A tire sidewall comprising a vulcanized rubber and a high molecular weight wax.

A pneumatic tire manufacturing method is provided in which raw cover molding is suitably performed with no, or a minimal amount of, down-stitching in the manufacture of SOT-structure pneumatic tires; also provided is a pneumatic tire. This pneumatic tire manufacturing method involves: a step in which a sidewall, an inner liner, and a ply are bonded on a first molding drum, a pair of beads is set, and the tread side part is formed on the side wall, forming a first cover; a step in which a breaker and band are bonded on a second molding drum and the tread center part is formed on the band, shaping the tread ring; a step in which the first cover is inserted inside of the tread ring and the first cover is inflated, bonding the tread ring and the first cover with pressure; and a step in which the sidewall is folded back towards the lateral surface of the inflated first cover and bonded to the lateral surface of the first cover, and the tread side part and the tread center part are bonded together.

A pneumatic tire includes: sidewall portions positioned on both sides in a tire lateral direction; bead portions positioned toward the inside of the respective sidewall portions in a tire radial direction; a plurality of protectors extending in a tire circumferential direction and projecting from a surface of the sidewall portion in the sidewall portion of at least one of the sidewall portions, provided within a range of from 30% to 70% of a tire cross-sectional height from an inner end of the bead portions in the tire radial direction toward an outer side in the tire radial direction; and a plurality of helical reinforcing members each formed in a helical shape and disposed inside the plurality of protectors, the helical reinforcing members each having a central axis of the helical shape, the central axis extending in the tire circumferential direction.

A pneumatic tire includes a tread portion, a pair of sidewall portions, and a pair of bead portions. A carcass layer is mounted between the bead portions, and the carcass layer is turned up from a tire inner side to a tire outer side about a bead core of each of the pair of bead portions. A tread radius in a meridian cross-section of the tread portion is in a range of from 600 mm to 1700 mm, a ground contact width of the tread portion is in a range of from 60% to 90% of a tire cross-sectional width, and a height of a bead filler is equal to or less than 30% of a tire cross-sectional height.

A pneumatic tire has a rim strip rubber. A radial height of the rim strip rubber on the basis of an outer diameter position of a bead core is equal to or more than 70% of a radial height of a tire outer diameter position. An upper end of a side reinforcing layer is arranged closer to an outer side radially than an upper end of a bead filler. A distance from a tire maximum width position to the upper end of the side reinforcing layer is equal to or less than 5 mm. The maximum thickness Tw of the rim strip rubber between the upper end of the bead filler and the upper end of the side reinforcing layer is greater than the maximum thickness Tm of the rim strip rubber closer to the outer side radially than the upper end of the side reinforcing layer.

A tire sidewall comprising a vulcanized rubber and a high molecular weight wax.

A pneumatic tire includes: sidewall portions positioned on both sides in a tire lateral direction; bead portions positioned toward the inside of the respective sidewall portions in a tire radial direction; a plurality of protectors extending in a tire circumferential direction and projecting from a surface of the sidewall portion in the sidewall portion of at least one of the sidewall portions, provided within a range of from 30% to 70% of a tire cross-sectional height from an inner end of the bead portions in the tire radial direction toward an outer side in the tire radial direction; and a plurality of helical reinforcing members each formed in a helical shape and disposed inside the plurality of protectors, the helical reinforcing members each having a central axis of the helical shape, the central axis extending in the tire circumferential direction.

A pneumatic tire including a tread portion, a pair of sidewall portions, a pair of bead cores, a first ply, and a second ply being discontinuous and having a pair of ply pieces. The first ply includes a central portion positioned in the tread portion, a pair of side portions extending from opposite ends of the central portion, and a pair of folded-up portions folded up around the respective pair of bead cores. The pair of ply pieces each includes a side portion extending from an inner end, and a folded-up portion folded up around any one of the pair of bead cores. In each of the sidewall portions, the first ply has a plurality of first cords extending in the tire radial direction, and the pair of ply pieces each has a plurality of second cords extending at an angle from the first cords.

A pneumatic tire includes bead cores, a carcass ply and a belt. The carcass ply includes: a first ply having a central portion positioned inward of the belt in the tire radial direction, a pair of side portions extending inward from opposite ends of the central portion in the tire radial direction, and folded-up portions extending from the respective side portions, being folded up around the respective bead cores; and a second ply being discontinuous and disposed outward of the first ply in the tire radial direction, having a pair of ply pieces provided with inner ends positioned on respective sides of the central portion of the first ply, side portions extending inward from the respective inner ends in the tire radial direction, and folded-up portions extending from the respective side portions, being folded up around the respective bead cores. The first ply has a ply-overlapping portion.

The present technology provides a pneumatic tire that can improve air dispersibility during vulcanizing at the interfaces of a plurality of types of rubber layers integrally formed by rolling or extruding, and that can effectively suppress blister defects. In a pneumatic tire where a plurality of types of rubber layers integrally formed by rolling or extruding, at least one strand of thread is provided at an interface of the plurality of types of rubber.