I am running 265/35/18 ZI Starspecs on 18x10 TE37 on my RS4, and I am ready to order new tires for track season. I have a single 275/35/18 ZI that I test fit and I have just enough clearance on the inside against the knuckle to make it work. How does the actual width compare on ZI vs ZII? I would like to go with the 275 if possible, but if it is wider than the ZI by any significant amount, it will not work. Anyone have experience with this?