08 SS need tires
#11
But the stock tires are 225x45x18 are they not? These are the same height just wider.
#13
#14
Wider also means taller, as the 45 measurement is not a predetermined size. 45 is the aspect ratio, meaning total sidewall height is equal to 45 percent of tread width. Therefor using a 225/45/18 tire would be 225x.45=101.25mm of overall sidewall height. Using a 235/45/18 tire would be 235x.45=105.75, or an overall height increase of 4.5mm along with a 10mm tread width increase.
#15
Wider also means taller, as the 45 measurement is not a predetermined size. 45 is the aspect ratio, meaning total sidewall height is equal to 45 percent of tread width. Therefor using a 225/45/18 tire would be 225x.45=101.25mm of overall sidewall height. Using a 235/45/18 tire would be 235x.45=105.75, or an overall height increase of 4.5mm along with a 10mm tread width increase.
Still nothing can tell me for sure if a 245 40R/18 or a 235 40R/18 tire will fit on my 7.5" rim without issue.
Maybe I should not take the risk and just stick with the stock size
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