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Bearing
From WikiPedalia
A bearing is the point of contact between a turning part and a non-turning part. A good bearing assembly has little or no play, and as little friction as possible.
Major bearings on a bicycle are the headset, the bottom bracket and the hubs. There are also bearings in brakes, pedals and freewheels.
Bearings used in bicycles are usually of the cup-and-cone type, but many newer bicycles use cartridge bearings.
