Thread: Nervar crank ID - For Velobase
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Old 01-17-12 | 06:51 PM
  #6  
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mkeller234
Rustbelt Rider
 
Joined: Oct 2008
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From: Canton, OH

Bikes: 1990 Trek 1420 - 1978 Raleigh Professional - 1973 Schwinn Collegiate - 1974 Schwinn Suburban

It could definitely be a shifting aid. I can't see another purpose for it really.
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