page_title: Bicycle drivetrain systems
section_title: Speed and torque conversion
hierarchical_section_title: Bicycle drivetrain systems / Speed and torque conversion
caption_attribution_description: English: Ordinary bicycle, Skoda Museum, Mlada Boleslav, Czech RepublicPolski: Bicykl, Skoda Muzeum, Mlada Boleslav, Czechy.
context_page_description: 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.
context_section_description: A cyclist's legs produce power optimally within a narrow pedalling speed range. Gearing is optimized to use this narrow range as best as possible. Bicycle drivetrain systems have been developed to convert speed and torque by a variety of methods.
caption: A penny-farthing with direct drive
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