Note there is no single fixed definition of a scooter (also known by the full name motor-scooter), but generally a smaller motorcycle with a step-through frame is considered a scooter, especially if it has a floor for the rider's feet (as opposed to straddling the vehicle like a conventional motorcycle). Other common traits of scooters can include: bodywork (so the mechanicals are not exposed like a conventional motorcycle), motors combined with the suspension or wheel (rather than attached to the frame like a conventional motorcycle), leg shields, smaller wheels than a conventional motorcycle, and an alternative to a chain drive.