Here's your rule. Replace the whole goldarn section with:

Cars originally equipped with twelve (12) inch wheels may fit thirteen (13), fourteen (14), or fifteen (15) inch wheels. Cars originally equipped with thirteen (13) inch or metric 365 wheels wheels may fit fourteen (14) or fifteen (15) inch diameter wheels. Cars originally equipped with fourteen (14) inch or metric 390 wheels may fit fifteen (15) inch diameter wheels. All other cars shall retain the wheel diameter fitted as original equipment for their make, model, and type.

Knockoff/quickchange type wheels are prohibited. Wheels must be made of metal.

If you felt motivated, you could also get them to put in a little table to make it more clear.


Although, I still wonder why it's such a big deal...