Thread: valve stem covers and generators
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Old 03-25-10 | 07:48 AM
  #7  
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JohnDThompson
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From: Appleton WI

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Originally Posted by JanMM
There are also generators that run centered on the tread of the tire.
There are also hub generators (aka "dynohub") that have less resistance than either tire-driven type, but it does mean you need to build a wheel around them:

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