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History
Single-speed bicycle
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A single-speed bicycle is a type of bicycle with a single gear ratio. These bicycles are without derailleur gears, hub gearing or other methods for varying the gear ratio of the bicycle.
The Flying Pigeon PA-02, a single-speed utility bicycle, is the most produced bicycle model in history.
The Flying Pigeon PA-02, a single-speed utility bicycle, is the most produced bicycle model in history.
A single-speed mountain bike. The frame was modified by replacing the rear drop-outs with track fork ends to allow the chain to be tensioned.
A single-speed mountain bike. The frame was modified by replacing the rear drop-outs with track fork ends to allow the chain to be tensioned.
Racing bicycle, once equipped with multiple gears and derailleurs, converted to single speed. Note the semi-horizontal drop-outs, and redundant second
Racing bicycle, once equipped with multiple gears and derailleurs, converted to single speed. Note the semi-horizontal drop-outs, and redundant second chainring.
Spring-loaded chain tensioner
Spring-loaded chain tensioner
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)
Shimano 600 front derailleur (1980)
Campagnolo Super Record rear derailleur (1983)
Campagnolo Super Record rear derailleur (1983)
Shimano XT rear derailleur on a mountain bike
Shimano XT rear derailleur on a mountain bike
Pulley wheels for a rear derailleur
Pulley wheels for a rear derailleur