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    4. what is derailer
    what is derailer

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    +1  Views: 551 Answers: 1 Posted: 12 years ago
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      Most bicycles today use derailer or derailleur (fr) gearing systems.  Gear shifting is accomplished by leading the chain from one sprocket to another.


      Derailers look complicated, but they are actually very simple, brute-force devices.


       

      12 years ago. Rating: 2
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