SE Bikes Adventure 21-Speed V Hard Tail Mountain Bicycle Main frame: SE 1 alloy, with semi-integrated headset, water bottle mount Shifters: Shimano Tourney Revo Shift, 21-speed Tires: Kenda K-922, 22 tpi, 26 x 1.95 Crank set:, 48/38/28T, 7-speed Fork: 50mm travel