Abstract: A method for manufacturing a pneumatic tire includes: using a first cover material and a second cover material in a belt cover material and spirally winding the first cover material from a second side to a shoulder region on a first side; spirally winding the second cover material from the first side to a shoulder region on the second side; spirally winding the first cover material from the shoulder region on the first side to a tire equatorial plane; and spirally winding the second cover material from the shoulder region on the second side to the tire equatorial plane, the first cover material and the second cover material being layered in a region between a portion of the first cover material that is located on the second side and a portion of the second cover material that is located on the first side, thereby forming an overlapping portion.

Abstract: A run-flat tire includes a reinforcing rubber layer with a roughly crescent-shaped meridian cross-section disposed in sidewall portions at both sides in a tire width direction. The tread portion is provided formed of a tread rubber that includes a cap tread rubber and an undertread rubber disposed on an inner side of the cap tread rubber in a tire radial direction and having a higher hardness than the cap tread rubber. In a meridian cross-section, a gauge of the undertread rubber on a shoulder land portion on an outer side of an outermost main groove located furthest outward in the tire width direction is thicker than a gauge of the undertread rubber of a center land portion closest to a tire equatorial plane.

Abstract: In a tire tread pattern, inclined grooves extend from a starting end in a center region including an equator toward both sides in a width direction and toward the same side in a circumferential direction to a pattern end. A periphery distance from the equator to the pattern end at an outer side in the width direction being 100%, in ranges separated from the starting end by ?35%, from >35% to ?50%, from >50% to ?70% and from >70% to ?100%, an inclination angle of the inclined grooves relative to the circumferential direction is from >40° to ?50°, from >50° to ?65°, from >65° to ?80°, and from >80° to ?90°, respectively. A circumferential-direction distance from the starting end to a terminating end of the inclined grooves is 60% to 90% of a width-direction distance.

Abstract: A tire includes shoulder main grooves, circumferential narrow grooves disposed between the shoulder main grooves and each having a groove width of 0.5 mm to 3.0 mm, and five or more rows of land portions defined by the shoulder main grooves and the circumferential narrow grooves. A first land portion includes S-shaped sipes that extend through the first land portion in a width direction. A second land portion includes S-shaped sipes that extend through the second land portion in the width direction, and the second land portion is a rib including a continuous road contact surface in a tire circumferential direction when the tire comes into contact with the ground. Connection portions of the S-shaped sipes of the first and second land portions with respect to the circumferential narrow grooves are at identical positions in the tire circumferential direction.

Abstract: A pneumatic tire is provided. An average thickness of an undertread rubber in a center region is greater than that in a shoulder regions, a loss tangent tan ? at 60° C. of the cap tread rubber is higher than that of the undertread rubber, and the ratio CAI/UAI of a cross-sectional area CAI of the cap tread rubber to a cross-sectional area UAI of the undertread rubber is not less than 0.15 and not greater than 0.95 in the center region.

Abstract: Provided is a pneumatic tire. A band-like sound absorptive member is fixed to the inner surface of a tread portion along the tire circumferential direction. An end portion in the tire width direction of the sound absorptive member is located on the outer side in the tire width direction with respect to a shoulder main groove located on the outermost side in the tire width direction. A width W1 of the sound absorptive member in the tire width direction and a tread development width TDW of the tread portion satisfy a relationship of 0.65?(W1/TDW)?0.90. The width W1 of the sound absorptive member and a belt width W2 of a first belt ply having the maximum width of a belt layer satisfy a relationship of 0.70?(W1/W2)?0.95.

Abstract: A tread pattern of a pneumatic tire includes a pair of circumferential grooves and a plurality of siped lug grooves extending in a tire width direction between the pair of circumferential grooves and disposed at intervals in the tire circumferential direction. Each of the siped lug grooves includes a lug groove extending from a first circumferential groove of the pair of circumferential grooves and closed, and a sipe extending from a closed end of the lug groove toward a second circumferential groove and connected to the second circumferential groove. The plurality of siped lug grooves include at least one first siped lug groove extending while bending with an extension direction of the lug groove differing from an extension direction of the sipe, and at least one second siped lug groove extending linearly with the extension direction of the lug groove aligning with the extension direction of the sipe.

Abstract: A wear-condition-sensing device includes an element configured to generate voltage based on deformation of a tread portion during tire rotation, a voltage detection unit configured to detect the voltage generated by the element, a storage area configured to store waveform data over time of the voltage detected by the voltage detection unit, a calculation unit configured to calculate an index value of voltage change based on the waveform data stored in the storage area, and a determination unit configured to determine a progress condition of wear of the tread portion by comparing the index value calculated by the calculation unit with reference information.

Abstract: A pneumatic tire includes a run-flat reinforcing layer disposed on an inner side in a width direction of a carcass layer, and a second filler disposed between a turned back portion of the carcass layer and a rim cushion rubber. Additionally, a point on a tire outer circumferential surface is defined, the point is located at a position corresponding to 150% of a rim flange height from a measurement point of a rim diameter of a specified rim, a perpendicular line is defined, and the perpendicular line is drawn from the point to a tire inner circumferential surface. A rubber gauge (G1) of the run-flat reinforcing layer on the perpendicular line, and a rubber gauge (G2) of a region from the turned back portion of the carcass layer to a tire outer surface have the relationship 0<G1/G2?0.65.

Abstract: A pneumatic tire includes a land portion defined by two circumferential main grooves extending in the circumferential direction, lug grooves in the land portion, and a sipe between adjacent lug grooves. An outer side edge of the land portion in the width direction has a zigzag shape, and an inner side edge of the land portion in the width direction has a straight shape. The sipe extends continuously from the outer side edge to the inner side edge, and the sipe has a Z-shape with two bent portions, and a ratio of a distance in the width direction between a bent portion closer to a center line passing through a midpoint position of the land portion in the width direction and the center line to a width of the land portion in the width direction being 0 to 0.40.

Abstract: A pneumatic tire that is vulcanized using a bladder provided with a coating layer formed by a release agent, a noise absorber 6 being fixed on an inner surface of a tread portion 1 along a tire circumferential direction via an adhesive layer 7, and a thickness of the release agent detected by an electron microscope is 0.1 ?m to 100 ?m at least in a fixation region for the noise absorber 6.

Abstract: A tread portion of a pneumatic tire includes: an intermediate land portion being delimited by an inner circumferential main groove and an outer circumferential main groove on one side in a tire lateral direction across a tire center line as a boundary; and a side land portion adjoining the outer circumferential main groove and being provided outward of the outer circumferential main groove in the tire lateral direction. At least one land portion of the intermediate land portion and the side land portion has a swelling profile line. In a region of the land portion, a composite sipe is provided. In the composite sipe, a first sipe extending linearly in a sipe depth direction and a second sipe (S2) extending in a wave manner in the sipe depth direction are connected. The second sipe in the composite sipe is disposed so as to be connected to the outer circumferential main groove.