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Bicycle pedal
Animation of a bicycle pedal
A bicycle pedal is the part of a bicycle that the rider pushes with his or her foot to propel the bicycle. It provides the connection between the cyclist's foot or shoe and the crank allowing the leg to turn the bottom bracket axle. Pedals usually consist of a spindle that threads into the end of the crank and a body, on which the foot rests or is attached, that is free to rotate on bearings with respect to the spindle.
The Velocipede, a predecessor to the bicycle, lacked pedals but allowed the crank to be operated by means of a treadle. Pedals were initially attached to cranks connecting directly to the driven (usually front) wheel. The safety bicycle as it is known today came into being when the pedals were attached to a crank driving a sprocket that transmitted power to the driven wheel by means of a roller chain.
