Abstract: A method for manufacturing pneumatic tire of the present disclosure, the method comprising: a first step of pressure-bonding a bead filler to an outer peripheral portion of an annular bead core, the bead filler being thinned outward of the bead core in a radial direction, and fabricating an annular bead member; a second step of causing a separator to support the bead filler, and mounting the bead member so that the radial direction of the bead core goes along a horizontal direction; and a third step of cooling the bead member.

Abstract: A pneumatic tire includes a tread rubber region 5 a belt region 6 including a belt 61 and a contact patch pressure reducing rubber region 7, wherein tread rubber region 5 includes base rubber layer 51 and cap rubber layer 52. The two ends of the tread surface at shoulder lug 55 have first end 551 and a second end (not shown) which is located toward an interior in a tire width direction from first end 551. A contact patch pressure reducing rubber region 7 is disposed at a location between belt 61 and base nibber layer 51. The modulus of contact patch pressure reducing rubber region 7 is lower than the modulus of base rubber layer 51 and is lower than the modulus of cap rubber layer 52.

Abstract: A pneumatic tire has a narrow groove extending in a tire circumferential direction. The narrow groove is formed in a shoulder land portion of a tread. An inside concave curved surface and an outside concave curved surface are formed in a groove bottom portion of the narrow groove. The inside concave curved surface is formed by depressing a groove wall in a tread center side. The outside concave curved surface is formed by depressing a groove wall in a tread end side. An inner surface of the groove bottom portion including the inside concave curved surface and the outside concave curved surface is formed by a single circular arc in a tire meridian cross section. A radius of curvature of the circular arc is equal to or larger than a width of an opening portion of the narrow groove.

Abstract: A pneumatic tire has a narrow groove extending in a tire circumferential direction. The narrow groove being formed in a shoulder land portion of a tread. An inside concave curved surface and an outside concave curved surface are formed in a groove bottom port ion of the narrow groove. The inside concave curved surface is obtained by depressing a groove wall in a tread center side. The outside concave curved surface is obtained by depressing a groove wall in a tread end side. The groove bottom, portion of the narrow groove is provided as a shape which is wider than an opening portion of the narrow groove and is rounded. A height of the inside concave curved surf ace measured along a depth direction of the narrow groove is greater than a height of the outside concave curved surface.

Abstract: A belt layer of a pneumatic tire includes a first main working belt, a second main working belt arranged at an outer side of the first main working belt in a tire-radial direction having a cord angle ?p2 different from a cord angle ?p1 of the first main working belt in a direction with respect to a tire-circumferential direction, and a reinforcement belt. An absolute value of a cord angle ?r of the reinforcement belt is not smaller than 6 degrees and not larger than 9 degrees. The cord angles ?p1, ?p2, and ?r satisfy “?8??p1+?p2+?r?8”.

Abstract: A belt layer of a pneumatic tire includes a first main working belt, a second main wording belt having a cord angle different from a cord angle of the first main working belt in a direction with respect to a tire-circumferential direction, reinforcement belt. A cord angle of the reinforcement belt and a representative main groove angle have different directions with respect to the tire-circumferential direction, the representative main groove angle being defined as an angle formed by an element of the main groove with the longest length in the tire-circumferential direction and the tire-circumferential direction.