I know this is a NEVER ENDING subject, but I'm getting new tires next week. FYI, most of my miles area from cruises, road trips, and I do about 2-5 AutoX/road course events per year. I planed on getting Nitto 555 245/45/17 on all corners, but don't know if they'll be sticky enough. I'd like to get Nitto 555RII (road course drag radial) but they don't make them in the size I need. I thought about just putting Nitto 555R (drag radial) on the rear, but that doesn't work for open track duties. I could get the Nitto 555R on all corners, but I'm worried that I'll only get 7K miles out of them. Can these last over 15K miles if I don't abuse them, and rotate them regularly? Any other recommendations? Thanks,