Mongoose&reg; Boys' Griffin 24" 21-speed Mountain Bicycle. Shimano Rear Derailleu Steel frame stands up to rugged terrain 24" alloy wheels with alloy rims and mountain tread tires offer a smooth ride Linear pull/V brakes. Shimano rear derailleur provides fast, smooth shifting Full suspension fork. Twist shifter controls Mountain handlebars. Padded seat provides comfort while he rides. Integrated kickstand