Trek's X-Caliber 9 features a light aluminum frame with G2 Geometry for the best riding position on fast climbs, tricky descents and high-speed corners! Leading the charge is a RockShox fork. The durable parts package continues with stiff, speedy Bontrager wheels, a precise Shimano drivetrain & rear derailleur for quick shifts, and powerful Shimano disc brakes renowned for their incredible feel and reliability. Smaller frame sizes use the benefit of a 27.5" wheel instead of a 29", for better fit. Color subject to change.