Abstract: A pneumatic tire includes a bead core, a bead filler located outside in a tire radial direction of the bead core, a carcass ply laid over between bead cores and bead fillers which are provided in a pair in the tire width direction respectively, a belt wound on an outside in the tire radial direction of the carcass ply, a tread portion located outside in the tire radial direction of the belt, and a sidewall portion located outside in the tire width direction of the carcass ply. A thickness dimension of the tire side portion is set to increase as proceeding from a tire maximum width position toward an outside in the tire radial direction.

Abstract: An intersection point between an interface between a cap rubber layer and a base rubber layer and an outermost belt lateral reference line extending from an outer end of an outermost belt is positioned on an inner side in a tire axial direction than an intersection point between a normal line extending from an outer end of a widest belt to the tread surface and the outermost belt lateral reference line. An outer end of the cap rubber layer is terminated on an inner side in a tire radial direction than an outer end of the base rubber layer, and the outer end of the base rubber layer is positioned on an outer side in the tire axial direction than an end of the tread surface.

Abstract: A pneumatic tire includes a tread portion, a side wall portion, a buttress portion provided between the tread portion and the side wall portion, a recessed groove provided in the buttress portion and extending along a tire circumferential direction and small hole lines provided in a tire width direction inner side of a contact ground end in the tread portion, in which the small hole lines have a plurality of small holes provided at intervals along the tire circumferential direction, and the small holes communicate with the recessed groove.

Abstract: A pneumatic tire includes: a tread; a sidewall; a buttress portion provided between the tread and the sidewall; a recessed groove provided along a tire circumferential direction in the buttress portion; and plural small holes provided at spaced intervals along the tire circumferential direction in a groove bottom of the recessed groove.

Abstract: A pneumatic tire includes a carcass ply that is wound up around a bead core from an inside to an outside in a tire axial direction; an inner metal reinforcing layer and an outer metal reinforcing layer that are wound up on an outside of the carcass ply from the inside to the outside in the tire axial direction; and a buffer layer that is provided between the inner metal reinforcing layer and the outer metal reinforcing layer, and is wound up from the inside to the outside in the tire axial direction. The buffer layer includes a rubber having a higher hardness than those of a carcass rubber configuring the carcass ply and a covering rubber configuring the inner metal reinforcing layer and the outer metal reinforcing layer.

Abstract: A pneumatic tire includes a shoulder land portion and a narrow groove in a tread surface. The narrow groove extends in the tire circumferential direction and sections the shoulder land portion into a main land portion and a sub land portion. A first groove portion extends from the tread surface toward an inner side in the tire radial direction in parallel to the tire equatorial plane. A second groove portion is provided closer to the inner side in the tire radial direction and the tire equatorial plane side than the first groove portion and extends in parallel to the tire equatorial plane. A coupling portion is connected to an end portion of the first groove portion in the inner side in the tire radial direction and an end portion of the second groove portion in the tread surface side.

Abstract: A method of manufacturing a pneumatic tire comprising a belt which is wound with a belt-under diameter D outside a carcass ply in a tire-radial direction, includes preparing a strip-like rubber-coated cord member where a plurality of belt cords which are arranged approximately parallel are coated with rubber and a width of the cord member in a lateral direction is ?D sin ?. The cord member is cut at the cord angle ? with respect to a longitudinal direction to cut out a belt forming member having a parallelogram which includes circumferential direction sides extending in a tire circumferential direction in a wound state and formed as cut portions and inclined sides extending parallel to the belt cord and defined as both side portions of the cord member. The belt forming member is wound into a circular cylindrical shape and joined the inclined sides which face each other to each other.

Abstract: An object of the present invention is to provide a pneumatic tire capable of, while restricting deformation of groove portions to prevent groove cracks, preventing chipping-off or break-off of protruding portions formed on wall surfaces of the groove as well as preventing irregular wear of the tire. In order to achieve the object, a pneumatic tire comprises a tread surface formed with a plurality of groove portions thereon, wherein at least one of the wall surfaces of the groove portion includes protruding portions and cut-off portions opened to the groove wall surface, and the protruding portions and the cut-off portions are formed alternately on the groove wall surface in an extending direction thereof.