A bicycle, also called a cycle or bike, 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.
The Evolution Of The Bicycle
Evolution of the Bicycle
How a Bicycle is Made (1945)
A "Bicycle" Story - A Short Documentary
1818 to 1890s Bicycle Models (from 1915 documentary)