On 10/23/2013 10:03 PM, Patrick Moore wrote:
The problem with this analysis is that the tire calculation is based
on width, not height. Height is also very much affected by rim width:
a narrower rim will give you a taller but narrower tire.
FWIW, a 22 mm 559 tire measures just about 24" in diameter while a
true 35 mm one is about 25", very narrow rim, although 25-22 = only 3.
Likewise, on the same very wide rim, the 55 mm (measured; labeled 50)
Furious Fred is 28.5" while the 61 mm (labeled 60) Big Apple Liteskin
is 20.25" in diameter: 3/4" overall while the 60-50 route gives you 10
mm.
Best to get empirical measurements.
Is there really that much variation in the width of 650B rims?
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