Yep, most of them run one tire spinning 15.8's and that's in the the winter. Last one I seen the other night was in the 16's. I'll be at firebird on the 16th for a points race. I'm running slow with this heat. My fastest at the last race was a 13.20 @105mph. I'm putting my stock tires back on, because with those times I don't need to waste my DR's. Good luck at SIR.