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Bicycle - Wikipedia, the free encyclopedia |
 | | bicycles provide the principal means of transportation in many regions, are a popular form of recreation, and have been adapted for use in many other fields of human activity, including children's toys, adult fitness, military and local police applications, courier services, and cycle sports. |
 | | Bicycle in Victorian Plymouth, with a predecessor of the Starley diamond-frame |
 | | Bicycle manufacturing proved to be a training ground for other industries and led to the development of advanced metalworking techniques, both for the frames themselves and for special components such as ball bearings, washers, and sprockets. |
| en.wikipedia.org /wiki/Bicycle (7500 words) |
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