Treks Top Fuel 9.9 is their top-of-the-line full suspension mountain bike for endurance racers & multi-discipline riders. This down-country rig is built with an OCLV Mountain Carbon frame & specd to the hilt with high-performance parts, including a Fox Factory 34 Step-Cast fork, a SRAM XX1 Eagle drivetrain, carbon wheels & SRAM Level Ultimate brakes. Top Fuel 9.9 flies through singletrack & rips descents, but it really shines when pushed to its full potential during gruelling endurance races.