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cog (noun) one of the teeth projecting from the rim of the cogwheel.

The teeth on the rim of a bicycle chain wheel or cogwheel are the cogs. The chain wheel or the cogwheel of the bike is the wheel to which the crank and the pedals are attached. As the chain wheel turns, the cogs engage the holes between the links of the chain, and make the wheels move.

  • The bicycle moves because the cogs engage the chain as it turns when the bicycle is pedaled.
  • The cogs and the chain are crucial in imparting motion to the bike.
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Last Modified : 11-May 2009
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