A pneumatic tire is provided, the pneumatic tire including a tread portion, sidewall portions, and bead portions, and the pneumatic tire includes, in the tread portion, a center main groove extending in a tire circumferential direction and a shoulder main groove extending in the tire circumferential direction on the outside of the center main groove; a land portion between the main grooves; lug grooves extending inward in a tire lateral direction from the shoulder main groove and terminating without communicating with the center main groove; a bent portion bending toward one side in the tire circumferential direction, at a terminating end of each of the lug grooves; and a raised bottom portion included in the bent portion, creating a level difference with respect to a lug groove, and being shallower than the lug groove.

A pneumatic tire includes a land portion provided in a tread portion and including a recess recessed inward in a tire radial direction. The recess includes three or more sides defining an opening that opens to a ground contact surface of the land portion and forming a polygon, and three or more side surface portions defined by the sides and line segments connecting respective vertexes of the sides and a bottom point provided on an inner side of the ground contact surface in the tire radial direction. The side surface portions are formed so as to approach the bottom point as the side surface portions extend inward in the tire radial direction from the ground contact surface.

A vulcanization mold is for a tire in which a plurality of sipes are arranged in a tire circumferential direction. The vulcanization mold includes a tread mold having a plurality a blades, for forming the sipes, provided on a tread forming surface. The tread mold is composed of a plurality of segments divided in the tire circumferential direction such that the segments are movable in a tire radial direction, and the number of divisions of the segments is 17 or more and 29 or less.

The tire includes a lateral groove formed in a tread section and extending in a tire width direction. One groove wall forming the lateral groove includes an inclined surface with curved shape. The inclined surface has an inclination angle, the inclination angle being an angle with respect to a tire radial direction from a groove bottom to a tread surface in a cross section perpendicular to a tire axial direction, that gradually increases from an inner side in the tire width direction on a tire equatorial line side to an outer side in the tire width direction.

A tire comprises a tread portion comprising a circumferentially arranged blocks divided by lateral grooves. Each block has a block side wall and a block tread. Each lateral groove comprises an axially outer first portion, an axially inner second portion, and a connect portion at which the first portion and the second portion are connected with each other so that each block is provided with a convex corner portion which is convex toward the outside of the block at the connect portion. In the convex corner portion, the block side wall comprises a first side wall extending along the first portion, a second side wall extending along the second portion, and a substantially triangular third side wall intersecting the first side wall, the second side wall and the block tread. The third side wall terminates radially outside the groove bottom of the lateral groove.

A tire has a tread portion including a first land portion including first and second circumferential edges and and a tread surface. On the first land portion, curved grooves are provided in a tire circumferential direction. Each curved groove extends from a first end on the first circumferential edge side, terminates at a second end within the first land portion, and includes first and second curved portions and on the first end and second end sides, respectively. The first curved portion is an arc curve with a radius of curvature having a center on the first circumferential edge side of the curved groove. The second curved portion is an arc curve with a radius of curvature having a center on the second circumferential edge side of the curved groove.

The tread has a contact face that is provided with at least one circumferential groove and a transverse grooves opening to the contact face and delimiting contact elements. The tread has a center region and shoulder regions and is provided with at least one compressive contact element among the contact elements. A volumetric void ratio of the compressive contact element in a unit region surrounded by a center of the at least one circumferential groove and a center of the transverse grooves delimiting the compressive contact element is at least equal to 25%. An aspect ratio, which is defined as a ratio of a surface of the compressive contact element supposed to contact with ground divided by a sum of a surface area of the compressive contact element touching with air other than the surface of the compressive contact element supposed to contact with ground, is at most 70%.

A tire tread pattern includes: first sipes in a first land portion between first and second circumferential main grooves; first chamfered surfaces in which a tread surface of the first land portion is inclined toward a first circumferential main groove side in an end portion in a width direction, the first sipes opening to the first chamfered surfaces; second sipes in a second land portion on an opposite side of the first land portion with respect to the second circumferential main groove; and second chamfered surfaces in which a tread surface of the second land portion is inclined toward a second circumferential main groove side in an end portion in the width direction, the second sipes opening to the second chamfered surfaces. The first and second. chamfered surfaces are greater in length in the circumferential direction than in the width direction.

A tire 2 has a nominal aspect ratio of 65% or less. The tire 2 includes a tread 4, a pair of sidewalls 6, a pair of chafers 8, a pair of beads 10, and a band 40. The band 40 includes a full band 44 having ends 44e opposed to each other across an equator plane, and a pair of edge bands 46 located outward of the ends 44e of the full band 44 in a radial direction. An outer surface of each chafer 8 has a fitting recess 62 into which a flange F of a rim R fits.

A tread for a tire includes a first circumferential main groove, a second circumferential main groove, a third circumferential main groove, and a fourth circumferential main groove. The fourth main groove has a stabilizing structure for increasing tread stiffness. The stabilizing structure has a circumferentially extending subgroove in a radially innermost bottom of the fourth circumferential main groove. The subgroove is axially offset a predetermined amount from a centerline of the fourth circumferential main groove.