This Trek FX 2 Disc is a versatile hybrid bike designed for fitness, commuting, and recreational riding. The FX 2 Disc is a sleek, versatile hybrid bike with disc brakes that let you stop with complete confidence, even in the worst weather. You can use it for training, commuting, or just for fun thanks to its lightweight Alpha Gold aluminum frame, 24 speeds, and semi-slick tires that offer high speed on pavement and excellent stability on rougher surfaces. Frame: Lightweight aluminum frame. Brakes: Hydraulic disc brakes provide reliable stopping power in all weather conditions. Speeds: Shimano drivetrain with 18 or 24 speeds. Tires: Semi-slick tires offer stability on uneven terrain and speed on pavement.