A bicycle is a two-wheeled, steerable machine propelled by its rider; the bicycle is said to be the most efficient means yet devised to convert human energy into propulsion. First made in the early 19th century, it developed as an important means of transportation and as the basis for a world-wide sport and industry. Bicycles are the most numerous road machines in many countries. Bicycles "touring" - travelling or sightseeing - is most widely practised in England but has a large and increasing number of followers in Germany, France, and other ....