Bicycle

A bicycle, or bike, is a pedal-driven land vehicle with two wheels attached to a frame, one behind the other. First introduced in 19th-century Europe, it evolved quickly into the familiar current design. With over one billion in the world today, bicycles provide the principal means of transportation in many regions and a popular form of recreation and transport in others.

References

• All About Bicycling, Rand McNally.
• The New Columbia Encyclopedia
• Richard Ballantine, Richard's Bicycle Book, Pan, 1975.
• Caunter C. F. The History and Development of Cycles Science Museum London 1972.
• Daniel Kirshner. Some nonexplanations of bicycle stability. American Journal of Physics, 48(1), 1980. The abstract reads "In this paper we attempt to verify a nongyroscopic theory of bicycle stability, and fail".
• David B. Perry, Bike Cult: the Ultimate Guide to Human-powered Vehicles, Four Walls Eight Windows, 1995.
• Roni Sarig, The Everything Bicycle Book, Adams Media Corporation, 1997
• {{Web reference | title=Randonneurs USA | work=PBP: Paris-Brest-Paris | URL=http://www.rusa.org/pbp.html | date=March 31 | year=2005}}
• US Department of Transportation, Federal Highway Administration. "America's Highways 1776-1976", pp. 42-43. Washington, DC, US Government Printing Office.
• David Gordon Wilson, Bicycling Science, MIT press, ISBN 0-262-73154-1