2026 Trek Top Fuel 9.9 XTR Di2 Gen 4 XC MTB in Dark Star

Top Fuel 9.9: A lightweight carbon trail bike built to rip up climbs and stay playful on descents.

The Top Fuel 9.9 is a lightweight carbon trail bike built to rip up climbs and stay playful on descents. It gives you the confidence you want through roots and rocks thanks to a 120mm rear and 130mm front suspension package with a Fox Factory Float shock. Plus, you get confident, lightning-fast shifting from Shimano's all-new, iconic XTR Di2 wireless drivetrain.

You like to ride everything—long alpine climbs, rooty aspen slalom, fast XC singletrack—and you want a bike that can keep up on the ups and hold its own on the downs. Keeping things light is critical, so you want a carbon frame and the cream of the crop parts, like an all-new, ultra-smooth Shimano XTR Di2 drivetrain.

This bike features an OCLV Mountain Carbon frame with a 4-way Mino Link lower shock mount for tweaking geometry and suspension leverage rate. It has a 130mm fork, plus 120mm of rear travel from a Fox Factory Float. It also includes Shimano's all-new XTR Di2 12-speed drivetrain, Shimano XTR M9220 hydraulic brakes, a Bontrager Line dropper post, and tubeless-ready Bontrager Line Pro 30 OCLV carbon wheels.

If you're after a light carbon trail bike that balances a playful and capable ride, reach for the Top Fuel 9.8 XTR Gen 4. Its ultra-lightweight frame pairs with a 4-way Mino Link lower suspension mount for taking control of your geometry and suspension feel. Plus, you get clean shifts from Shimano's new XTR Di2 wireless drivetrain and a sweet suspension package.

Features:

• You get every performance advantage, thanks to Shimano's iconic XTR Di2 wireless drivetrain and an upgraded suspension package.
• Top Fuel Gen 4 delivers with an intensely lightweight build, improved in-frame storage, and more adjustability for all kinds of rides and riders.
• With 120mm rear and 130mm front suspension, it delivers a well-balanced ride that stays efficient on the ups and playful on descents.
• The 4-way Mino Link makes it easy to adjust your geometry or leverage rate for how and where you want to ride.
• It's more customizable than ever, with room for bigger 140mm forks and longer-stroke shocks for up to 130mm of rear travel, plus room for extra-long dropper posts.
• 4-way Mino Link - Easily adjust the suspension and geometry four different ways for where and how you ride. With the flip of a chip, you can ride with more or less progressive suspension, and tweak your geometry for a slacker head tube and lower BB or steeper head tube and higher BB.
• New Internal Storage with New Bits Bags - New internal frame storage bags make it easy to ditch the pack and still carry your ride essentials.
• Bits: Your Trailside Savior - Cleverly integrated into the steerer tube, the included Bits multi-tool has everything you need for trailside adjustments and repairs.
• Active Braking Pivot - Active Braking Pivot allows engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.
• Shimano XTR Di2 - Get speed-enhancing technology right at the fingertips. XTR Di2 is Shimano's lightest and most robust MTB groupset ever, with lightning-fast shifts and the die-hard reliability you've come to expect from Shimano. Plus, it's now wireless and more customizable than ever.