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.
Firestone tire is a NASCAR sponsor. Some of the cars use firestone tires other cars use NASCAR tires. Firestone also sells NASCAR tires in addition to their own brand.
They fill their tires with nitrogen.
For maximum grip.
NO
Yes the new tires are faster and do not slip.
About 1500 dollars a set.
1995
The biggest tires that are common have about an 29" outer diameter.
Probably sell them as souvenirs.
It is just a form of celebration.
Unlike the Nascar Nationwide Series, the Sprint Cup Series does not use rain tires.
No, they can not. Nascar does not use rain tires. Just like any other Nascar race, they would have to wait for the rain to stop and then begin the track drying procedure.