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Sprocket
From WikiPedalia
A toothed wheel or gear that is part of a chain drive.
The front sprockets are also commonly called chainwheels or chainrings. The term "sprocket" is perfectly correct to refer to either front or rear, but most adult cyclists use this term mainly to refer to the rear sprockets. The use of "sprocket" to refer specifically to a chainwheel is mainly confined to BMX usage.
The rear sprockets individually are also commonly called cogs or gears; as a group they are referred to as a block, cassette, cluster or freewheel.
