Columbia K3M Kanyon 26-Inch Hardtail Men's 24-Speed Mountain Bike Lightweight AL6061 aluminum frame, deluxe Suntour XCT front suspension fork, and semi-integrated headset for lightweight, long-lasting durability Back and front Tektro Novela mechanical disc brakes stop the bike effectively and smoothly Equipped with quality Shimano components, including 24 speed EZ-Fire Plus shifters, derailleurs, and crankset Double-wall rims mated with aggressive off road 26"x2.1" Kenda Tires; authentic Columbia MTB saddle and premium alloy cage pedals 20-inch frame with a 32-inch standover height fits most riders between 5'10" and 6'3"