail bike with a minimized weight, without compromising on performance. You enjoy riding in all conditions, from long alpine climbs, to slaloms between poplars, to fast XC singletracks. For this, you need a bike that can keep up on the climbs and let you unleash yourself on the descents. The lightweight carbon frame and the precise, smooth shifting of a Shimano XTR drivetrain are essential for you.

The technology you get

OCLV Mountain carbon frame with Mino Link 4-way lower shock mount for adjusting geometry and suspension leverage ratio. RockShox Pike Ultimate fork with 130mm travel, DebonAir spring, and Charger 3.1 RC2 damper, rear travel of 120mm thanks to the RockShox Deluxe Ultimate RCT shock. Shimano XTR 12-speed drivetrain, Shimano XTR M9100 hydraulic disc brakes, Bontrager Line dropper post, and Bontrager Line Pro 30 tubeless-ready wheels.

The final word

If you’re looking for a lightweight carbon trail bike that balances high performance with fun handling, choose the Top Fuel 9.8 XTR Gen 4. Its ultra-light frame is enhanced by a 4-way lower suspension mount Mino Link that allows you to take control of geometry and handling behavior. In addition, it features a wireless SRAM XTR drivetrain and an amazing RockShox suspension package.

Why you’ll love it

• Top Fuel Gen 4 offers an extremely light frame, improved frame storage, and increased adjustability for all types of riding.
• The RockShox suspension package with 130mm front travel and 120mm rear travel provides a well-balanced bike, efficient on climbs and fun on descents.
• The 4-way Mino Link simplifies adjusting geometry or leverage ratio based on terrain and riding style.
• The improved BITS bag system integrated into the frame makes it easy to store tools, inner tubes, and snacks.
• Ready for any upgrade, it allows you to install forks up to 140mm, rear shocks with up to 130mm travel, and extra-long dropper posts.

FRAME KIT

• Frame: OCLV Mountain Carbon, internal storage compartment, tapered head tube, internal cable routing, down tube protection, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120mm travel
• Fork: RockShox Pike Ultimate, DebonAir spring, Charger 3.1 RC2 damper, 44mm offset, Boost110, Maxle Stealth, 130mm travel
• Suspension: RockShox Deluxe Ultimate RCT, 185mm x 50mm
• Max fork travel compatibility: 140mm

WHEELS

• Front wheel:
  - Size: S - Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6 bolts, Boost110, 15mm thru-axle, 27.5"
  - Size: M, ML, L, XL - Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6 bolts, Boost110, 15mm thru-axle, 29"
• Rear wheel:
  - Size: S - Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6 bolts, Boost148, 12mm thru-axle, 27.5"
  - Size: M, ML, L, XL - Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, Rapid Drive 108, 6 bolts, Boost148, 12mm thru-axle, 29"
• Rear axle: Bontrager Switch through axle, removable lever
• Tire:
  - Size: S - Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120tpi, 27.5x2.40"
  - Size: M, ML, L, XL - Bontrager Montrose RSL XT, Tubeless Ready, triple compound, aramid bead, 120tpi, 29x2.40"
  - Size: M, ML, L, XL - Bontrager Gunnison RSL XT, Tubeless Ready, triple compound, aramid bead, 120tpi, 29x2.40"
• Tire sealant: Bontrager TLR, 6oz
• Nipple guard: Bontrager TLR
• Max tire size: Frame: 29x2.50", Fork: Consult manufacturer specs

DRIVETRAIN

• Shifter: Shimano XTR M9100, 12-speed
• Rear derailleur: Shimano XTR M9100, Shadow Plus, long cage, max 51T cog
• Crankset: Ethirteen TRS Race carbon, 30T, chainline 55mm, length 170mm
• Bottom bracket: Ethirteen BB20-P, English thread, 73mm length
• Cassette: Shimano XTR M9101, 10-51, 12-speed
• Chain: Shimano Dura Ace/XTR M9100, 12-speed
• Max chainring size: 1x: 34T, min 30T

COMPONENTS

• Saddle: Verse Short Comp, steel rails, width 145mm
• Seatpost:
  - Size: S - Bontrager Line dropper post, 100mm travel, MaxFlow, internal cable routing, 34.9mm, 310mm length
  - Size: M, ML, L, XL - Bontrager Line dropper post, 170mm travel, MaxFlow, internal cable routing, 34.9mm, 450mm length
• Handlebar/stem (integrated):
  - Size: S - Bontrager RSL integrated bar/stem, OCLV carbon, 27.5mm rise, 820mm width, 0-degree rise stem, 35mm stem length
  - Size: M, ML, L, XL - Bontrager RSL integrated bar/stem, OCLV carbon, 27.5mm rise, 820mm width, 0-degree rise stem, 45mm stem length
• Grips: Bontrager XR Trail Elite, nylon lock-on
• Brakes: Shimano XTR M9100 hydraulic disc
• Brake rotor: Shimano RT86, 6 bolts, 180mm
• Disc size: Max rotor size - Frame: 200mm, min 180mm, Fork: Consult fork manufacturer specs

WEIGHT

• Weight: M - 12.63 kg / 27.85 lbs (with TLR sealant, without inner tube)
• Weight limit: This bike has a maximum total weight limit (combined weight of bike, rider, and gear) of 136 kg.

The manufacturer reserves the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colours, materials and pricing. Due to supply chain issues, compatible parts may be substituted at any time without notice. The prices shown are the manufacturer's suggested retail prices.