Join Date: Oct 2006
Location: northern Florida, USA
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If I recall correctly, the rule of thumb for "what tires will fit on this rim" is to measure the inside width and multiply by 1.4 for the narrowest tire that will work and 2.0 for the widest that will fit without major danger of rolling the tire off. I forget where I saw that, maybe on Sheldon Brown's site.
That's not to say you can't do otherwise, of course...