Good to note. I was leaning toward the Rivals for my next set but maybe I will take a second look at the ZIIs. The Hankooks are great for STX where you can have a lot of camber but I have to run mine at 45psi in the front to keep off the corners with only the 1* (ish) legal in stock form.

Just to add information, my ZIIs were worn almost to/at the wear bars (is that 3/32"?) at Nationals. I ran RTR and thought they lacked some grip, probably too far gone for this event/course. They also feel a little harder at this wear level, probably just because of the lack of rubber. They did not grip well at all on the west course (80's, cloudy and spitting rain). I lowered the air pressure to 34F/32R and the rear end seemed to stay in place much better, but still not confidence inspiring. They did seem to grip better on Friday, 93 and sunny on the east course. If I make it to Lincoln again I will have a fresher set of ZIIs. Looking at the overall results, I still think they are competitive in the street tire classes at Lincoln.

I'd definitely say they are letting go around that 3/32" then. I havent had any that low on ZIIs. I know my RS3s were decent down to 1/32, didn't really feel significant drop until 2-3/32 but they were still usable (that was local events mind you).

The Rivals seem to work pretty well everywhere except Lincoln... If you are normally running on asphalt they will work well.

I'm hoping the 235/40 R1R gets banned because it might be the tire to have on a C-Street BRZ but nobody wants to run a tire that only lasts 20 runs.

This. This. This.

In ST*, it's going to be legal, like the 195/50, I feel.
But in RT/Street, this needs to be banned, just like the 195/50/15 is.

Where do I send letters to the SEB? That part is new to me.

use this link to write to the various SCCA boards.

Your newsletter. I wish to subscribe to it.

I never heard that about the 235 Toyos. Good to know.

I am personally still sticking with the Rivals. I like the feel and I don't drive on concrete in my region.

Definitely. Not a lot of point in switching to street tires if you gotta have a new shaved set every 20 runs to stay competitive.

I wrote the SEB asking this be reviewed and hopefully banned. Quoting my letter below if anyone wants to see it for any points to make in their own. Please write them to see if this can be rectified before C-Street becomes ruined on it's first year out.