I believe it’s with 15’s. Add 0.7” for 18’s
To further clarify....
225/75/15 tire is 28.3” has 2549# weight rating
255/55/18 tire is 29” has 2271# weight rating
255/45/18 tire is 27” has 1929# weight rating.
For an SA, I would not run the 255/45/18.
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