radial tire in super gas?

[ausby]

my car normally works great. it just all of a sudden does this. I put tires on and im good for another 100 passes. I took some slow motion video of robs car and I think rocks are falling out of his car causing his issue. how many passes do people usually get out of a set of slicks doing this type of racing versus bracket racing? im sure leaving at 5000 is harder on tires than 3500