I'm running the roadmagnets right now with 18x8 w/ 48 offset wheels on the stock tires. I personally don't know if 225's would fit as the tire right now sits right on the edge of the fender and there is virtually no wheel gap. The only thing keeping the tires from rubbing is the camber of the rear tires. Seeing as you are running 7.5's though, you may be able to get away with some 225's.