BILLLSBIRB, i have gone as fast as 8.4s without screws. just mark the tire and make a pass to see if they moved..if the rim is shiney at the bead take a diagrinder with the little sanding disc lightly scuff up the bead area. with like 800grit or scuff pads so the tire has something to bite on to. 1.2 60fts no screws and never spun a tire. hope this helps..