For other uses, see Bicycle (disambiguation).
This article uses American English. See talk page for more
information.
The bicycle, cycle or bike, is a pedal-driven, human-powered vehicle
with two wheels attached to a frame, one behind the other.
First introduced in 19th-century Europe, bicycles now number
approximately one billion worldwide,[1] providing the principle means
of trans****tation in many regions. They also provide a popular form of
recreation, and have been adapted for use in many other fields of
human activity, including children's toys, adult fitness, military and
police applications, courier services, and cycle s****ts.
The basic shape and configuration of a typical bicycle has hardly
changed since the first chain-driven model was developed around 1885,
[2] although many im****tant details have been improved, especially
since the advent of modern materials and computer-aided design. These
have allowed for a proliferation of specialized designs for particular
types of cycling.
The bicycle has had a considerable effect on human society, in both
the cultural and industrial realms. In its early years, bicycle
construction drew on pre-existing technologies; more recently, bicycle
technology has, in turn, contributed both to old and new areas.
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