A tire includes a tread portion including a first tread edge, a first shoulder circumferential groove, and a first shoulder land portion demarcated by the first shoulder circumferential groove to include the first tread edge. The first shoulder land portion is provided with first shoulder lateral grooves extending from the first shoulder circumferential groove to the first tread edge. One of the first shoulder lateral grooves includes first and second groove walls which face each other, and a tie-bar. The tie-bar includes an outer surface extending along a ground contact surface of the first shoulder land portion, the outer surface being connected to the first and second groove walls. The outer surface includes a first edge connected to the first groove wall, and a second edge connected to the second groove wall, the second edge having a length smaller than a length of the first edge.

A tread pattern of a pneumatic tire includes circumferential main grooves, a land portion defined by the circumferential main grooves in the lateral direction, and sipes at intervals in a circumferential direction, the sipes connecting the circumferential main grooves with each other. Each of the sipes has a peak-like shape protruding to a first side in the circumferential direction. When, in a profile cross-section of the tread portion taken along the lateral direction, an arc passing through two land portion edge points at which a tread surface of the land portion is connected with groove wall surfaces of the circumferential main grooves and having a center point positioned on the equator line is set to a standard profile line, a profile line formed by the tread surface of the land portion is a swelling profile line protruding outward of the standard profile line in a radial direction.

The tire has, in a tread surface, at least one circumferential groove continuously extending in a tire circumferential direction, and a shoulder land portion partitioned with the circumferential groove and a tread ground contact edge, the shoulder land portion has a first width direction groove that extends in a tire width direction and via which the circumferential groove communicates with the tread ground contact edge, the first width direction groove has, in the first width direction groove, a second width direction groove that communicates with the first width direction groove, and respective groove widths of the circumferential groove, the first width direction groove and the second width direction groove satisfy a relational expression of the groove width of the circumferential groove >the groove width of the first width direction groove >the groove width of the second width direction groove.

A tire includes a plurality of land portions defined by a plurality of circumferential grooves, and each of the plurality of land portions has a plurality of lateral grooves crossing the land portion. Each of the plurality of lateral grooves is made up of a center region extending at an angle of inclination relative to a tread width direction and side regions extending at a smaller angle of inclination relative to the tread width direction than the center region, the side regions increasing in groove width toward the respective circumferential grooves. Each of the plurality of lateral grooves has a sipe having, only in the center region, a shallow portion with a smaller depth, the shallow portion being located at least near a boundary part between the center region and each of the side regions with a starting point of the shallow portion being apart from the boundary part.

A tyre includes a tread portion including an outboard middle land portion disposed between an outboard tread edge and a tyre equator. The outboard middle land portion includes first and second longitudinal edges, outboard middle lateral grooves extending from the first longitudinal edge and having terminal ends within the outboard middle land portion, first outboard middle sipes extending from the respective terminal ends of the outboard middle lateral grooves to the second longitudinal edge, and second outboard middle sipes extending from the first longitudinal edge toward the second longitudinal edge beyond the terminal ends of the outboard middle lateral grooves and terminating within the outboard middle land portion. The outboard middle land portion is not provided with any lateral grooves that extend from the second longitudinal edge toward the first longitudinal edge to reach an axial center location of the outboard middle land portion.

The present invention provides a pneumatic tire and a rubber composition for tires, which have improved durability at high temperatures and during high-speed running while ensuring good ice performance. The present invention relates to a pneumatic tire, including a tread, the tread including blocks having an average ripe density of 1.0 cm/cm.sup.2 or higher and an average height of 0.6 to 2.0 cm, the blocks containing a rubber composition having a tan at 100 C. of 0.179 or less as determined at an initial strain of 10%, a dynamic strain of 2%, and a frequency of 10 Hz, and has a ratio of the modulus at 100 C. to the modulus at room temperature of 69% or greater as determined in accordance with JIS K6251:2010.

A car tire having a tread that extends in axial direction for a width the tread including a central portion arranged across an equatorial plane, and two lateral portions opposed with respect to the central portion. The central portion is separated from the lateral portions of the tread by two circumferential grooves. The circumferential grooves have a width greater than about 6 mm. The central portion extends in axial direction for a width less than 20% of the width of the tread and includes a plurality of first sipes. Each lateral portion has a width greater than 30% of the width of the tread, and each lateral portion includes, furthermore, a plurality of transversal grooves. The transversal grooves of a lateral portion include at least a first inclined length that extends from a zone proximal to the respective circumferential grooves, moving away from the equatorial plane. The first inclined length has an inclination 60 with respect to equatorial plane. Each lateral portion includes a plurality of sipes. The density of the sipes decreases moving away from the equatorial plane.

The pneumatic tire according to the present embodiment includes a central land portion that is formed on the other side of the shoulder main groove in the tire width direction, and a plurality of inclined grooves that are provided in the central land portion at intervals in the tire circumferential direction. The inclined groove is a groove in which one end is open to the shoulder main groove and the other end terminates in the central land portion, and extends in a direction inclined with respect to the tire circumferential direction, and a length along the tire circumferential direction is 90% or more and 180% or less of a ground contact length on the tire equator when a normal load is applied.

The pneumatic tire according to the present embodiment includes a shoulder land portion that is formed between a ground contact end and the shoulder main groove, a central land portion that is formed on the other side of the shoulder main groove in the tire width direction, a plurality of first inclined grooves that are provided in the central land portion at intervals in the tire circumferential direction, and a plurality of second inclined grooves that are provided in the shoulder land portion at intervals in the tire circumferential direction. The first inclined groove of which one end is open to the shoulder main groove and the other end terminates in the central land portion extends in a direction inclined with respect to the tire circumferential direction, and the second inclined groove is open to the shoulder main groove and provided on an extension of the first inclined groove.

A pneumatic tire is provided in the tread portion with zigzag middle main grooves 4 and shoulder main grooves 5 to define middle land regions 7 therebetween. The middle main groove is composed of alternately-arranged, oppositely-inclined long first oblique segments 11 and short second oblique segments 12. The middle land regions are provided with middle transverse grooves 20 shallower than the middle main grooves. The first oblique segments are inclined axially outwardly toward the opposite direction to the intended tire rotational direction R. The middle transverse grooves are inclined to the same direction as the first oblique segments or in parallel with the tire axial direction. The axially inner end of each of the middle transverse grooves is connected to one of the second oblique segments so as to include at least a part of an axially outwardly protruding outside corner portion 4A of the middle main groove.