245/40/18 fits without rub on Z4 Ms on stock camber. I fit a set on 18" x 8.5" ET 35 (not Apex, sorry) up front at stock camber settings and it works just fine. For an OE fit without stretching tires, the 8.5" ET35 is the most ideal fit.
245/40/18 also fits fine without rub on 18" x 9" ET 30, although I can't say without camber. That's what I'm running right out on my spare set of OE rears up front at -3º camber. Tires are stretched enough where if I were to drop the tire with wheels on a flat ground, it would contact the rim. 255 would be a better size to run to afford some minor protection to the rim.
Say hi to Eddie for me, I had dinner with him and Patrick about a month ago at Buttonwillow.
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