Miniature motorcycle , mini motorcycle, minimoto, Pocket rocket or pocket bike is a popular racing sport in Japan and Europe . Despite the size, some of these miniature motorcycles can travel up to 65 mph (100 km/h). Pocket bikes are very small (thus the name) usually not weighing more than 50 pounds (23 kg). They range in price from around US$150 dollars to several thousand for a high performance racing model.