You are correct, tire sizes are not well standardized. Even within a single manufacturer's line of products, two models of tires can be listed as the same size but measure differently in real life. And then there are also manufacturing defects with tires being lopsided or bead to tight or loose.
Mtbr's 2016 Winter Biking GearReviews and Roundups
Results 1 to 1 of 1
Thread: Need help with my tire rubbing