Just finished installing a new set of EC-7RS Forged wheels and Michelin PS4S tires on my 06 Z4M Coupe and I figured it would be worth sharing some pictures of how the fitment turned out!
Here are the wheel/tire specs:
Front: 18x9" ET30 w/ 245/40-18
Rear: 18x10" ET25 w/ 275/35-18
Suspension is completely stock with no rubbing to report while driving or with full steering lock. The front does poke a bit, but I plan to remove the front alignment strut pins to squeeze some more negative camber out of the stock setup to tuck it in a bit until I get camber plates installed.
Rear fitment is perfect at stock ride height. Honestly, there seems to be plenty more clearance to fit a more aggressive 18x10.5" ET22 with a 285/35-18 tire without any fender rubbing issues. That said, the 275's offer plenty of grip as-is, so a wider rear tire wouldn't really be necessary IMO.
Enjoy!
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2011 335i N55/6MT/M-Sport
MHD Stage 2+, VRSF Downpipe, VRSF 7" FMIC, BMS Intake, BMS Chargepipe, Performance Exhaust Mod, F10 550i Clutch, BMS CDV, BMW Performance SSK, M3 Control Arms, ST Coilovers, Apex ARC-8 wheels, Michelin PS4S