Originally Posted by
alan s
The tire bead size is usually very accurate, but the tire width, which the OP is primarily concerned with, and the tire height, can vary based on tire design, manufacturing tolerances and rim width/design. The OP is asking a question that is really not answerable, as none of the variables are known.
Awww...come on! Guess!
The rim width is the biggest factor in how wide a tire mounts. The thinner the rim, the thinner the inflated tire width. So that's a big variable.
But some manufactures don't even get close. (Continental, I'm looking at you. Great tires...but you guys don't know how to use a ruler to save your lives)