Here are the nodes. The basic rubber material is in green. I’ve also started playing with creating a dust component, which is circled in red.
Here’s what that dust looks like. Still needs more randomness.
Referring back to the basic rubber material, does anybody know how to create the look of oil on the tire? I mean the colorful reflections, similar to how an oily puddle has many colors in it? I’ll post a reference image if I can find one.