Heavy goods vehicle tire, having a crown portion covered radially on the outside by a tread, this tread having at least two cut-outs, the central portion of the tread having a width Lc of between 35% and 70%, the crown portion comprising a reinforcement having at least two working layers having reinforcing elements, these reinforcing elements consisting of UHT-grade threads, having a mechanical breaking strength R satisfying the following relation: R≥(4180−2130×D), where D is the diameter of the thread expressed in millimetres, this tread being formed of at least two layers of superimposed material, the material forming the first layer with a breaking elongation of more than 600% at a temperature of 60° C., this tread being such that, in the central portion, the cavity ratio per unit volume is not more than 10% and the surface cavity ratio as new is not more than 10%.

Steering stability performance on dry road surfaces and steering stability performance on wet road surfaces are improved. A land portion width Wcc of a center land portion (31) and a land portion width Wco of an outer side middle land portion (32) satisfy a relationship of Wcc<Wco. In addition, a ground contact surface (10) of each of the outer side middle land portion (32) and an outer side shoulder land portion (34) is formed to protrude toward an outer side in a tire radial direction with respect to a reference profile PRco, PRso, and a protruding amount Hco of the outer side middle land portion (32) and a protruding amount Hso of the outer side shoulder land portion (34) satisfy a relationship of Hco<Hso.

A tyre includes a tread portion provided with a circumferential groove and a lateral groove. The at least one lateral groove includes a connected portion connected to the circumferential groove. The circumferential groove includes a groove bottom provided with groove bottom protruding portions protruding outwardly in the tyre radial direction. Each groove bottom protruding portion includes a first surface portion extending in the tyre radial direction and facing a first circumferential direction, and a second surface portion arranged on a second circumferential direction opposite to the first circumferential direction and extending at a larger angle with respect to the tyre radial direction than that of the first surface portion. In a tread plan view, at least a part of the groove bottom protruding portions is located in a lateral-groove extended region in which the connected portion is extended into the circumferential groove along the tyre axial direction.

A tread portion of a pneumatic tire includes a columnar wear measurement magnet that has magnetic flux density or magnetic field strength formed thereby decreased due to wear thereof along with wear of tread rubber of the tread portion and a columnar reference magnet provided at a position where the columnar reference magnet is not worn with the wear of the tread rubber. The wear measurement magnet and the reference magnet extend from a tread surface side toward a tire cavity region of the pneumatic tire, and an end of the reference magnet on the tread surface side is located farther from a tread surface where the tread portion contacts the ground than an end of the wear measurement magnet on the tread surface side.

A pneumatic tire can suppress uneven wear of the tire and can improve traction performance on snow. Land portions (12A, 12B, 12C), between a pair of outermost side circumferential grooves (11d, 11d) on the outermost sides in the tire widthwise direction among a plurality of circumferential grooves (11a, 11b, 11c, 11d) extending in the tire circumferential direction, are divided into a plurality of blocks (14A, 14B, 14C) by widthwise grooves (13a, 13b, 13c). A pair of groove side faces (13ap, 13aq; 13bp, 13bq; 13cp, 13cq) opposed to each other in the widthwise grooves (13a, 13b, 13c) are bent at bent portions (Kp, Kq) thereof.

Provided is a pneumatic tire. At least three blocks of a plurality of blocks formed on a tread portion, which include an outermost block positioned on an outermost side in a tire lateral direction and are adjacent to each other in the tire lateral direction, and at least two longitudinal grooves positioned between the at least three blocks are arranged on a platform, which is raised from a groove bottom of a lateral groove, has a flat top surface, and has a shape protruding toward both sides in a tire circumferential direction with respect to the at least three blocks. On a groove bottom of a longitudinal groove adjacent to the outermost block, a raised bottom portion raised from the groove bottom of the longitudinal groove is provided. The raised bottom portion connects the outermost block and the block adjacent to the outermost block.

A tyre comprises a tread portion comprising a shoulder main groove and a shoulder land region. The shoulder land region includes an outer region, a middle region, and an inner region. The shoulder land region is provided with a plurality of shoulder sipes having components in a tyre axial direction. A sipe ratio of the middle region is smaller than the sipe ratio of the outer region and the sipe ratio of the inner region.

A pneumatic tire is provided. A carcass layer includes carcass cords formed of organic fiber cords obtained by intertwining a filament bundle of organic fibers, and includes turn-up portions formed by turning up end portions of a pair of bead portions to an outer side in a tire width direction. The carcass cords have an elongation at break (EB) satisfying EB≥15%. A portion of a belt layer located in a width range of 10% of a width of a second widest belt in the belt layer on each of a left side and a right side of a tire equator line in a tire width direction has a belt angle (θc) satisfying 0.349 rad≤θc≤0.56 rad. The elongation at break (EB) of the carcass cords and the belt angle (θc) satisfy 800<1140×θc+20×EB<1400.

A tire includes a tread portion including a first cap rubber layer forming a ground contact surface and having a loss tangent tan δ1, and a second cap rubber layer disposed inwardly in a tire radial direction of the first cap rubber layer and having a loss tangent tan δ2, the loss tangent tan δ2 being greater than the loss tangent tan δ1. The tread portion is provided with a plurality of sipes opening to the ground contact surface, The plurality of sipes, at least partially, extends inwardly in a tire radial direction from the ground contact surface to a. location beyond a boundary between the first cap rubber layer and the second cap rubber layer, and a maximum length L2 of the plurality of sipes in the second cap rubber layer is smaller than a length L1 of the plurality of sipes at the ground contact surface.

A tire having a tread portion, wherein the tread portion can include a pair of shoulder circumferential grooves, a pair of crown circumferential grooves, and a pair of middle land portions. Each middle land portion can include a plurality of middle sipes. Each middle sipe can have a chamfered portion at at least one of sipe edges on both opposite ends thereof. The chamfered portion can extend from the crown circumferential groove to the shoulder circumferential groove. A first chamfered width of the chamfered portion at a first one of the opposite ends on a crown circumferential groove side can be greater than a second chamfered width of the chamfered portion at a second one of the opposite ends on a shoulder circumferential groove side.