I lot of people tend to run about 4psi more than the factory with their 225/55s. I've been doing that with the factory SC tires/rims and no wear issues. I plan to do the same when I upgrade to the 235/55s.
Just replaced the factory SC tires with general exclaim uhp 235 55 18. Wow, what a difference. Less noise, turn in feels more crisp, and even rides smoother. Being slightly wider and taller they fill the wells better, and now my speedometer is more honest (used to read fast compared to the GPS). No rubbing even on the tightest of turns with stock LX suspension.