Originally Posted by
MileHighMark
Yes, but if you always use the same rims, you've eliminated that variable. For example, I have a 700x37 Conti that measures 34mm wide, and a 700x32 Vittoria that's 33.5mm. Both were mounted on the same rim, and inflated to their respective max psi. That discrepancy is not due to the rim(s), but the fact that one company's tire is undersized.
...or they made their width claims based in different rim widths. I know I'm splitting hairs here, but if a rim exists on which the Conti 700x37 measures 37mm wide, then arguably it isn't undersized.