SE Bikes Big Mountain 24-Speed D Hard Tail Mountain Bicycle Main frame: SE 1 Double Butted alloy, semi-integrated Fork: HL 595SAMS 29, 100mm travel Crank set: Wheel Top, 42/34/24T, 8-speed Shifters: Shimano EF-40 EZ-Fire, 24-speed Brake set: Mechanical disc, 160mm rotors