This product is a mini dirt bike (Mini Dirt Bike) for children and teenagers. General specifications of the bike: Engine: Usually comes with a capacity ranging from 49 cc to 60 cc (two-stroke, runs on gasoline mixed with oil). Tires: Mountain/desert tires (10 to 14 inches) designed for stability on sand and rough terrain. Starting system: Pull cord (handle) or key start depending on the actual model.