A gas pocket bike , sometimes called a minimoto or mini bike , is a miniature motorcycle. Most mini bikes use two-stroke engines and chain drive which is evolved into several specialized types. Minibikes are not toys, although often treated as such. The 49 cc pocket bikes can reach speeds of 30 to 45 mph (48 to 72 km/h), and the 110–125 cc four-stroke bikes are capable of 60-80 mph. Gasoline-powered bikes are substantially faster and require more skill than off-the-shelf electric bikes, which typically can not exceed 10 to 15 mph (16 to 24 km/h).