Quote Originally Posted by JeffYoung View Post
Bill, thanks -- but I think that was my point.

Only an ITR car can run larger than the mandated diameter size wheels if they came stock. For S/A/B, that's 15, and R 17. An R car that came with 18" diameter wheels can run them, but an S car that came Iwith 17" wheels cannot.

There used to be a prohibition on running smaller than stock but I don't think that is there anymore. I'll look -- I think I drafted the first take on it a while back.
As I said in my prior post, the ITA Z3 with the four cylinder motor only came with 16x7 rims. It's probably one of the few in ITA with this allowance.