i was told by the tire rack that yeah 225 will fit on the stock rim but its a half inch higher cuase the way you diveide the numbers? and my buddy does have 225 they look better than mine and i could buy that they are a 1/2 inch higher, he said if you go with 235/40 vs 45 series that the hight will be the same with better traction mazda just puts 215 on there for ride concerns, but just like in forza more patch equels more grip! not to mention a better look