Bicycle - Wikipedia
2021-11-15u2002·u2002A bicycle, also called a bike or cycle, is a human-powered or motor-powered, 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, and by the early 21st century, more than 1 billion were in existence. These numbers far exceed the number of cars ...
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