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derailleur gears
Derailleur gears are a variable-ratio transmission system commonly used on bicycles, consisting of a chain, multiple sprockets of different sizes, and a mechanism to move the chain from one sprocket to another. Although referred to as ''gears'' in the bike world, these bicycle ''gears'' are technically ''sprockets'' since they drive or are driven by a chain, and are not driven by one another.
Modern front and rear derailleurs typically consist of a moveable chain-guide that is operated remotely by a Bowden cable attached to a shifter mounted on the down tube, handlebar stem, or handlebar. When a rider operates the lever while pedalling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets.
For more information about the choice of particular gear ratios and sprocket sizes, see Bicycle gearing.
==Etymology==
''Derailleur'' is a French word, correctly spelled ''dérailleur'',〔 derived from the derailment of a train from its tracks. Its first recorded use was 1930.〔〔(【引用サイトリンク】 derailer: The word you've entered isn't in the dictionary. )〕 At least one notable bicycle industry author has attempted to promote the anglicized spelling of ''derailer''.〔 As of 2013, however, neither Merriam-Webster〔 nor the Oxford English Dictionary〔 have an entry for ''derailer''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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