They’re a great road racing tire, and I know their sidewalls are stiff.
IIRC don’t Nitto radials suck? lol Where did you quote that from? Can’t find anything on Toyo’s site.
If they work for some people, great. I just don’t recommend running such a wide tire w/ a stiff sidewall on such a narrow wheel.
Also to note, Toyo doesn’t make those tires in a 335 anymore, widest is 275.
For Toyo’s R888 tire (very similar to RA1), the minimum width wheel for a 335 should be 11", and even then you’re not using the tire to it’s potential with that size wheel.