Look,
Toyo and NASA have jerked us around on this. That is clear. Toyo said the R888 was "improved". Well they failed on that one. At best you could say it is a wash. Believe me I have worked on these R888 and don't hate them as much some others. Still lap vs lap time they are a wash and they don't last. So R888 = fail.
NASA made the mistake of listening to Toyo. Well I can't really fault them for that. RA-1 is great tire and Toyo said the R888 better. So NASA does a little test and nothing bad comes up. Then they go for it. As it turns out there are problems and NASA try to react to them. Certainly not perfect, but they did try. So in the end they pushed and we are back on the RA-1.
Now what other tire can we run? Earlier this year I was taking to people about "other tires". Bottomline is there is not much out there. The only candidate is the Nitto which being owned by Toyo makes for a strange relationship. Taking all the crappy poltics out of it the RA-1 is STILL THE BEST TIRE FOR 944 SPEC.
This does assume that the "new" RA-1 is the same as the old RA-1 and we don't get jacked in price.
One really had thing is that the last 12-18 months have been about tire development. Now I believe that you need to develop your tire for you car, but constantly changing tires is bad for a class like ours. It is one thing to tune the chassis to the tire, but another to always be changing the tire FORCING set-up changes.
My feeling is we go with the 225/50 R15. It is a tire we have a long established history on. The tire has no real vices and we know how long they last. We know how they respond to shaving. We know how they respond to driving style and we know what is a good basic set-up to get good lap times and good life. Frankly the RA-1 is key to building the class in the first place.
A 205 vs 225 is another change. Sure spec E30 guys run them, but they are running similar lap times, but with 20+ more hp. Spec Miata guys run as fast, but with alot less weight. So lets keep the 225/50 R15. I still am concerned about a large price gap to the 205, but if it remains reasonable as Steve pointed out the change will be more hassle than the benefit.
Lets also remember that we had 34 cars at Nationals. The second largest class. This means we are force. Toyo will notice us consiering we got the big payout. If we were a 10 car class maybe our size would be more easily overlooked, but I believe we are large enough for them to take notice.
Again before we run away from Toyo lets consider on paper what other tires we would run to? Lets not just "f-up Toyo" and by doing, put us on an inferior tire. The R888 may not be ideal for the class, but I have yet to find a tire better than the RA-1.