With the notable exception of a continuously variable transmission CVT, a transmission — also called a gearbox — is an oil filled metal case that contains a number of gears, shafts, bearings, and other parts. Each gear has a specific ratio to ensure the wheels dont spin at the same speed as the engine. Your mountain bike is equipped with a much more basic version of this technology. On paper, a transmission is simple. Torque from the engine enters the transmission through the input...

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