I believe the correct size is 255/55/18? I replaced my MXV's with Nitto 420S in this size and have about 7500 miles on them. I was not a fan of the Michelin's and have been happy with these. They have an aggresive looking tread pattern and cost about 1/2 of what the MXV's. I have read reviews that say they get louder with age... but so did my MXV's. They have also had some not great snow reviews, I had no problem in the mountains during a Tahoe ski trip.