We run shaved RA-1's, 275/40/17s on the shop car.. I can't remember off the top of my head what exact tread depth we start out with. In any case, within 3 or 4 sessions most of the recognizable tread is gone and it's practically a slick. I have no direct experience with unshaved ones yet, but I would assume they could last a bit longer if you're looking for longevity. If you're looking to win in competition, then definitely shave them down. With full tread the tires will be squirming around and won't feel as crisp.
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