A pneumatic tire includes circumferential grooves, lug grooves, land portions defined by the circumferential grooves and the lug grooves, and a narrow groove in the land portions that extends in a circumferential direction. At least one of the circumferential grooves that defines the land portions in which the narrow groove is disposed has an amplitude in a width direction while extending in the circumferential direction to be formed in zigzag shape including long and short portions having relatively different lengths. The narrow groove has one or more bent portions where an extension direction changes in the land portions to include a long portion and a short portion having relatively different lengths. The long portion of the narrow groove has an inclination direction in the width direction with respect to the circumferential direction in a direction opposite to the long portion of the at least one of the circumferential grooves.

The subject invention discloses a tire (1) having at least one sipe pattern comprising, in the circumferential direction of the tire (1), one or more straight sipes (15) and two or more inclined sipes (17, 19, 37, 39); wherein at least one straight sipe (15) is arranged between two or more inclined sipes (17, 19, 37, 39).

A tire includes a tread portion including a main groove, a first block and a second block which are adjacent to one another in a tire axial direction through the main groove. The main groove includes first groove elements and second groove elements having groove widths smaller than that of the first groove elements. The first block includes a first ground contact surface, a first sidewall facing one of the second groove elements, a first corner portion between the first ground contact surface and the first sidewall, and a first recess being cut out the first corner portion locally. The second block includes a second ground contact surface, a second sidewall facing said one of the second groove elements, a second corner portion between the second ground contact surface and the second sidewall, and a second recess being cut out the second corner portion locally.

Heavy-duty vehicle tire, with tread (1) of thickness E of wearable material and surface (10) for contact with a roadway, tread (1) having a raised element (41, 42) with of sipes (5) circumferentially distributed and inclined. Tread (10) material is an elastomer based on natural rubber or synthetic polyisoprene with a majority of cis-1,4 linkages and on a reinforcing filler predominantly of silica, with a content expressed in phr (parts by weight per hundred parts of elastomers) of greater than 40 and a filler content in phr of greater than 50, and having: a tan(δ)max/(G*25%) ratio at most of 0.065, in which tan(δ) is the measurement, at 60° C., of the loss factor of the tread material, and G*25% is the complex dynamic shear modulus, expressed in MPa, and a deformation at break under tensile testing at least equal to 530%, at a temperature of 60° C.

Tire comprising a tread (1) having sipes (5) having a non-zero inclination with a plane perpendicular to the tread surface (10). The tread is an elastomer compound based on natural rubber or synthetic polyisoprene with a majority of cis-1,4 linkages, the natural rubber or the synthetic polyisoprene in case of a blend being present in a majority amount relative to the amount of the other diene elastomer(s) used and on a reinforcing filler consisting predominantly of silica, with a content expressed in phr (parts by weight per hundred rubber) of greater than 40 and an overall filler content expressed in phr of greater than 50, this material having a tan(δ)max/(G*25%) ratio at most equal to 0.065, in which tan(δ)max is the measurement, at 60° C., of the loss factor of the material of which the tread is made, and G*25% is the complex dynamic shear modulus, expressed in MPa, of this material, and a deformation at break which is at least equal to 530%, this value being obtained at a temperature of 60° C.

A pneumatic tire includes: a rib defined by a circumferential main groove; circumferential sipes formed in the rib at intervals in the circumferential direction; rib edge sipes formed in the rib aligning in the circumferential direction, each of the rib edge sipes terminating in the rib opening to the circumferential main groove; and first and second narrow grooves extending in the circumferential direction, each of the first and second narrow grooves having a groove depth shallower than depths of the circumferential sipes and the rib edge sipes, the first narrow grooves having ends connected to one of the circumferential sipes adjacent to each other in the circumferential direction and the second narrow grooves each including an inner connecting portion connected to one of the first narrow shallow grooves and including an outer connecting portion connected to one of the rib edge sipes.

Mould for moulding a tread of a tire, this tread having a thickness of material to be worn away and a tread surface intended to come into contact with the road surface when the tire is running, this mould having a moulding surface intended to mould the tread surface of the tread, and having a moulding element formed of a blade and a bar, the blade being attached to the moulding surface to mould a sipe in the tread, the bar, borne by the blade to form an enlarged part of maximum width D, being intended to mould a channel in the tread, this channel itself being intended to form a new groove when the tread becomes part worn. Each blade is delimited by two lateral faces forming between them a mean angle of between 6° degrees and 18°. The blade width decreasing from the mould surface when new, as far as the connection with the bar, the blade width meets the bar being at least equal to between 0.2 and 0.4 times the maximum width D.

The present invention provides for a truck tire tread (2) that has a shoulder area having a lateral sipe (23). The lateral sipe (23) has an average sipe line oriented at an average sipe angle greater than 20 degrees in absolute value oriented to the lateral direction (Y) running inboard to outboard. The lateral sipe (23) is also inclined such that a sipe inclination line miming from a sipe bottom point (31) to a sipe top point (32) in a reference plane perpendicular to the average sipe line is at a sipe inclination angle (35) from 10 to 50 degrees to a reference line oriented only in a thickness direction (Z) of the tread. The lateral sipe is inclined such that the sipe bottom point is configured to approach a contact patch before the sipe top point.

By forming a ground contact edge side of lug grooves such that the groove depth becomes shallower in groove depth from the tire equatorial plane side toward the ground contact edge, and by setting an average angle of inclination formed between a tread face and a groove bottom to be not more than 5°, water expulsion is performed smoothly in the vicinity of the ground contact edge while securing the rigidity of land portions in the vicinity of the ground contact edge. This enables a high degree of both wet performance and dry performance to be achieved.

A tire that includes a tread 4 having a plurality of land portions demarcated by circumferential grooves. Sipes are formed in at least one of the land portions to form a plurality of rods each surrounded by the sipes. Each rod has a bent portion between an outer surface of the rod and a root thereof. Each rod is bent so as to form an arc at the bent portion or each rod is bent so as to form a corner at the bent portion.