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I drove an E92 M3 track preped on 285/30/18 square at PMP last week on RE-71RS. 10” RIMs. I drove an E46 M3 track prepped on 275/35/18 square at LRP on 10” rims.
In my opinion a setup to try will be 265/35/18 front and 275/35/18 Rear.
I do not belive that the 30 series tires will be faster than 35. I also think but not tested that the 265/35/18 front - 275/35/18 rear will be more balanced setup.
My .02
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