Step 4. - Before you even begin to make this tire, you should make the two textures needed to apply to the tire. I would suggest something like the following two, since I already used them and they work very nice for the wanted effect: double texture on this tire. Save these two pictures as tire-side.JPG and tire-track.JPG.
Different map channels can have different U and V tiling values, different U and V offsets, and so on. In the UVW Map modifier, you can also set different map channels to have different mapping types (planar, cylindrical, spherical, and so on).