A bicycle is a two-wheeled vehicle propelled by the rider. The earliest design dates from about 1790. Karl von Drais of Germany developed an improved version in about 1816. An Englishman, James Starley, demonstrated the first successful chain drive in 1871.
Bicycles have been a popular means of transport and recreation in many countries since the late 1800s. Some modern bicycles feature recent innovations such as disk brakes, front fork suspension, and the use of carbon fiber to add strength while reducing overall weight.