Hi,
The bicycle is a pedal-driven, human-powered vehicle with two wheels attached to a frame and one behind the other. There are many types of bicycle include utility bicycles, mountain bicycles, racing bicycles, touring bicycles, hybrid bicycles, cruiser bicycles, and BMX. Each types have its own function. For example, the mountain bike is used for mountain road and BMX for extreme cycling.
Source:http://en.wikipedia.org/wiki/Bicycle
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