235/265 should be fine. The issue is when you have different rolling diameter front and rear-- the DSC compares the wheel speeds and thinks you're slipping, cuts in.
I'm pretty sure you could sell the ZCP wheels, buy 17s, and come out even. After that, you're in the money. The last set of 275 wide 17" NT-01s I bought were $100/tire, shipped.
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2005 M3 Coupe, 2004 M3 Wagon, 2001 M5 Sedan, 2008 M5 6MT Sedan, 2012 128i M sport
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