Abstract: Rolling resistance performance, high-speed-durability performance, and cornering performance are simultaneously realized at high levels. A two-wheeled automotive vehicle tire 1 includes a tread portion having an outer surface that extends so as to be curved such that the outer surface is convex outward in the tire radial direction, and is arc-shaped. A tread rubber 2G includes a center rubber CR, shoulder rubbers SH, and middle rubbers MD. The center rubber CR includes a center cap layer CRc and a center base layer CRb. A loss tangent tan ?1b of the center base layer CRb and a width L1b thereof in the tire axial direction are each limited so as to be set within a predetermined range.

Abstract: It is an object to provide a tire for a motorcycle which does not damage a stability in a transition between straight running and cornering but is excellent in various performances. A tire (2) includes a tread (4). The tread (4) is divided into (2N?1) parts (N is a natural number which is equal to or greater than four). The tread (4) is divided into a first region (20) positioned on a center region and a second region (22) to an Nth region in order from the center region toward a shoulder region. The second region (22) to the Nth region make a pair of regions which are symmetrical with respect to an equator plane of the tire. The first region (20) to the Nth region are formed by crosslinked rubber compositions respectively and materials of the respective regions are different from each other. In the first region (20) to the Nth region, a rubber hardness of the region on the adjacent center side is equal to or higher than a rubber hardness of the region on the shoulder side.

Abstract: It is an object to provide a tire for a motorcycle which does not damage a stability in a transition between straight running and cornering but is excellent in various performances. A tire (2) includes a tread (4). The tread (4) is divided into (2N?1) parts (N is a natural number which is equal to or greater than four). The tread (4) is divided into a first region (20) positioned on a center region and a second region (22) to an Nth region in order from the center region toward a shoulder region. The second region (22) to the Nth region make a pair of regions which are symmetrical with respect to an equator plane of the tire. The first region (20) to the Nth region are formed by crosslinked rubber compositions respectively and materials of the respective regions are different from each other. In the first region (20) to the Nth region, a rubber hardness of the region on the adjacent center side is equal to or higher than a rubber hardness of the region on the shoulder side.

Abstract: A tire 2 comprises a tread 4, a sidewall 6, a bead 8, and a carcass 10. The bead 8 includes a core 20 and an apex 22 which extends outward in a radial direction from the core 20. The apex 22 has an outer layer 24 and an inner layer 26 which is located to the inside of the outer layer 24 in the axial direction. A hardness of the outer layer 24 is greater than that of the inner layer 26. A difference of the hardness between the outer layer 24 and the inner layer 26 is 15 or greater and 30 or less. A ratio of a thickness of the inner layer 26 to that of the apex 22 is 40% or greater and 60% or less. A ratio of a height HA in the radial direction of the apex 22 to a height HS in the radial direction from a bead base line to an end of the tread 4 is 40% or greater and 60% or less.

Abstract: A tire 2 comprises a tread 4, a sidewall 6, a bead 8, and a carcass 10. The bead 8 includes a core 20 and an apex 22 which extends outward in a radial direction from the core 20. The apex 22 has an outer layer 24 and an inner layer 26 which is located to the inside of the outer layer 24 in the axial direction. A hardness of the outer layer 24 is greater than that of the inner layer 26. A difference of the hardness between the outer layer 24 and the inner layer 26 is 15 or greater and 30 or less. A ratio of a thickness of the inner layer 26 to that of the apex 22 is 40% or greater and 60% or less. A ratio of a height HA in the radial direction of the apex 22 to a height HS in the radial direction from a bead base line to an end of the tread 4 is 40% or greater and 60% or less.

Abstract: A radial tire for motorcycles comprises a carcass extending between bead portions through a tread portion and sidewall portions, and a belt disposed radially outside the carcass in the tread portion and comprising two cross breaker plies of cords laid at angles of from 16 to 26 degrees with respect to the tire equator. And the method of making the radial tire comprises vulcanizing the tire in a mold which causes a variable stretch to the belt during vulcanizing the tire, wherein the stretch at the tire equator is in a range of from 6.0 to 7.0%, and the stretch gradually decreases from the tire equator to the axial edges of the belt. The stretch is defined as (BD2/BD1−1)×100 wherein BD1 is the inside diameter of the belt before tire vulcanization, and BD2 is the inside diameter of the belt during tire vulcanization.