A pneumatic tire comprises a tread rubber having a hardness less than 60 degrees. The tread portion comprises two shoulder circumferential grooves, two shoulder land portions, and one or more crown land portions therebetween. The shoulder land portion is divided into shoulder blocks by shoulder lateral-groove-like tread-pattern elements having a depth of not less than 50% of the shoulder circumferential groove depth. At least one of the crown land regions is divided into crown blocks by crown lateral-groove-like tread-pattern elements having a depth of not less than 50% of the shoulder circumferential groove depth. When a value obtained by dividing a ground contact area of one block by a maximum depth of the lateral-groove-like tread-pattern elements which divide the block is defined as the block area per unit depth, the block area per unit depth of the shoulder block is smaller than that of the crown block.

A tire tread and a tire are provided, more particularly, a tire having a tread or other elastomeric component within enhanced composite material properties, including, but not limited to, modulus ratio, percent elongation at break, and/or tan delta, wherein the tire, tread or other elastomeric component comprise composites characterized by well dispersed reinforcing filler, which can be indicated by macrodispersion.

A tire in which an elongation at break and/or compounding of a rubber composition of a tread.

In a tire, a tread includes a cap layer forming a part of an outer surface of the tire, a base layer disposed inwardly of the cap layer in a radial direction, and an intermediate layer disposed between the cap layer and the base layer in the radial direction. A loss tangent of the intermediate layer at 30° C. is less than a loss tangent of the cap layer at 30° C. and a loss tangent of the base layer at 30° C. is less than the loss tangent of the intermediate layer at 30° C. The tread includes at least two three-layer body portions formed of the cap layer, the intermediate layer, and the base layer, and at least one two-layer body portion that is formed of the cap layer and the base layer and disposed between a first three-layer body portion and a second three-layer body portion.

In a state in which a pneumatic tire is mounted on a specified rim, inflated to 92% of a specified internal pressure, and loaded with a load of 75% of the maximum load capacity, an average thickness of an undertread rubber is smaller in a center region than in a shoulder region, a ratio (CAO/UAO) is 0.15 or more and 0.95 or less, a ratio (UAI/UAO) is less than 1, and a ratio (L/W) is 0.29 or more and 0.51 or less, in a tire meridian cross-sectional view, where CAO, UAO and UAI are cross-sectional areas of the cap tread rubber, the undertread rubber, and the undertread rubber in the center region, respectively, L is a tire width direction dimension from a defined intersection point to a ground contact edge, and W is a tire width direction dimension of each shoulder region.

Provided is a heavy duty pneumatic tire having excellent abrasion resistance. The heavy duty pneumatic tire includes a tread portion including a rubber composition containing: an isoprene rubber; a butadiene rubber; a styrene-butadiene rubber; and a carbon black having an average particle size of 20 nm or less and/or a cetyltrimethylammonium bromide adsorption specific surface area of 130 m.sup.2/g or more, the tread portion having a land ratio of 81% or higher.

The present invention provides a rubber composition for treads, containing: a rubber component including an isoprene-based rubber and polybutadiene rubber; silica; carbon black; a terpene-based resin; and a water-soluble fine particle and/or a foaming agent, the terpene-based resin having a softening point of 70-150° C., an α-pinene unit content of 65-100% by mass, and a β-pinene unit content of 0-35% by mass, the rubber component including, based on 100% by mass thereof, 20-80% by mass of the isoprene-based rubber and 20-80% by mass of the polybutadiene rubber, with a combined amount of the isoprene-based rubber and the polybutadiene rubber of 90% by mass or more, the rubber composition containing, per 100 parts by mass of the rubber component, 20-200 parts by mass of the silica, 0.1-50 parts by mass of the carbon black, and 0.1-50 parts by mass of the terpene-based resin.

A method for forming a composite tread is described, wherein the method includes the steps of selecting a first tread compound having a first desired tread property, and selecting a second tread compound having a second desired property, forming a tread by winding a dual layer strip having a first layer formed of the first tread compound and a second layer formed of the second compound, wherein the tread has a first and second zone, wherein each zone is formed by spirally winding the dual layer strip, wherein the first zone is formed of a dual layer strip having a strip ratio of the volumetric proportion of the first compound to the second compound used to form the dual layer strip, wherein the second zone has a different strip ratio than the first zone by varying the volumetric proportion of the first compound to the second compound.

A tire having a tread comprising at least one circumferential reinforcing element 8 of which at least part of the meridional cross section has the shape of a triangle, the vertex of which is oriented radially towards the outside, the circumferential reinforcing element 8 comprising a skin 81 and a core 82, the skin material being at least twice as stiff as the core material.

A tire, comprising: a plurality of shoulder blocks side by side in a tire circumferential direction on the outermost side in a tire width direction, by a main groove extending in the tire circumferential direction in a tread surface of a tread portion and by a plurality of subsidiary grooves intersecting the main groove; and a plurality of sipes extending along the tire width direction in the tread surface of each of the plurality of shoulder blocks and provided side by side in the tire circumferential direction. Each of the plurality of sipes includes at least an end portion terminated on an outer side in the tire width direction, a cap tread rubber forming the tread surface has JIS hardness Ha of in a range of not less than 45 and not greater than 55, a snow traction index in a 0° direction is less than 180.