First off, don't advertise your tires in this guy's thread?:wallbang:Good luck. I haven't had any luck selling 4 brand new one's for $600
Yes, that is OPR (other people's rubber). The amount of OPR depends on the the course used. These were used on the track (which they are great for).what is the surface covered in? is that melted rubber? I've been autocrossing in mine and I don't have the build up on the surface. Granted Autox doesn't generate near the same temps as track use. Is that was tracked A6s normally look like?