Bicycle drivetrain systems

Bicycle drivetrain systems are used to transmit power on bicycles, tricycles, quadracycles, unicycles, or other human-powered vehicles from the riders to the drive wheels. Most also include some type of a mechanism to convert speed and torque via gear ratios.

A chain drive and rear derailleur gear change, the most popular system in use today
A shaft-drive with crankset and rear gear hub

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This article uses material from the Wikipedia article Bicycle drivetrain systems, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.