Did a track day yesterday and when I got home I noticed that the inside 2" of tread on my left front tire was chunked up all the way around. I mean huge chunks were torn out! This has never happened before. The only difference was that I was using a different brand that normal but I had already done 3 days on these tires and all was ok but this 4th day it all went to hell. Everything in my steering and suspension seems to be ok and I have not changed my alignment. Any thoughts. Oh the tire was a Cooper RS3-S. I usually use a Nitto NT-05 but the track has gotten so worn out that I was tired of buying tires every 3 days. Track is fixed now so that's not what tore up the tire.Alignment is 4.5 caster, 2.5 camber and zero toe.