well for one, i suggest you press F10 and change the production renderer to scanline (Default)[its at the very bottom of common tab] so you can see the materials you are working with (and then go back to brazil for the rendering if you want)
unfortunately i believe he uses brazil presets so you cant do anything with those in scanline, so basically with his whole scene thing.. when it comes to messing with materials, your screwed, because you cant see any materials (not even the materials it supports.. kinda ironic isnt it?)
what i suggest is just reset the scene, and make a scene similar to that of a car, with a ground plain, and an overlight plain, and just mess around with the materials until you get what you want (on a sphere or something you can apply this to to get the round effect of a wheel) and save the material library (MTL editor in material choice list) and save it, then drag and paste into the wheel material