I only had 2 sets because I was not sure if I was going to run them since they were 1st time using them on my X3.Track had hi bite & after the 1st qual the tires looked good enough for a 2nd run into the 3rd rnd.So they had about 30 mins on run time on them B-4 they were showing some wear.I used our OFNA inserts 29152.I wish I had the blue for the mains because the track grooved up even more & the slvrs were really getting into the track for some 2 wheel action. Awsome tire