Trek's X-Caliber 9 features a light, butted, hydroformed-aluminum frame with Gary Fisher's G2 Geometry for the best riding position on fast climbs, tricky descents and high-speed corners, not to mention everywhere else! With its steamrolling wheels and fat tires, the X-Cal overpowers obstacles furthering its excellent control and XC efficiency. Leading the charge is a 100mm-travel RockShox fork that eats up obstacles like it was its job. Because it is! The durable parts package continues with stiff, speedy Bontrager wheels, a precise 2x10 drivetrain with an XT Shadow rear derailleur for quick shifts, and powerful Shimano disc brakes renowned for their incredible feel and reliability. Plus, the stem, bars, seatpost and seat from Bontrager are just as capable as the rest of this XC rocket. And with Trek's Smart Wheel sizing, you're riding the fastest wheels with the best possible fit.