but the tradeoff of tread life and ability to retain grip after repeated heat cycles would lead me to recommend the Toyos. If you weren't driving to the events and changing tires at the track then I would probably recommend the Kuhmo's or one of the other stickier tires. The Nitto nt01's are supposed to be very similar in compound to the ra-1's, but if you're driving to and from the events the RA-1's would be better suited just in case you get caught in the rain.