Thread: Bicycle Chain
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Old 04-24-13 | 03:23 PM
  #3  
Airburst
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The details are the number of speeds it's intended to be used with on the rear, generally that's all you need to know until you get to seriously high-end stuff. The fact that it's a 21-speed is irrelevant, what matters is that it's a 7-speed rear.
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