I look up the recommended tire widths for my 8.5 rims per tire because it varies. But 90% of manufacturers recommend 255 as the max. Bottom line, get at least 9 wide rims for the S197 platform so u can get up to 275 with no problem. I've been contemplating taking a chance on 265/35/20 for my 8.5 rims. It may be just fine. I'm currently on 245/40/20 and it's the perfect height to match 275 to 295. I simply will not ever put 255/35/20 on. Those side walls are just too small for a street car that weighs this much. Plus adding anything on the rear larger than 275 gives too much rake with 255/35 fronts
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