17.5bl
10.5 / 19t
open mod BR or BL
If you don't want to run slower for stock, then you should probably already be running a 10.5 or 19T. Slow the stock cars down as has been said numerous times already.
Again, Dawn has also stated numerous times that they're encouraging clubs to tweak the rules as needed. If you guys with the 13.5's are so numberous at your local clubs, why wouldn't you simply create a class for it? I'm sure the host club would have no problem taking your entry fees. The other benefit that I see to slowing down the stock class especially at national events is it would finally force some of these well known big name stock drivers out of it. This is long overdue.
ROAR can simply be used as "guideline" on the local scene.....we're doing it here on the state level races. This year looks to be the most exciting yet!