Robert what track will you be racing on? I'm sure you know that everybody is running primewells. I cant remember what we ran in the heat races but in the feature we would usually run a Goodyear aquatread when it got slick. That seamed to work pretty good. later I believe we switched to a Michelin that worked even better but don't remember for sure what it was. concentrate on the feature race. It pays the bills and supplies the points