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I don’t know if ithis exactly answers your question, but in the past I have measured the wheel from center of axle to the fattest part of the tire, and taken the same measurement from the center of the dropout along the chainstay and marked the chainstay. Then measure width of the tire then the distance between chainstays at the mark and compare. If the tire is not mounted, there is plenty of information out there on width of various tires on various rims.
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