Quote:
Originally Posted by dkl
Not really...if the sidewall heights are different, that would also make the overall circumference to be different as well.
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Overall diameter is what is important with regard tire sizes front and back. For example, the Yokohama tires that would fit my X are the Advan S/T's. Fronts are 255/
50/19 and rears are 285/
45/19. Although both have different side wall numbers, the tires have the same exact diameter of 29.1 inches. You can check that on Yokohama's website.
However, my e36 runs M3 reps with sizes 225/
45/17 front and 245/
40/17 rears. In this case, my Toyo Proxes 4's have an overall diameter of 25.1 front and 24.7 rear.
For comparison, my front tire (225/45/17) does not have the same overall diameter as the same tire in size 245/45/17 even though their sidewall number is the same.
I was just trying to let the OP know that just because two tires of different widths have the same sidewall number, does not mean that they have the same overall diameter.
Also, keep in mind that a tire from manufacturer A may not have the same overall diamter as the same size tire from manufacturer B.