Provided is a pneumatic tire including: a plurality of main grooves each having a zigzag shape and extending in a tire circumferential direction; and a land portion defined by the main grooves adjacent to each other and having a rib structure that is continuous with the tire circumferential direction. The land portion includes first and second lug grooves having a semi-closed structure. A maximum length L21 of the first lug groove in a tire width direction has the relationship 1.30≤L21/L22≤2.30 with respect to a maximum length L22 of the second lug groove.

The tire can have a tread portion. The tread portion can include a first shoulder circumferential groove and a first shoulder land portion. In the first shoulder land portion, a plurality of first shoulder lateral grooves can be disposed. At least one of the first shoulder lateral grooves can include an inner end connected to the first shoulder circumferential groove, a maximum groove width portion, and an outer portion. The maximum groove width portion can be at almost the center, in a tire axial direction, of a ground contact surface of the first shoulder land portion. A groove width at the inner end and a groove width, on a first tread end, of the first shoulder lateral groove can each be less than the maximum groove width. A groove width of the outer portion can be reduced outward in the tire axial direction.

A tread pattern of a pneumatic tire includes an inner circumferential main groove and an outer circumferential main groove that have groove walls extending in a tire circumferential direction while the angle of the groove walls relative to a contact surface varies with a predetermined amplitude, an inner lug groove extending from the inner circumferential main groove toward the outer circumferential main groove, an outer lug groove extending from the outer circumferential main groove toward the inner circumferential main groove, and a sipe configured to communicate the inner lug groove with the outer lug groove. A pair of chamfered surfaces are provided on walls of the sipe along an extension direction of the sipe on the contact surface.

A tire for running on rough terrain for which an intended tire rotational direction is specified. The tread portion is provided with blocks raised from a tread base portion. Each block has a first side wall surface comprising a radially outer portion extending substantially straight and radially inwardly, while inclining toward the toe side in the intended tire rotational direction, and a radially inner portion extending from the radially outer portion to the tread base portion while curving in an arc shape. The radially outer portion has a radial length of from 30% to 70% of a radial height of the block.

A tire for running on rough terrain for which an intended tire rotational direction is specified, and which comprises a tread portion provided with crown blocks disposed on the tire equator. Each of the crown blocks comprises a V-shaped crown block main portion which bends convexly toward a circumferential direction opposite to the intended tire rotation direction, and only two crown fin portions projecting from the crown block main portion toward the above-said circumferential direction opposite to the intended tire rotation direction.

A tread for a tire includes a circumferential center tread region comprising a plurality of block elements arranged in a symmetric pattern on opposite sides of a tire equatorial centerplane, a pair of circumferential shoulder tread regions each comprising a plurality of block elements arranged in a symmetric pattern on opposite sides of a tire equatorial centerplane, a leading edge first serrated construction disposed on a leading edge of one of the block elements, and a trailing edge second serrated construction disposed on a trailing edge of one of the block elements.

A pneumatic tire that lowers a temperature of a tread portion by promoting heat dissipation thereof is provided. On a tread surface, a narrow groove is formed extending in a direction inclined with respect to a tire circumferential direction and having a width smaller than a depth, and an inflow portion opening to the tread surface is also formed on at least one of walls of the narrow groove facing each other in the tire circumferential direction.

A pneumatic vehicle type for passenger vehicles or vans having at least one wide circumferential groove (1, 1′, 1″, 1″′), which runs in the circumferential direction and is bounded on the tread periphery by two edge borders (1a, 1′a, 1″a, 1′″a) which run parallel to one another and linearly, and has a groove base (13, 13′, 13″) as well as two groove edges (9, 10, 9′, 10′, 9″, 10″), wherein elements (11, 12, 11′12′, 11″, 12″) which project on the groove edges (9, 10, 9′, 10′, 9″, 10″) are formed alternately in the circumferential direction on one or other of the groove edges (9, 10, 9′, 10′, 9″, 10″), wherein each projecting element (11, 12, 11′, 12′, 11″, 12″) has a groove edge section (9a, 10a, 9′a, 10′a, 9″a, 10″a) lying opposite on the opposite groove edge (9, 10, 9′, 10′, 9″, 10″), which groove edge section (9a, 10a, 9′a, 10′a, 9″a, 10″a) runs least essentially in the radial direction starting at the edge border (1a, 1′a, 1″a, 1′″a) as far as the groove base (13, 13′, 13″), wherein the groove base (13, 13′, 13″) runs in a meandering or corrugated shape along and between the projecting elements (11, 12, 11′, 12′, 11″, 12″), wherein the projecting elements (11, 12, 11′, 12′, 11″, 12″) are essentially of wedge-like design and are bounded by oblique faces (14, 14′, 14″) which extend in the axial direction as far as the groove base (13, 13′, 13″) and run in the circumferential direction at least essentially over the circumferential extent of the elements (11, 12, 11′, 12′, 11″, 12″), wherein the projecting elements (11, 12; 11′,12′,11″,12″) are provided in at least two different circumferential lengths (L.sub.1 to L.sub.5, L.sub.1′ to L.sub.5′; L.sub.1″ to L.sub.5″) and follow one another according to a specific sequence over the circumference of the circumferential groove (1, 1′, 1″, 1″′).

Tread for heavy-duty vehicle tire, having tread surface with at least one cavity forming a hidden channel which forms an additional groove after an amount of wear, each channel extended towards tread surface in the new state along its entire length by a sipe of small width, at least one channel having plurality of extensions from this channel towards tread surface to place the channel and the outside of the tread into communication from an amount of partial wear of the tread, each extension being a secondary channel having a first opening of elongate shape with a minimum dimension I0 and a maximum dimension Lo that opens onto tread surface and a second opening that opens into channel, wherein for at least one channel provided with extensions, each first opening of these extensions is formed by a side of the sipe that extends the channel.

A tire includes an annular tread portion with a circumferentially extending groove having bridge structures at circumferential intervals about the groove and contoured pockets therebetween. Each pocket has curved transition surfaces separating the bridge structures from curved base surfaces of the pocket. The curved transition surfaces have radii of curvature between 2.0 mm and 4.0 mm. The curved base surfaces may radii of curvature between 4.0 mm and 8.0 mm.