A pneumatic tire includes, on a tread surface, at least one water absorption hole that includes a narrow-diameter portion on the tread surface side and a wide-diameter portion, on the hole bottom side, with a larger diameter than the narrow-diameter portion. In a reference state, the water absorption hole extends at an inclination relative to the normal direction of the tread surface, an average cross-sectional area of the narrow-diameter portion in a cross-section perpendicular to the extending direction of the narrow-diameter portion over the extension length thereof is 0.2 to 20 mm.sup.2, and the diameter of the wide-diameter portion is 1.4 or more times that of the narrow-diameter portion in the cross-section perpendicular to the extending direction of the narrow-diameter portion. In a transparent plan view from the tread surface side in the reference state, the opening of the narrow-diameter portion to the tread surface overlaps the wide-diameter portion.

In at least outermost side circumferential grooves on outermost sides in a tire widthwise direction among a plurality of circumferential grooves of a tread, a plurality of ridge portions are formed in a spaced relation with each other in a tire circumferential direction such that the plurality of ridge portions project from a groove bottom of the outermost side circumferential grooves and cross the outermost side circumferential grooves, and at least one of the widthwise grooves on the shoulder land portions in shoulder regions among the plurality of land portions partitioned by the circumferential grooves has, on a groove bottom thereof, a widened groove portion having an increased groove width. Therefore, the pneumatic tire in which the shoulder land portions at which the tread is most deformable and most liable to generate heat can be cooled effectively to suppress the temperature rise.

A pneumatic tire includes, on a tread surface, a plurality of circumferential main grooves extending in the tread circumferential direction, and a plurality of land portions each defined between circumferential main grooves adjacent in the tread width direction among the plurality of circumferential main grooves, or by a circumferential main groove and a tread edge. A widthwise groove (widthwise sipe) (circumferential sipe) includes a widened portion, on the groove bottom side (sipe bottom side), at which the groove width (sipe width) is larger than on the tread surface side.

The storage modulus of tread rubber located in a tire radial direction region including at least a reference depth position is larger than a storage modulus of tread rubber located in regions inward and outward in the tire radial direction from the tire radial direction region.

A pneumatic tire includes, on a tread surface, circumferential main grooves extending in the tread circumferential direction, rib-like land portions defined between circumferential main grooves adjacent in the tread width direction or by circumferential main grooves and tread edges, and resonators, arrayed circumferentially in the rib-like land portions, each including a narrowed neck and an air chamber. The narrowed neck is a widthwise sipe opening at one end to the circumferential main groove that defines the rib-like land portion, extending therefrom in the tread width direction, and terminating at another end within the rib-like land portion. The air chamber is a circumferential sipe connected to the other end of the widthwise sipe, extending in the tread circumferential direction, terminating at both ends within the rib-like land portion, and including a first widened portion, at the sipe bottom, with a larger sipe width than at the tread surface side.

A pneumatic tire includes, on a tread surface, circumferential main grooves extending in a tread circumferential direction, and land portions defined between circumferential main grooves adjacent in a tread width direction among the circumferential main grooves, or by a circumferential main groove and a tread edge. The land portions include widthwise grooves (and/or widthwise sipes), extending in the tread width direction, each including a gradually decreasing groove (sipe) width portion in which a groove (sipe) width gradually decreases from the tread surface towards an inner side in the tire radial direction, a constant groove (sipe) width portion that extends from the gradually decreasing groove (sipe) width portion towards the inner side in the tire radial direction and has a constant groove (sipe) width, and a branched groove (sipe) portion branching and extending from the constant groove (sipe) width portion towards the inner side in the tire radial direction.

A tire comprises a tread portion whose position when mounted on a vehicle is specified. The tread portion includes an inner crown land region defined between a crown main groove and an inner shoulder main groove. The inner crown land region includes crown lateral grooves, first inner crown sipes, second inner crown sipes each extending from the inner shoulder main groove toward the crown main groove and having an inner end terminating within the inner crown land region, and third inner crown sipes each extending from the crown main groove toward the inner shoulder main groove and having an outer end terminating within the inner crown land region. The crown lateral grooves each have a length in a tire axial direction larger than that of each of the second inner crown sipes.

To provide a pneumatic tire capable of improving rut running performance. In a pneumatic tire according to an embodiment, a shoulder block provided in a shoulder region of a tread portion is provided with a plurality of sipes which are formed at intervals in a tire circumferential direction to extend in a tire width direction. In the plurality of sipes, a dimple is provided on an outside in the tire width direction in relation to each tire ground contact end in a communication state. The dimple includes a portion formed with a wide width from a connection portion with the sipe toward the outside in the tire width direction and maximum width portions of the plurality of dimples are disposed to be offset in the tire width direction.

A vulcanization mold including blades having a distal end side and pullout is performed smoothly without causing any failure and a pneumatic tire. A vulcanization mold in which a blade has a proximal end, a blade distal end side expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the proximal end portion and the blade distal end side is a vulcanization mold in which a sweep area is the difference where a cross sectional area of the blade connection is subtracted from an area blade distal end side to a mold surface with a width equal to a maximum width of a thickness of the blade distal end side in a cross sectional shape perpendicular to a tire widthwise direction of the blade is smaller in circumferential end side regions than in a circumferential central side region of the sector mold.

A vulcanization mold in which a blade has a blade proximal end portion, a blade distal end side thick portion expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the portions to each other, is a vulcanization mold wherein a sweep area that is the difference where a cross sectional area of the blade connection portion is subtracted from an area from the blade distal end side thick portion to a mold surface with a width equal to a maximum width of a thickness of the blade distal end side thick portion in a cross sectional shape perpendicular to a tire widthwise direction of the blade is smaller at the blades in circumferential end portion side regions than at the blades in a circumferential central portion side region of the sector mold. Further, a pneumatic tire is manufactured using the vulcanization mold.

A vulcanization mold is a mold including blades having a distal end side thick portion and pullout is performed smoothly by the mold without causing any failure, and a pneumatic tire. A vulcanization mold in which a blade or has a blade proximal end portion, a blade distal end side thick portion expanded in a thicknesswise direction on the distal end side, and a blade connection portion that connects the blade proximal end portion and the blade distal end side thick portion to each other is a vulcanization mold in which a blade density that is a number of blades implanted on a sector mold per unit length in a circumferential direction is lower at the blades in circumferential end portion side regions than at the blades in a circumferential central portion side region of the sector mold. Further, a pneumatic tire is manufactured using the vulcanization mold.