The tire has a tread portion 2 comprising a plurality of main grooves and a first land portion 11 divided by the main grooves. The first land portion 11 comprises a plurality of first blocks 15 divided by first lateral grooves 14. The first lateral groove 14 is provided with a first tie bar 19 raising from a part of the groove bottom excluding its end portions in the tire axial direction. The first block 15 is provided with a first sipe 20 inclined with respect to the tire axial direction to the same orientation over its entire length from a first longitudinal edge 26 to a second longitudinal edges 27 of the block. The first sipe 20 is composed of a first portion 21 extending from the first longitudinal edge 26, a second portion 22 extending from the second longitudinal edge 27, and a third portion 23 between the first portion 21 and the second portion 22. The angle with respect to the tire axial direction of the third portion 23 is greater than the angles with respect to the tire axial direction of the first portion 21 and the second portion 22.

Provided is a pneumatic tire for a motorcycle that is capable of early exhibiting performance of a new tire and that enables it to be visually confirmed that the new tire is worn to a degree that the tire can fully exhibit the performance. The pneumatic tire for a motorcycle includes a tread portion 1 formed into a ring shape, in which the tread portion 1 is provided with shallow grooves 2 having a width of 0.1 to 2.0 mm and a depth of 0.1 to 2.0 mm and extending in a tire circumferential direction.

A tire includes a tread portion including a first land portion defined between circumferentially extending first and second edges. The first land portion is provided with first and second lateral grooves respectively extending from the first and second edges and terminating within the first land portion and a circumferentially extending first longitudinal narrow groove in communication with the first and second lateral grooves. Each of the first and second lateral grooves includes a wide-width portion and a narrow-width portion. The wide-width portion of each of the first lateral grooves extends from the first edge and the wide-width portion of each of the second lateral grooves extends from the second edge. The first longitudinal narrow groove passes through the narrow-width portion of each of the first and second lateral grooves without passing through the wide-width portion of each of the first and second lateral grooves.

A pneumatic tire includes a tread portion including a pair of first main grooves, a pair of second main grooves, a first land portion between the first main grooves and a pair of second land portions each sectioned adjacent one of the pair of first main grooves and one of the pair of second main grooves. The first main grooves extend in a trapezoidal wave manner including inner elements, outer elements and inclined connecting elements. One of the second land portions is provided with a second lateral groove opened at one of the outer elements. The first land portion is provided with a recess having an opening at the one of the outer elements. In a tire circumferential direction, a center of the opening of the recess is located at a position different from a position of an extension line of a centerline of the second lateral groove.

A pneumatic tire includes circumferential main grooves extending in the tire circumferential direction on the tread surface, and in widthwise outermost land portions, widthwise grooves extending from the tread edges inward in the tire width direction and widthwise sipes extending from the tire widthwise inner edge of the widthwise grooves inward in the tire width direction and connecting to the circumferential main groove. Each widthwise sipe includes a widened portion, by the sipe bottom, with a larger sipe width than at the tread surface. A rectangle ratio is 0.8 or more. Each widthwise sipe extends at a first angle relative to the tire width direction in plan view of the tread surface. In a tire radial region containing the widened portion, the widened portion extends at a second angle smaller than the first angle relative to the tire width direction, or partially extends along the tire width direction.

A mould for manufacturing a tire includes a plurality of segments including a first segment. The first segment has a first end, an opposite second end, primary lamella blades that are arranged close to the first end, and secondary lamella blades that are arranged far from both the ends. An average of the heights of the primary lamella blades is at least 75% of an average of the heights of the secondary lamella blades. A bending strength of the primary lamella blades against bending in a circumferential direction of the mould is greater than a bending strength of the secondary lamella blades against bending in the circumferential direction of the mould. A tire is manufactured by the mould.

The pneumatic tire includes, on a tread surface, at least two circumferential main grooves and at least one rib-like land portion defined by two of the circumferential main grooves. The rib-like land portion includes neither grooves nor sipes that extend to include a widthwise center line of the rib-like land portion. The rib-like land portion includes a one-end-open sipe and a both-end-closed sipe. The one-end-open sipe has a widthwise sipe portion and a circumferential sipe portion, the widthwise sipe portion extending in tire width direction from one end of the one-end-open sipe and being terminated within the rib-like land portion, and the circumferential sipe portion being located closer to the widthwise center line than the both-end-closed sipe, extending in tire circumferential direction from the widthwise sipe portion, and being terminated at another end of the one-end-open sipe.

The invention provides for a heavy truck tire tread (1) having a longitudinal direction, a lateral direction and a thickness direction, said tread having a ground-engaging contact surface (CS) and comprising at least four main longitudinal grooves (3, 4, 5, 6) defining at least five main longitudinal ribs (9, 10, 11, 12, 13), the at least four main longitudinal grooves comprising at least one and not more than three open grooves (3, 6) and at least two partially hidden grooves (4, 5), each of said at least two partially hidden grooves comprising openings (41, 51) to the ground-engaging contact surface (CS) and an undersurface channel (42, 52) that is connected to the openings by ducts (43, 53) extending substantially in the thickness direction, longitudinal sipes (44, 54) extending substantially along the longitudinal direction connecting successive openings to the channel, said tread comprising at least two non-shoulder main ribs (10, 11, 12), said at least two non-shoulder main ribs comprising lateral sipes (105, 115, 125) extending in the lateral direction, the tread comprising at least 120 of said lateral sipes, wherein for each partially hidden groove: a total surface area of all openings is less than 200 cm2; an average height of said channel is greater than 5 mm; and an average section area of said channel is greater than 15 mm2.

Provided is a pneumatic tire including a tread portion, sidewall portions, and bead portions. The tread portion comprises a center main groove extending in the tire circumferential direction and a shoulder main groove located outward of the center main groove and extending in the tire circumferential direction. A land portion is defined between the center main groove and the shoulder main groove. The center main groove has a zigzag shape in the tire circumferential direction. Lug grooves extending inward from the shoulder main groove in the tire lateral direction and terminating without communicating with the center main groove are provided in the land portion. A bent portion bent toward a first side in the tire circumferential direction is formed at a terminating end of each of the lug grooves. Narrow grooves extending discontinuously in the tire circumferential direction without communicating with the bent portions are formed in the land portion.

The invention provides three-dimensional tread kerfs for a tire, which have improved braking performance and drainage characteristics on a wet road while maintaining the functions of kerfs on the snow. Disclosed are tread kerfs for a tire, each tread kerf having a kerf opening formed in a block of a tire tread; a tubular-shaped flow channel formed in the lower part of the kerf and having a width larger than the width of the kerf opening; and a connecting gap connecting the kerf opening and the flow channel. In the tread kerf, the kerf opening is formed to have a zigzag wave shape along the tire circumferential direction in a tread block, and the zigzag wave is formed such that the amplitude decreases downward along the depth direction of the block. According to the invention, the tread kerfs for a tire have a function of maintaining the block rigidity that may be deteriorated as a result of insertion of kerfs into tread blocks and also maintaining the block rigidity that may increase with the wear of the tire, at a certain level, and also have an effect of absorbing the water existing between the tire tread and the road surface when the tire runs on a wet road, thereby allowing the tire tread to be brought into direct contact with the road surface, and causing the absorbed water to be easily discharged through the lateral sides of the tread blocks.