A bicycle, also called a bicycle or a wheelbarrow, is a man-powered or motor-powered engine, on a bicycle, on a single track, with two wheels attached to the frame, one behind the other. A cyclist is called a cyclist, or a cyclist.

Bicycles were introduced into 19th-century Europe, and by the beginning of the 21st century, they were over 1 billion at a time. These numbers greatly exceed the number of vehicles, both in total and are calculated by the number of individual models produced. They are the main route for travel in many regions. They also offer a popular form of entertainment, and have been adapted for use as children's toys, general strength, military and police use, courier services, cycling and cycling titles.


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The basic shape and configuration of a typical upright or "safety bicycle", has changed little since the first chain-driven model was developed around 1885. However, many 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 many types of cycling.

The bicycle's invention has had an enormous effect on society, both in terms of culture and of advancing modern industrial methods. Several components that eventually played a key role in the development of the automobile were initially invented for use in the bicycle, including ball bearings, pneumatic tires, chain-driven sprockets and tension-spoked wheels.

Although bike and cycle are used interchangebly to refer mostly to 2 types of 2 wheelers the terms still vary across the world. In India for example a cycle refers only to a 2 wheeler using pedal power whereas the term bike is used to describe a 2 wheeler using internal combustion engine or electric motors as a source of motive power instead of motorcycle/motorbike.








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