Three-speed bicycle
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The three-speed bicycle[1] is a bicycle that uses internal hub gears at the rear wheel hub to provide three gear ratios.
Three-speed hubs have been in use since the early 1900s. Though they are heavier than comparable derailleur systems, internal-gear hub systems generally last longer and require less maintenance.
Description
Typically, in low gear, the rear sprocket turns faster than the wheel; in middle gear, the rear sprocket turns at the same speed as the wheel; in high gear, the rear wheel turns faster than the sprocket.
Use
During their heyday, three-speed hubs were used in all applications, including racing and time trialling, cargo cycling, utility cycling, and commuting. In many parts of the world, three-speed hubs are still preferred for commuting and other types of utility cycling over derailleur systems.
References
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