I don't have any first hand experience with this but I did look into it a bit. The 225s are at the limit of what most manufacturers recommend with a 7" rim. In fact they are already outside what most say. Having said that, I have come across people claiming to run up to 245s with no issues. Your grip would improve but turn in is apparently a bit more vague. You may also want to run more tire pressure than stock. But please don't take my word for anything more than speculation because, like I said, I haven't tried it.