After further tests I think I have it. You need to blur the image map. Chipp how much blur do you use. This test uses a gaussian blur of 1. Do you use gaussian blur? and what other means do you use to get the smoothness? I still can't figure out how you are getting the front of the tire looking like that. See how the displacement has messed the front of the tire up in my imege. Do I need to add a torus around the outside of the tire to cover the displacement on the front? Also just looking at the background for your model. Did you use HDRI for the lighting/background? Thanks