Schwinn Solution FS AL Boy's Mountain Bike (24-Inch Wheels) 21-speed, 24-inch mountain bike at home both on the trail and in the city Hand-built trail-tuned Schwinn 7005 aluminum frame RST Omni 191 C5 front suspension fork provides a smoother ride over rough terrain Suntour XR170, 24/34/42-teeth crank SRAM MRX grip shifters, MTB riser handlebar and stem