How about you check this thread that has tons of info on various wheel offsets, tire sizes, and rubbing? It's a sticky on the wheel and tire sub-forum.
Rub no Rub Index:
http://www.m3post.com/forums/showthread.php?t=522139
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'23 X7
'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc.
INSTAGRAM - @Slicer_M