I just swapped over to my street tires, and was shocked to find one of my RA1's corded. See my sig for basic car setup, springs are 450 front/500 rear, car has slight understeer characteristics, but balances nicely with the throttle.

Tires have 6 or 7 HPDE days only (including two run in the wet), all on the same track. They were shaved 2/32's (I think the Toyo's start at 8/32's, so when I started running them they had 6/32" grooves). Alignment is front camber -3.55, toe -0.03, rear camber -2.19, toe 0.0. Corner balanced. Tires never rotated.

So they don't photograph so well, but the left front has a severely scalloped outer edge, and the two outer grooves are gone, but the two inner grooves are still there (It looks like two different tire diameter halves molded together in the center). Left rear is slightly scallped and but CORDED on the outside, same story with the grooves.

Both right tires are in much better shape, but are worn slightly more on the inside that the outside (no scalloping, no cording)!

I'm trying to make sense of this. It is a given that I should have watched this more closely and rotated sooner, but given what I had read about the life of RA1's, I assumed I had much more time.

What I think all of this means is as follows:
- The track I run is much harder on the left handed tires
- I either don't have enough camber or am loosing camber due to suspension compression when turning right

What I don't know is:
- How do I fix this
- Do I do something to equalize the wear between the right and left sided tires (staggered spring rate R/L, staggered suspension), or do I just rotate very frequently. This car needs to function as my daily driver.

I'd appreciate any thoughts or input. Thanks.

Did you start them at 2/32nd's or 6/32nd's?

When I first ran them they were at 5/32's. (I found my notes--when I measured the grooves the grooves were between 4 and 5/32's.)

I had a similar problem with my cups last year at wakins,mostly right hand turns so it was basicly the left side tires with front being a little worse.it turned out later after doing some tire temp testing, that I was running them about 5-6 pounds underinflated 28-29 cold,thats the temp I was given to run them at from some of the Porsche guys, when I did the testing I found the optimum pressue for my car to be about 34.5-35 cold, after that the problem went away :o) my temps hot are about 40-41 which is about right.
if you dont already have a probe type temp gauge it is a great tool, take 3 temps on each tire right after 20 mins of track,about an inch from the sides and center, you can find data sheets for it on the internet, good luck.

I had the same experience on my 99 M Coupe. I have -1.50 camber and the H&R/Bilstein sport suspension. Road Atlanta is hard on the left front tire, so it was important to remount the front tires on the opposite wheels near the beginning, and then just swapped the left and right wheels when the tread was fairly well worn don and directionality was no longer an issue.

The odd cupping you discribe sounds like under inflation to me. I agree, RA1 seem to be better when run on the low side of pressure but that odd wear was my result. Bringing up my pressure resulted in much better wear but I loose performance after 4 or 5 hard 10/10 time trial laps. Recent emails about loss of performance in later laps with a Toyo rep confirmed I am too high in pressure. Problem is going lower is causing the cupping. I'm sure there is a magic number but I am a HPDE/TT guy that also instructs. Dicking with a pyrometer and pressure gauge every session is not really in the cards. So I just get my time in the first 3 laps and slip around the track the rest of the time. As long as I don't slide off the track and DQ my session time, it's good enough for me. Now If I was w2w, I guess I'd have to be out there with a pyrometer, pressure gauge, sun dial and witches brew. Sorry long winded answer to, your too low on air.