I just didnt want to get all technical... I was explaining how you figure the numbers. The link I posted from Discount Tires has pictures..
BTW with 18's on a P11 the 215/40 will be a little smaller than the stock diameter which is 24.2".
225/35/18 is a perfect match, but I went with 225/40/18's for a little added support. This was mainly because I first had 215/35/18's (rubber bands, lol) and ruined 2 wheels. I was gonna go w/ the 225/35 but figured I might as well get the added protection.
Next tires I get will be the 225/35's though.
