Main Page | See live article | Alphabetical index The component of a bicycle responsible for converting the reciprocating motion of the rider's legs into the rotating motion used to turn the rear wheel. It is connected to the rider by the pedalss, to the bicycle frame by the bottom bracket, and to the rear sprocket, cassette or freewheel via the chain. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.