
A tricycle is a vehicle with three wheels. It can be also called a trike. Tricycles can have pedals, an electric motor or a petrol engine.
Use of tricycles by children is most common, but adult tricycles are becoming more common.
Adult tricycles have a chain, gears and are usually recumbent (the feet are in front of the body). They come in two main styles: tadpole with two wheels up front and one in back and delta with two wheels in the back and one wheel in the front. Almost always, the front wheel or wheels steer the bike, and power goes to the back wheel or wheels.

Some tricycles are fully faired (covered in a shell to cut wind resistance); these are called velomobiles.
Other tricycles are built to carry cargo or passengers (also called a cycle rickshaw or pedicabs).
Three-wheeled versions of motorcycles also exist, and some people prefer them for better balance or more room.