Back Transmissió de bicicleta Catalan Transmisión de bicicleta Spanish Trasmissione (bicicletta) Italian 変速機 (自転車) Japanese Drivverk (sykkel) NB Układ napędowy roweru Polish
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.
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