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Roller Bearing
From WikiPedalia
A bearing that uses cylindrical or conical rollers instead of balls. The major bicycle application of roller bearings is in some headsets. Roller-bearing headsets are very long-lasting, due to the greater contact surface area as opposed to ball bearings. Current units, however do not turn as freely as ball bearing headset. due to the use of cylindrical rollers, rather than conical rollers. Cylindrical rollers do not naturally roll in a circle, but in a straight line.
Roller bearings also are used in some pedals and for the planet pinions of some internal-gear hubs.
