Read up on what the tire size specs really mean, none of them tell you the overall diameter of the tire or width of the tread, and it will vary with the width of the rim and tire pressure. You can calculate overall tire diameter from the numbers, but it will only be close and will vary for things like tread depth, etc.
What it comes down to, the overall dimensions of tires vary from model to model, so do NOT assume if one size of a certain model of a tire just barely fits, that the same size in another model tire will fit as well. Those overall dimensions vary a small amount and don't make much of a difference except in cases of fitting oversized tires with barely any clearance.
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