Old 05-20-10, 06:05 AM
  #4  
bikegeek57
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ruler is measuring pin to pin external to the chain links?
tool is measuring inside the link -- roller to roller/pin to pin? I would think if the rollers are worn it will be wider between pins as there is less roller there due to wear. that's how I see this happening. I use the tool as I don't have a metal ruler and wooden ones are not very accurate. it's all relative anyway.
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