Originally Posted by
Iride01
Sure, but you only see the significant differences at the extremes were anyone would obviously see that the tire is not the right size for the rim.
A 28 mm tire should fit anywhere from a 15mm to 19mm rim without reservation. I doubt you see more than a mm of diameter change in those ranges.
I didn't say it would it be a big difference. Different rim widths affect the tire width more, but obviously that changes the height as well. I have a 42mm tire on a narrow 17mm rim, and the tire measures 38c on it but it's pretty tall. If I mounted it on a 22mm rim it would probably measure 42c but the diameter would be smaller.