Trek Top Fuel 9.9 XTR Gen 4 Mountain Bike 2025

Contact the store for latest lead times.

This carbon trail bike prioritizes lightweight design without sacrificing performance. Its versatility allows you to tackle a variety of terrain, from alpine climbs to rooty aspen slalom to fast XC singletrack. The carbon frame offers the perfect balance of weight savings and precise Shimano XTR drivetrain shifting.

The Trek Top Fuel 9.9 XTR Gen 4 Mountain Bike 2025 features an OCLV Mountain Carbon frame with a 4-way Mino Link lower shock mount for adjusting geometry and suspension leverage rate. This is accompanied by a 130 mm RockShox Pike Ultimate fork with DebonAir spring and Charger 3.1 RC2 damper, as well as a 120 mm rear travel provided by the RockShox Deluxe Ultimate RCT shock. The bike also boasts a top-of-the-line Shimano XTR 12-speed drivetrain, Shimano XTR M9100 hydraulic brakes, a Bontrager Line dropper post, and tubeless-ready Bontrager Line Pro 30 wheels.

For those seeking a lightweight carbon trail bike with a balanced and versatile ride, the Top Fuel 9.8 XTR Gen 4 is the perfect option. With its incredibly light frame and 4-way Mino Link lower suspension mount, you can easily control your geometry and suspension feel. Additionally, the Shimano XTR drivetrain and RockShox suspension package provide seamless shifting and optimal performance.

• Frame OCLV Mountain Carbon, internal storage, tapered head tube, internal guided routing, downtube guard, alloy rocker link, 4-way Mino Link, ABP, Boost148, 120 mm travel
  
• Fork RockShox Pike Ultimate, DebonAir spring, Charger 3.1 RC2 damper, 44 mm offset, Boost110, Maxle Stealth, 130 mm travel
  
• Shock RockShox Deluxe Ultimate RCT, 185 mm x 50 mm
  
• *Wheel front    
• Size: S Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15 mm thru-axle, 27.5"
  
• Size: M, ML, L, XL Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless Ready, 6-bolt, Boost110, 15 mm thru-axle, 29"
  
• *Wheel rear    
• Size: S Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless-Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 27.5"
  
• Size: M, ML, L, XL Bontrager Line Pro 30, OCLV Mountain Carbon, Tubeless-Ready, Rapid Drive 108, 6-bolt, Boost148, 12 mm thru axle, 29"
  
• Skewer rear Bontrager Switch thru-axle, removable lever
• *Tyre  
•  Size: S Bontrager Gunnison RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 27.5x2.40"
  
• Size: M, ML, L, XL Bontrager Montrose RSL XT, Tubeless-Ready, triple compound, aramid bead, 120 tpi, 29x2.40"
• Tyre part Bontrager TLR sealant, 180 ml/6 oz
  Rim strip Bontrager TLR
  
• Shifter Shimano XTR M9100, 12-speed
  
• Rear derailleur Shimano XTR M9100, Shadow Plus, long cage, 51-T max cog
  
• Crank E*thirteen TRS Race Carbon, 30T, 55 mm chain line, 170 mm length
  
• Bottom bracket E*thirteen BB20-P, BSA threaded, 73 mm width
  
• Cassette Shimano XTR M9101, 10-51, 12-speed
  
• Chain Shimano Dura-Ace/XTR M9100, 12-speed
  
• Saddle Verse Short Comp, steel rails, 145 mm width
  
• *Seatpost    
• Size: S Bontrager Line Dropper, 100mm travel, MaxFlow, internal routing, 34.9 mm, 310mm length
  
• Size: M, ML, L, XL Bontrager Line Dropper, 170 mm travel, MaxFlow, internal routing, 34.9 mm, 450 mm length
  
• *Handlebar/stem (integrated)    
• Size: S Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5 mm handlebar rise, 820 mm width, 0-degree stem rise, 35 mm stem length
  
• Size: M, ML, L, XL Bontrager RSL Integrated handlebar/stem, OCLV Carbon, 27.5 mm handlebar rise, 820 mm width, 0-degree stem rise, 45mm stem length
  
• Grips Bontrager XR Trail Elite, nylon lock-on
  
• Brake Shimano XTR M9100 hydraulic disc
  
• Brake rotor Shimano RT86, 6-bolt, 180 mm
  
• Bag Bontrager BITS Internal Frame Storage Bag
• Weight M - 12.63 kg / 27.85 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).