Abstract: A method for manufacturing a pneumatic tire includes: a step of winding carcass plies around a molding drum to mold a carcass, wherein the carcass has a joint portion in which ends of each of the carcass plies in a tire circumferential direction are overlapped with each other, the method further includes a step of pasting a rubber tape that covers at least a part of the joint portion after winding the carcass ply, and the rubber tape has: a central portion pasted to an outside of the joint portion and extending with a constant thickness along the tire circumferential direction; and tapered portions individually extending from both ends of the central portion in the tire circumferential direction along the tire circumferential direction while reducing a thickness of each of the tapered portions, and having tip ends with an angle of 45 degrees or less.

Abstract: A tire 1 according to an example of an embodiment includes a plurality of lands, and a tread having a sipe formed in at least part of the lands. An inclined surface is formed between an opening end on at least one side in a width direction of the sipe and a ground contact surface, the inclined surface having a linear shape in cross section and continuing from the ground contact surface. An intermediate surface is formed between the inclined surface and the sipe, the intermediate surface having an inclination angle with respect to the ground contact surface of 0 degrees or having an inclination angle with respect to the ground contact surface that is smaller than an inclination angle of the inclined surface with respect to the ground contact surface.

Abstract: A pneumatic tire of the present disclosure includes a tread, wherein the tread includes: a shoulder main groove; a plurality of shoulder slits; and a plurality of shoulder blocks defined by the shoulder main groove and the shoulder slits, the shoulder blocks include inclined portions inclined inward in the tire radial direction from the shoulder blocks toward an outside in the tire axial direction, the inclined portions include: first inclined portions; and second inclined portions having dents dented more inward in the tire axial direction than the first inclined portions, and the first inclined portions are adjacent to each other with one of the shoulder slits interposed between the first inclined portions and the second inclined portions are adjacent to each other with other shoulder slit interposed between the second inclined portions, the one shoulder slit and the other shoulder slit being paired and defining the shoulder blocks.

Abstract: In a non-pneumatic tire, an outer ring comprises a laminate having a plurality of fiber layers, and at least one elastomer layer interposed between an adjacent pair of a plurality of fiber layers, the plurality of fiber layers include an outermost layer which among the plurality of fibers is that which is arranged in outwardmost fashion in a tire radial direction, and an innermost layer which among the plurality of fibers is that which is arranged in inwardmost fashion in the tire radial direction, and at least one of the outermost layer and the innermost layer contains a first fiber array at which fibrous material is arrayed so as to extend in the long direction of a joint.

Abstract: An object of the invention is to provide a rubber composition having excellent durability while maintaining a low fuel cost, and a pneumatic tire using the rubber composition. A rubber composition contains silica in a diene rubber. A deformation amount of a rubber component in a sample obtained by vulcanizing the rubber composition when the sample is elongated by 200% is obtained by a force curve measurement with an atomic force microscope, and a ratio of a rubber component having a deformation amount smaller than a weighted average value thereof is 70 vol % or more in the rubber component.

Abstract: A rubber composition according to an embodiment contains a diene rubber and silica. A change rate of a distance between aggregates represented by V50/V0 calculated by an inertia radius V50 of a silica aggregate and an inertia radius V0 of the silica aggregate is 1.30 or more. The inertia radius V50 is obtained by performing a small-angle X-ray scattering measurement in a state where a vulcanized rubber obtained by vulcanizing the rubber composition is elongated by 50%, and the inertia radius V0 is obtained by performing a small-angle X-ray scattering measurement in a state where the vulcanized rubber is not elongated.

Abstract: A pneumatic tire includes a main groove, a first block line provided on one side in a width direction of the main groove, and a second block line provided on the other side in the width direction of the main groove. A first block included in the first block line has a first acute angle portion sectioned at an acute angle by the main groove and a first lateral groove, and a first reinforcing protrusion protruding from the first acute angle portion side of a side wall facing the main groove to the main groove. A second block included in the second block line has a second acute angle portion sectioned at an acute angle by the main groove and a second lateral groove, and a second reinforcing protrusion protruding from the second acute angle portion side of a side wall facing the main groove to the main groove.

Abstract: A rubber composition according to an embodiment contains a diene rubber and silica. A value Dm/Rg obtained by dividing a mass fractal dimension Dm of a silica aggregate by an inertia radius Rg of the silica aggregate is 0.20 nm?1 or more, the inertia radius Rg being obtained by irradiating a vulcanized rubber obtained by vulcanizing the rubber composition with X-rays to perform a small-angle X-ray scattering measurement, and the mass fractal dimension Dm being obtained by irradiating the vulcanized rubber with X-rays to perform an ultra-small angle X-ray scattering measurement.

Abstract: A rubber composition manufacturing method comprises an operation in which at least rubber, silica, and silane coupling agent are kneaded in an internal kneader at not less than a temperature lower limit for a coupling reaction between the silica and the silane coupling agent to proceed. For at least a portion of time during which that operation is being carried out, a compressed gas is delivered to the kneading chamber while the ram is in a nonpressing state.

Abstract: A rubber composition manufacturing method comprises: an operation in which at least amine antioxidant, zinc oxide, silane coupling agent, silica, and rubber comprising modified polymer are fed into an internal kneader; and an operation in which kneading is carried out at the internal kneader while kneading temperature is controlled so as to suppress occurrence of a coupling reaction between the silica and the silane coupling agent, and so as to suppress occurrence of a bonding reaction between the silica and the modified polymer.

Abstract: A pneumatic tire including a first block line in which a plurality of first blocks sectioned by main grooves and lateral grooves are arranged in a tire circumferential direction on a tread, the plurality of lateral grooves includes first lateral grooves extending inclined with respect to a tire width direction and second lateral grooves inclined in an opposite direction to the first lateral grooves with respect to the tire width direction, the first and second lateral grooves are alternately arranged, the first block includes a first sipe extending while being inclined to the tire width direction, a second sipe inclined in an opposite direction to the first sipe with respect to the tire width direction, and a first connecting portion connecting ends of the first sipe and the second sipe, and the first connecting portion is formed by a recessed portion shallower than the first sipe and the second sipe.