What is the construction of NASCAR tires?

Answer 1

I would have to assume that your question is concerning the run-flats they use. The other tires are just a steel belted radial design, basically, with a prescribed compound, hardness of rubber, per track. There is a little more to it than that, but not much. The run flats are a tire, within a tire. The inside tire even has a pressure setting, which affects outer tire pressure. Most of the street versions of run-flats, rely on a super rigid sidewall. And there is very little rubber, in tires anymore. I don't know if this is a deep enough answer for you, but, if not email me, and I will explain further.