Curb rash on my STI and bent rims on my 3000GT VR-4 disabused me of any notion that skinny tires on my daily driver is a good idea in the long run. Even the 235/50R18's on my XC70 have gotten bent on occasion navigating the relative moonscape that is Philly streets. Hopefully the 235/60R18's on the XC60 will be more…