Derailleur
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A derailleur is a variable-ratio bicycle gearing system consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another.
Shimano 600 front derailleur (1980)
Campagnolo Super Record rear derailleur (1983)
Shimano XT rear derailleur on a mountain bike
Pulley wheels for a rear derailleur
Bicycle gearing
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Bicycle gearing is the aspect of a bicycle drivetrain that determines the relation between the cadence, the rate at which the rider pedals, and the rate at which the drive wheel turns.
A Rohloff Speedhub hub gear
A Shimano XT rear derailleur on a mountain bike
A bicycle gearbox with chain tensioner
Single-speed mountain bike