Not sure the differences of the non-M, but on my M I fit 275’s with Arc-8 9.5” et35 with a 5mm spacer to clear both the caliper/spokes and the strut spring perch (MCS with short 5” springs that put the perch at the tire shoulder).
Scrub radius was also an issue. I had to shave 3/4” off the rear of the bumper cover and push the fender liner in.
Run square for better tire management.
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