Abstract: An object of the present invention is to provide a pneumatic tire, in which a light is prevented from occurring on a wear indicator itself, edge portions and surfaces of a land portion located in the vicinity of the wear indicator, as well as a tire vulcanizing die therefor. In order to achieve the object, the main groove of the pneumatic tire includes on a groove bottom a wear indicator protruding by a predetermined height and in wall portions of the main groove located at both sides of the wear indicator as viewed in a width direction of the groove, at least one of the wall portions of the main groove is formed with at least one concave portion opening to a tread surface.

Abstract: Sipe groups including a plurality of sipes which is opened to a main groove and is arranged at intervals in a tire circumferential direction are formed in both land parts with the main groove being interposed therebetween. The sipe groups are arranged at intervals in the tire circumferential direction, and are shifted in the tire circumferential direction on both sides of the main groove.

Abstract: A tire forming mold has a side mold portion and an annular mold portion fitted to an outer side in a tire diametrical direction of the side mold portion at a time of clamping the mold, wherein the annular mold portion is constructed by a combination of sectors which are divided in a tire circumferential direction, and each of the sectors is capable of displacing in the tire diametrical direction, wherein a fitting diameter of the annular mold portion is set to be equal to or more than a fitting diameter of the pair of side mold portions, an annular rubber introduction groove extending along the tire circumferential direction is provided at least in one of a fitting surface of the annular mold portion and a fitting surface of the pair of side mold portions, and a shallow groove portion is formed in an introduction port of the rubber introduction groove.

Abstract: An object of the present invention is to provide a pneumatic tire, in which a light is prevented from occurring on a wear indicator itself, edge portions and surfaces of a land portion located in the vicinity of the wear indicator, as well as a tire vulcanizing die therefor. In order to achieve the object, the main groove of the pneumatic tire includes on a groove bottom a wear indicator protruding by a predetermined height and in wall portions of the main groove located at both sides of the wear indicator as viewed in a width direction of the groove, at least one of the wall portions of the main groove is formed with at least one concave portion opening to a tread surface.

Abstract: In a tire curing forming mold in which an annular mold portion brought into contact with a tread portion of a tire is constructed by sectors divided in a tire circumferential direction, an end portion of the sector is constructed by a piece attachable to and detachable from a sector main body, and the piece is structured to include all ridge lines between an end surface of the sector and a tread forming surface provided on an inner peripheral side of the annular mold portion.

Abstract: A tire forming mold has a side mold portion and an annular mold portion fitted to an outer side in a tire diametrical direction of the side mold portion at a time of clamping the mold, wherein the annular mold portion is constructed by a combination of sectors which are divided in a tire circumferential direction, and each of the sectors is capable of displacing in the tire diametrical direction, wherein a fitting diameter of the annular mold portion is set to be equal to or more than a fitting diameter of the pair of side mold portions, an annular rubber introduction groove extending along the tire circumferential direction is provided at least in one of a fitting surface of the annular mold portion and a fitting surface of the pair of side mold portions, and a shallow groove portion is formed in an introduction port of the rubber introduction groove.

Abstract: In a tire curing forming mold in which an annular mold portion brought into contact with a tread portion of a tire is constructed by sectors divided in a tire circumferential direction, an end portion of the sector is constructed by a piece attachable to and detachable from a sector main body, and the piece is structured to include all ridge lines between an end surface of the sector and a tread forming surface provided on an inner peripheral side of the annular mold portion.