A bicycle, also called a pedal cycle, bike or cycle, is a human-powered
or motor-powered assisted, pedal-driven, single-track vehicle, having
two wheels attached to a frame, one behind the other. A bicycle rider is
called a cyclist, or bicyclist.
Bicycles were introduced in the 19th century in Europe. By the early
21st century, more than 1 billion were in existence. These numbers far
exceed the number of cars, both in total and ranked by the number of
individual models produced.They are the principal means of
transportation in many regions...
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