10000 miles on them and four tries at getting rid of the incessant thump at 65 to 75 mph, My car has 265,000 miles. I have had 8 sets of four tires ALL BOUGHT THROUGH TIRE RACK!!! I have never and I mean NEVER had an issue with Tire rack, and still don't. I conceded, it may be the car so I changed the prop shafts ($600 they had 90,000 miles and some wear), no change in the Thump, Thump, Thump. Ok maybe the one U-joint or the carrier bearing, swapped them (I ALWAYS use OEM, no cheap parts as this is my track car as well and the thought of a cheap knock off part letting go in a corner at 100mph makes me ill). No change. Its the tires, no doubt in my mind.
I envy the folks that got smooth quiet ones, but it seems like a crap shoot that is not worth taking.