A tire comprises a tread portion 2. The tread portion 2 includes a tread ground contacting surface (2s) and at least one main groove 3 recessed from the tread ground contacting surface (2s) and extending continuously in a tire circumferential direction. The main groove 3 has a first groove wall 11. The first groove wall is provided with a recessed portion 15 recessed outwardly in a groove width direction from a groove edge of the main groove 3 on the tread ground contacting surface. The recessed portion 15 is formed of groove wall rubber 8 having a complex elastic modulus larger than that of base rubber 7 forming a main portion of the tread ground contacting surface (2s).

A tire comprises a tread portion 2. The tread portion 2 is provided with at least one main groove 3 extending continuously in a tire circumferential direction. A first groove wall 10, which is one of groove walls of the main groove 3, is provided with at least one first recessed portion 11 recessed outwardly in a groove width direction from a corresponding one of groove edges 6 of the main groove on a ground contacting surface of the tread portion 2. In the first recessed portion 11, a recess amount from the corresponding one of the groove edges 6 gradually decreases toward both sides in the tire circumferential direction from a deepest portion 15 recessed most outwardly in the groove width direction.

A pneumatic vehicle tire for utility vehicles has a profiled tread having two circumferential ribs that are adjacent and are separated by a circumferential groove of depth H formed from radially inner and outer extension sections of height H.sub.1 and H.sub.2. The groove in the radially inner extension section is a channel of height H.sub.1 and breadth B.sub.1, and in the outer extension section is configured, along its circumferential extent, with an alternating sequence of first and second circumferential regions. The two flanks in the first regions are each configured, in the transition to the outer surface of the rib, with a chamfer of height H.sub.4 such that H.sub.4<H.sub.2, and are spaced by a distance B.sub.2 along their radial extent in the outer extension section from radially inward to radially outward as far as the chamfer.

The present invention discloses a tire tread pattern provided with an anti-stone structure. The tread pattern is composed of an annular groove that is continuous along the circumferential direction and a pattern block, the annular groove is defined by a discontinuous first chamfered edge, a first polygonal surface parallel to the tread is arranged at a portion in the annular groove that is concave relative to the first chamfered edge, a second chamfered edge and a third chamfered edge of the first polygonal surface separately extend along the groove bottom direction to form two second polygonal surfaces, the two second polygonal surfaces and the first polygonal surface share a vertex S; and a groove bottom vein of the annular groove is zigzag along the circumferential direction. The stone discharge function is mainly embodied in two aspects: on one hand, the first polygonal surface parallel to the tread directly plays the role of stone discharge, on the other hand, as the angles of inclined planes on two sides of the annular groove are varied, stones are unlikely to form very stable fixing points therein, and thus are discharged easily in a tire travelling process, and accordingly good stone discharge performance of the tire is guaranteed.

Wheels, wheel assemblies, track systems, and vehicles are disclosed. The wheel has a hub portion and a tread portion disposed about the hub portion. The tread portion has a first plurality of grooves extending laterally from a first sidewall of the tread portion towards a second sidewall of the tread portion. The first plurality of grooves are circumferentially spaced along the tread portion. A radial depth of a first groove from the first plurality of grooves is greater proximate to the first sidewall than proximate to the second sidewall. The first groove has an ellipsoidal shape.

A heavy-duty vehicle tire with complex tread pattern, and is intended to improve the resistance to irregular wear of the tread thereof. The tire (1) has a tread (2) with at least one circumferential complex cut (6) formed by an alternation of external cavities (7) and internal cavities (8), each external cavity (7) having a length (L1), wherein the length (L1) of each external cavity (7) is equal to at least 1.5% and at most 12% of the external diameter (D) of the tire (1), as measured on the tire when new and free.

A vehicle tire includes a tread portion provided in the tread surface with a circumferentially continuously extending groove having a bottom and a pair of opposite side walls, wherein at least one of the side walls is provided with protrusions protruding into the groove and arranged in the tire circumferential direction. The protrusion has a gradually increasing part in which the area of the cross section of the protrusion being parallel with the tread surface is gradually increased toward the radially outer side of the tire.

A pneumatic tire is provided with a tread, a pair of sidewalls, and a pair of beads. A plurality of bending grooves are provided in an intermediate land located on the inner side of each shoulder main groove. Each of the bending grooves has one end portion opening to the shoulder main groove and the other end closed in the intermediate land. Each of the bending grooves is composed of a first tilting groove portion extending from the opening end portion to the bending portion and a second tilting groove portion extending from the bending portion to the closed end portion. The direction oriented from the opening end portion of the first tilting groove portion toward the bending portion coincides with the rotational direction, and the second tilting groove portion is bent toward the first tilting groove portion with the bending portion serving as an apex.

A pneumatic tire includes, in a tread portion, a main groove extending in a tire circumferential direction, a lateral groove extending in a tire width direction, and a land portion formed by the main groove and the lateral groove. The land portion is formed with a sipe extending in a tire width direction. The sipe has a wave-shaped portion of two cycles or less having a larger depth than both end portions on portion thereof excluding the both end portions.

A tire comprises a tread portion 2 comprising a shoulder main groove 5 extending on a side of a tread edge Te and comprising inner and outer groove walls 11 and 12. The inner groove wall 11 has an angle 1 with respect to a tread normal line in a cross section of the shoulder main groove 5 periodically increasing and decreasing in a tire circumferential direction so as to comprise concave and convex wall portions 16 and 17 arranged alternately in the tire circumferential direction. The outer groove wall 12 has an angle 2 with respect to a tread normal line in the cross section periodically increasing and decreasing in the tire circumferential direction so as to comprise convex and concave wall portions 22 and 21 arranged alternately in the tire circumferential direction. The angle 2 is larger than the angle 1 in any cross section of the groove.