Abstract: Provided is a pneumatic tire for motorcycles, which not only has satisfactory durability but also exhibits satisfactory grip performance when imparted with a large camber angle. This pneumatic tire has an aspect ratio of 80% to 40% and includes a spiral belt 7, which is formed by spirally winding a ribbon-like strip 9 obtained by rubber-coating two paralleled steel cords 8 in the tire circumferential direction and in which a spacing A between the two steel cords in the ribbon-like strip along the periphery of the spiral belt 7 is 0.8 to 1.5 mm in a state where the pneumatic tire is mounted on an application rim and inflated to a prescribed internal pressure with no load being applied thereto. The spiral belt is composed of a closely spaced region M in which a spacing B between steel cords of adjacent ribbon-like strips along the periphery of the spiral belt 7 is 0.8 to 2.5 mm and loosely spaced regions S in which the spacing B is 3.5 to 6.

Abstract: A tire vulcanizing mold for molding an unvulcanized tire into a pneumatic tire having a bead part with a bead heel part is provided with a side part ring for molding at least the bead part. A circumferential groove part extending in the tire circumferential direction is formed on a tire molding surface of the side part ring in a heel molding region for molding the bead heel part, the side part ring is divided into a side ring and a bead ring that abuts against the side ring, the division position of the tire molding surface of the side ring and the tire molding surface of the bead ring is located in the groove bottom of the circumferential groove part, and the cross-sectional shape of the circumferential groove part tapers toward the groove bottom.

Abstract: The pneumatic motorcycle tire includes a spiral belt, wherein: an aspect ratio of the tire is 60% or more; at a standard condition, each lap of reinforcing cords is located at a constant spacing along a periphery of the spiral belt among the entire tire width direction; in the tire widthwise cross section, a spacing A along the periphery of the spiral belt between each lap of the reinforcing cords adjacent in the tire width direction is 3.5 mm or more and 6.0 mm or less; a spacing B along the periphery of the spiral belt between the two reinforcing cords for forming the strip member is 0.8 mm or more and 1.5 mm or less; and a rupture strength of one of the reinforcing cords is 200 N or more and 1000 N or less.

Abstract: A tire vulcanizing mold for molding an unvulcanized tire into a pneumatic tire having a bead part with a bead heel part is provided with a side part ring for molding at least the bead part. A circumferential groove part extending in the tire circumferential direction is formed on a tire molding surface of the side part ring in a heel molding region for molding the bead heel part, the side part ring is divided into a side ring and a bead ring that abuts against the side ring, the division position of the tire molding surface of the side ring and the tire molding surface of the bead ring is located in the groove bottom of the circumferential groove part, and the cross-sectional shape of the circumferential groove part tapers toward the groove bottom.

Abstract: A motorcycle tire includes, on an outer circumferential side of a crown region of a radial carcass, a belt layer, a single auxiliary belt layer, and a tread rubber in the stated order, a periphery width of the auxiliary belt layer being greater than a periphery width of the belt layer. The cords of the auxiliary belt layer extend in a direction in which an inclination angle of the cords of the auxiliary belt layer with respect to a tire circumferential direction gradually decreases from each of both ends of a tire equatorial region including a tire equatorial plane toward a corresponding ¼ position which is at a distance of ¼ of the periphery width of the auxiliary belt layer from the tire equatorial plane along a periphery of the auxiliary belt layer, and the inclination angle in the ¼ position is 60° or more and 85° or less.

Abstract: A motorcycle tire includes, on an outer circumferential side of a crown region of a radial carcass, a belt layer, a single auxiliary belt layer, and a tread rubber in the stated order, a periphery width of the auxiliary belt layer being greater than a periphery width of the belt layer. The cords of the auxiliary belt layer extend in a direction in which an inclination angle of the cords of the auxiliary belt layer with respect to a tire circumferential direction gradually decreases from each of both ends of a tire equatorial region including a tire equatorial plane toward a corresponding ¼ position which is at a distance of ¼ of the periphery width of the auxiliary belt layer from the tire equatorial plane along a periphery of the auxiliary belt layer, and the inclination angle in the ¼ position is 60° or more and 85° or less.

Abstract: The present invention has an object of providing a pneumatic tire having a tread pattern capable of providing both excellent drivability and a high partial wear resistance.

Abstract: The present invention has an object of providing a pneumatic tire having a tread pattern capable of providing both excellent drivability and a high partial wear resistance.

Abstract: The present invention has an object of providing a pneumatic tire having a tread pattern capable of providing both excellent drivability and a high partial wear resistance.

Abstract: A two-wheeled motor vehicle pneumatic tire (10) includes: a carcass layer (14) straddling a pair of bead portions (12); an inclined belt layer (18) that is disposed at a tire radial direction outer side of a crown portion (14C) of the carcass layer (14), and that includes a plurality of cords (18A) that are inclined with respect to the tire circumferential direction; and a spiral belt layer (20) that is disposed at the tire radial direction outer side of the inclined belt layer (18), and that is formed by winding a rubber-covered cord (20A) in a spiral shape in the tire circumferential direction.

Abstract: The present invention has an object of providing a pneumatic tire having a tread pattern capable of providing both excellent drivability and a high partial wear resistance.

Abstract: A tire for two-wheeled motorcycles of the present invention includes a first carcass layer folded back along circumferential surfaces of bead cores, a second carcass layer folded back along circumferential surfaces of turnbacks of the first carcass layer 5, a belt layer wound spirally along a tire circumferential direction and an intermediate carcass layer provided between the first and second carcass layers 7 and in an inner circumferential side of the belt layer and extending close to a tire maximum width.

Abstract: A tire for two-wheeled motorcycles of the present invention includes a first carcass layer folded back along circumferential surfaces of bead cores, a second carcass layer folded back along circumferential surfaces of turnbacks of the first carcass layer 5, a belt layer wound spirally along a tire circumferential direction and an intermediate carcass layer provided between the first and second carcass layers 7 and in an inner circumferential side of the belt layer and extending close to a tire maximum width. According to the present invention, reduction of shear stiffness is restrained and thereby driveability and stability, especially handling response, can be improved.