Top Fuel 9.9 XX1 AXS is our top-of-the-line full suspension carbon mountain bike for endurance racers and multi-discipline riders. This down-country rig is built with the latest in fully wireless components like the SRAM XX1 Eagle AXS drive train and RockShox Reverb AXS dropper. It's also spec'd with high-end RockShox suspension and lots of carbon ? including the wheels, bars and shift levers. You'll fly through singletrack and rip descents on this bike, but it really shines when pushed to its full potential during gruelling endurance races.

You've set your sights on endurance racing, and want every lightweight and performance advantage. You're looking for an efficient yet trail-capable rig that's fast on flats, soaks up rough terrain and has the latest in fully wireless electronic components.

A full OCLV Mountain Carbon frame, top-of-the-line 120 mm RockShox Pike Ultimate fork with plush DebonAir spring and Charger 2 RC2 damper that gives you more adjustment and control. 115 mm of rear travel with a RockShox Deluxe Ultimate shock and a fully wireless 1x12 SRAM XX1 Eagle AXS electronic drive train. Plus, wide carbon Bontrager Kovee Pro 30 wheels with a 108-tooth Rapid Drive hub for instant engagement, TwistLoc dual remote suspension lockout, a wireless RockShox Reverb AXS dropper, Bontrager Kovee XXX OCLV Carbon handlebars and SRAM Level Ultimate brakes with carbon levers.

The Top Fuel 9.9 XX1 AXS is built for speed and capability on any terrain, but its efficient, short-travel design excels in endurance events. An OCLV Mountain Carbon frame, fully wireless drive train and dropper, and top-of-the-line suspension come together for a nimble and insanely fun ride at any distance.
- The SRAM XX1 Eagle AXS drivetrain is smart, smooth and completely wireless
- It?s the ultimate endurance racing bike ? light, capable and trimmed with high-performance components
- TwistLoc simultaneously locks out front and rear shocks for climbs and sprints with the simple Grip Shift-like motion
- This short-travel trail bike gives you a suspension set-up that?s capable in several MTB disciplines, and especially suited to endurance events
- Make it yours: it's fully customisable through Project One

Will my bike have a curved top tube?
Smaller frames (S) have a top tube that dips down as it approaches the seat tube. This design makes for a lower standover height, which is good for shorter riders because it allows them to straddle their bike more easily. The larger frames (M and ML) have a straight top tube because taller riders with longer legs typically don?t have the same issues with standover height.

Active Braking Pivot
Active Braking Pivot allows our 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.

Straight Shot w/Knock Block
Trek's Straight Shot frame design optimises the stiffness-to-weight ratio for a more responsive ride. You'll be able to push harder and stay more planted on your line when the going gets rough.

OCLV Mountain Carbon
Trek's mountain-specific carbon fibre is tougher carbon, with unique materials and lay-up procedures, Trek's advanced engineering, and a higher standard of testing.