Quote:
Originally Posted by DavyNM
also.. the original BMW 18" wheel is 7.5 wide with 225 tires... 235 is okay, but 245 is a little bit too wide. 
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Yep 7.5" is too narrow to be putting a 245 on. Yes I'd go with a 235/50/18. It's only a 1.4% change in circumference (well under the recommended max of 3%) and there seems to be a decent selection on Tire Rack.