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Cam
From WikiPedalia
A mechanical device for converting one kind of motion to another, usually rotary to linear. The main application for cams in bicycle technology is in quick-release mechanisms. As the quick-release lever is rotated from the open to the closed position, the cam built into the pivoting end of the handle applies a push to the quick-release mechanism housing, and a pull to the skewer.
Some internal-gear hubs use cams to change the engagement of pawls, to select different gear ratios.
See also rollercam brake.
