I'm running 235's on 18x8.5 et45s, I needed a 5mm spacer up front to clear the struts, and have a 3mm spacer in the rear. 5mm in the back would rub under compression when the car was loaded with stuff. I also have ~ 2.0* of camber up front from the M3 control arms and Dinan camber plates, so keep that in mind as well.
My setup does not rub on the street or the track.
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