Top Fuel 8 is a high-performance, high-value full suspension cross-country mountain bike. It's built for speed and efficiency in rough single-track and XC races. A lightweight Alpha Aluminium frame, Shimano drivetrain and Tubeless Ready wheels make it a great choice for new racers, fast single-track riders and anyone who wants to ride fast on trails without breaking the bank. A lightweight Alpha Platinum Aluminium frame, a 100 mm FOX Rhythm 32 Float fork and a super-efficient FOX Performance Float rear shock engineered specifically for XC racing with Trek's exclusive RE:aktiv damper. Plus, a Shimano SLX 2x11 drivetrain and Boost148/110 Tubeless Ready wheels. Smart Wheel Size, 15.5 has 650b wheels.