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Bikes Bicycles Transportation Souvenir Sheet of 4 Stamps MNH Congo Birds Parrots Souvenir Sheet of 4 stamps FRESH Mint NH and physics)Bikes Bicycles Transportation Souvenir Sheet of 4 Stamps MNH 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. Bicycles were introduced in the late 19th century in Europe, and by the early 21st century, more than 1 billion were in existence at a given time. These numbers far