Old 11-08-12 | 03:14 PM
  #4  
fietsbob
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Joined: Jun 2010
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From: NW,Oregon Coast

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Radius = 1/2 diameter, bead seat is about where the brakes line up
it's measured diameter..

27" standard is 630/2=315 700c is 622 ... 622/2=311.. difference = 4mm

to measure is to know, first hand..
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