PRECURED TREAD AND RETREADED TIRE

摘要

There is provided a precure tread and a retreaded tire using same capable of enhancing the stiffness of the land portion and significantly reducing likelihood of peeling off from the base tire during traveling by optimizing the cross-section shape of the rear surface groove of the precure tread, while maintaining the wet performance from the beginning to the end of wear life. A precure tread 1 has a circumferential groove 2 extending in a circumferential direction of a tire on a front surface which is to be a ground contact surface of the tire and a rear surface groove 4 extending in the circumferential direction of the tire on a rear surface which is to be attached to a base tire 3, the rear surface groove appearing from a tread surface as wear of the tread surface is progressed. Such rear surface groove 4 has a generally trapezoidal shape, as viewed in a cross-section in the width direction of the tire, and a width of the rear surface groove is constant or tapered from a bottom 5 to an opening 6 of the groove. Such precure tread is used to form a retreaded tire.