Abstract: An improved tire tread has tread elements which form a tread pattern exhibiting two or more peripheral grooves and a plurality of transverse grooves extending inward from the outer (ground engaging) surface of the tread. Preferably the transverse grooves extend across the peripheral groves, and there are at least four of the peripheral grooves. Along at least a major portion of one upper side of chosen ones of such grooves, the tread elements defining such groove side are formed with serrations extending inward of the groove from the tread surface at an acute angle to a radius of the tire and terminating short of the base of the groove. The serrated surfaces define an upper portion of the groove as an opening of increased area at the upper part of the groove intersecting the tread surface, and present a substantially increased traction area along the outer or open top of the groove.

Abstract: An improved tire tread has tread elements which form a tread pattern exhibiting two or more peripheral grooves and a plurality of transverse grooves extending inward from the outer (ground engaging) surface of the tread. Preferably the transverse grooves extend across the peripheral groves, and there are at least four of the peripheral grooves. Along at least a major portion of one upper side of chosen ones of such grooves, the tread elements defining such groove side are formed with serrations extending inward of the groove from the tread surface at an acute angle to a radius of the tire and terminating short of the base of the groove. The serrated surfaces define an upper portion of the groove as an opening of increased area at the upper part of the groove intersecting the tread surface, and present a substantially increased traction area along the outer or open top of the groove.