A bicycle, often called a bike[1] (and sometimes referred to as a "pushbike",[2] "pedal bike",[3] "pedal cycle",[4] or "cycle"[5]), is a human-powered, pedal-driven, single-track vehicle, having two wheels attached to a frame, one behind the other.[6] A person who rides a bicycle is called a cyclist, or bicyclist. Bicycles were introduced in the 19th century and now number more than a billion worldwide, twice as many as automobiles.[7] They are the principal means of transportation in many regions. They also provide a popular form of recreation, and have been adapted for such uses as children's toys, adult fitness, military and police applications, courier services and bicycle racing. The basic shape and configuration of a typical upright bicycle has changed little since the first chain-driven model was developed around 1885.[8] However, many details have been improved, especially since the advent of modern materials and computer-aided design. These have allowed for a proliferation of specialized designs for diverse types of cycling. The invention of the bicycle has had an enormous impact on society, both in terms of culture and of advancing modern industrial methods. Several components that eventually played a key role in the development of the automobile were invented for the bicycle, including ball bearings, pneumatic tires, chain-driven sprockets, and tension-spoked wheels.http://google.com

Add new attachment

Only authorized users are allowed to upload new attachments.

List of attachments

Kind Attachment Name Size Version Date Modified Author Change note
jpg
jspwiki-light-de.jpg 57.9 kB 1 27-Feb-2007 09:56 Kristian Rink
tgz
light-de.tgz 40.9 kB 1 27-Feb-2007 09:55 Kristian Rink
« This page (revision-4) was last changed on 17-Jul-2012 12:41 by manosri