I sure miss the 15" - 17" wheels where the tire added a lot to suspension characteristics. I have 18" wheels on my new Ram 2500 diesel, CC, 4WD- the smallest aluminum wheel diameter available, and told all dealers I would not accept wheels any larger. As far as I am concerned, low profile tires and large diameter wheels are only appropriate on performance vehicles on the track with modified suspensions, where they can truly take advantage of the shorter, stiffer sidewall. Street vehicles typically can't as long as they are obeying traffic regulations and provide a harsher ride. I don't get it. Especially on a heavy duty truck.