Thread: I have a couple of questions about bike fit
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Old 07-18-16 | 02:33 PM
  #46  
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noglider
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Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem

Originally Posted by Leisesturm
So I happen to have all three sizes of wheel in my stable, so I just got out the tape measure and went downstairs --

26" wheel with Bontrager 2.0" comfort tire. Total Diameter: 26.75"

700C wheel with Schwalbe Marathon 28mm tire. Total Diameter: 27.5"

27" wheel with Continental 27 x 1-1/8" racing tire. Total Diameter: 27.0"
This shows that overall diameter is not a good way to specify a wheel or tire. That is why the standards organizations changed to specifying bead seat diameter (BSD). Unfortunately, we're stuck using the old terms, for the most part.
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