I have 18x8.5 with 35mm offset with 225s and I have about 10-15mm strut clearance. I must have made a mistake calculating the fit the 245s on the Kosei's. My thought process was that the Koseis have 40mm (lose 5 mm clearance) and the 245 are 20mm wider (lose another 10mm) I would be rubbing strut.
I guess a 5-10 spacer would be a good investments....specially when I go with 255s in a month or so.
2011 e90 N55 (now 100% stock) & e36 2.8L SCCA ITR race car