Quote:
Originally Posted by Cal@Sonic MS
The 1M should have the same fitment spec as E9X M3. So a 18x9.5 or 18x10 square with 275/35/18 should fit with minimal issues.
I have not tried it personally on the 1M so I cannot guarantee but we have fitted 285/35/18 square on 18x10.5 HRE R40s on E92 M3 before with some minor fender work.
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I'll pass this info along.