Bicycles, also known as bicycles or bicycles, are usually small land vehicles with two wheels. After riding the car, it is a green and environmentally friendly vehicle driven by stepping on the pedal. In Mainland China, Taiwan and Singapore, they are often referred to as "bicycles" or "bicycles"; In Hong Kong and Macao, it is usually called "bicycle" (in fact, it is usually called in Cantonese); In Japan, it is called "self transfer". There are many kinds of bicycles, including single-person bicycles, double-person bicycles and multi-person bicycles.

James Finley Scott, a student at the University of California in the United States, was the first person to convert an ordinary bicycle into a mountain bike. After that, cross-country sports gradually became popular in Europe and America, and formed competitions. The International Cycling Union recognized this sport in 1990 and held the World Cup for the first time in 1991.