I had 18s on my touring (thread gone up in previous cars section), afaik they were 18 x 8.5, running 235s on the back, 225s on the front. Andres might recall the offset. The car was dropped pretty low they never rubbed on the front and gave full lock. The back however rubbed on the inside of the arch but tbh only when the car was fairly well loaded or hitting a fairly hefty bump. IMO they filled the arches perfectly but the right 17s do a fine job too.