On a bicycle, the cogset or cluster is the set of multiple sprockets that attaches to the hub on the rear wheel. A cogset works with a rear derailleur to provide multiple gear ratios to the rider. Cogsets come in two varieties, cassettes or freewheels, of which cassettes are a newer development. Although cassettes and freewheels perform the same f...
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http://en.wikipedia.org/wiki/Cogset
the set of rear sprockets that attaches to the hub on the rear wheel.
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http://en.wikipedia.org/wiki/List_of_bicycle_parts
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