In the past, unicycle wheels were made of wood, ranging from large to small. The smaller one is flat; The larger one is higher than the wheel, and the wheel is divided into left and right sides, which can be used to carry objects or sit people, but both sides must be balanced. Between the two handlebars, hang a "car trip". When driving, put it on the shoulder and hold the handlebars with both hands to help. Generally, a unicycle is pushed forward by one person, but there are also large unicycles for carrying things. There are two handlebars at the front and back, which are called "second handlebars".