Go on Treadepot.com and look. They have a tire/wheel size chart that will show you what size tire will fit on what size rim. Usually a 225 goes on 7.5 or 8" wide rim, but i could be mistaken.
What 225/40-17 tires are you looking at? I don't understand why the dealership would recommend such an odd size. If you stay with 215/45-17or 225/45-17 there are tons of options available.Well, thanks, but my dilemma is if it is better, to put 225/40r17 or 225/45r17