I contacted Phils in Oct, no supply for 13"s. I didnt shake them down for info though. Looks like every other size is available, even the autox compound in 13s. I guess Im not in a hurry, from the wear Im seeing on the Hoosiers, Id assume Id get 6-8 weekends out of a set, which likely means thats 3 years for me. Figured Id see if anyone on here had the inside scoop. Ill hit up Phil if I get desperate.
Until then the r6s on the car have a couple of sessions left (been saying that for the last three events) and some takeoffs from Hardison.