Old 06-01-14, 10:37 PM
  #22  
smallpox champ
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Originally Posted by IthaDan
It's 4mm difference between 27" (630mm BSD) and 700c (622mm BSD). Don't know 650b off the top of my head but it's certainly a lot more than a 4mm difference in radius from a 27" wheel.
23mm, I was confusedly talking about 700c
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