I'm putting 225-40-18 on the front and 225-45-18 rear on Sunday for the winter. That keeps the same overall diameter in the rear. Personally, I think Chrysler is stupid for recommending putting 225-40-18 on the rear, being that it's the wrong diameter and introduces speedometer error, which also introduces odometer error. I would rather my warranty didn't run out 4% quicker. Maybe they did it so that you can rotate them? Big deal, most tires are directional, so you can only rotate front - rear anyway. If you wear out the rears replace them, keep the fronts. I'm ranting and I don't even know why... Anyway, I'll post a pic after I mount them if you'd like.