Whether you're cruising the local trails or simply enjoying streets and bike paths for fitness and fun, the 3900 Disc is the perfect ride. Trek's White Series aluminum frame is light, tough and responsive, and you'll love the bump-busting 100mm-travel suspension fork. This sweet machine boasts an easy-pedaling 24-speed drivetrain that makes easy work of the hills and powerful mechanical-disc brakes to perfectly modulate your speed. The 3900 will bring you cycling joy for years to come.