All riders must have a Class M motorcycle license (or a driver’s license with the M endorsement) in order to operate a motorcycle or motor-tricycle on Missouri roads. They must also register the bike with the Missouri Department of Revenue. However, whether you need a license to ride a scooter in Missouri will depend on the size of the scooter’s engine, or cc displacement. The rules for scooters and motorized bicycles depend on engine displacement because they dictate how fast the vehicle can go. Under Missouri law, any two-wheeled or three-wheeled vehicle with an automatic transmission, with a cylinder capacity less than 50 cubic centimeters, and that has a maximum speed of 30 miles per hour may be classified as a scooter or moped. In order to operate these vehicles, you will only need a valid driver’s license; no motorcycle endorsement is legally required.