There`s no doubt some get away w/screws but in addition to guaranteeing the tire wont slip there`s an advantage(supposedly)to the screw spacing and controlling the "wadding up" of the tire.............

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....