I have no clue what the fuss is all about.

I would hope the rule was changed because of not only perceived wheel shortages, but also the tire manufacturers not venturing into 13 and 14 inch size expansion in DOT race rubber.

For example, is that new F1 style Kumho available in a 13 or 14 yet? will it ever be?

As for going "down size", I haven't ever seen a 12" or 10" DOT race tire on the Hoosier truck (or any other suppliers catalog).

Have you?

The bottom line is that the marketplace will resolve this, so why not let anyone run sizes whatever up or down they want in the "real" 13 to 15 range. They soon will probably not have much of a choice.