A unicycle is a pedal vehicle. It is like a bicycle, but it has only one wheel. It has a seat and pedals, but no chain or gears. There is no handlebar, it is steered by gripping the seat with the legs and twisting the body. A rider keeps their balance by moving their arms, and controlling their speed. It is usually used for acting and performing. A unicycle is more expensive than a cheap bicycle, because unicycles are far less common.