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| | Bicycle |
 | | It sports a drop handlebar and thin tires and wheels for efficiency and aerodynamics]] mountain bicycle features oversized tires, lights, a sturdy frame, front shock absorbers, and handlebars oriented perpendicular to the bike's axis]] A bicycle, or bike, is a pedal-driven land vehicle with two wheels attached to a frame one behind the other. |
 | | In the late 1990s, disc brakes appeared on some off-road bicycles and on tandems, but are considered impractical on road bicycles, which rarely encounter conditions where the advantages of discs are significant. |
 | | Clown bikes are designed for comedic effect or stunt riding, and usually are directly geared, with no freewheeling, so that they may be pedaled backwards. |
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