Taking a groove side-wall to a position at a groove depth from a tread face of lug groove as a tread-in side first inclined portion, and taking a groove side-wall from the position at groove depth to a groove bottom as a tread-in side second inclined portion, then the following A1 is set less than the following B1. When viewed in cross-section orthogonal to a length direction of the lug groove: A1 is an area of a region enclosed by an imaginary line passing through an end portion on a tread face side of the tread-in side first inclined portion and perpendicular to the tread face, by an imaginary line passing through an end portion on a groove bottom side of the tread-in side first inclined portion and orthogonal to the imaginary line, and by the tread-in side first inclined portion; and B1 is an area of a region enclosed by an imaginary line passing through an end portion on a tread face side of the tread-in side second inclined portion and perpendicular to the tread face, by an imaginary line passing through the deepest portion of the lug groove and parallel to the tread face, and by the tread-in side second inclined portion.

A tire mold comprising a tread mold portion divided into mold segments having transverse edges which are movable between (i) an opened position, wherein the mold segments are spaced apart, and (ii) a closed position, wherein neighboring mold segments are in contact with each other, each of the mold segments comprising blades; wherein at least a first one of the mold segments has laterally extending blades located at a first transverse edge, wherein at least a second neighboring one of the mold segments has laterally extending blades located at a second transverse edge adjacent to the first transverse edge of the first one of said the mold segments, and when in the closed position said the laterally extending blades of the first one of the mold segments interlock between the laterally extending blades of the second one of said the mold segments.

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.

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.

Embodiments of the disclosure include a tire tread having tread blocks (24) each defined by a pair of lateral grooves (20) each being asymmetric whereby a first portion (26) of a trailing side (TS24) the tread block is inclined and extends to a peak (28), and whereby a recess (38) projects into tread block below the first portion. Each tread block also includes a sipe (22) extending into the tread thickness from the outer, ground-engaging side of the tread, where the sipe is generally inclined relative to the direction of the tread thickness, such that as the sipe extends into the tread thickness from the outer, ground-engaging side, the sipe extends towards the trailing side (TS24) of the corresponding tread block, the sipe including a groove (40) arranged along the sipe within the tread thickness and spaced below the outer, ground-engaging side of the tread. The groove being asymmetric relative to a centerline (CL22) of the sipe.

Tyre for a heavy-duty vehicle, this tyre comprising a tread (1) having a thickness E of wearable material and a tread surface (10) intended to come into contact with a roadway, this tread (1) having, on at least one raised element, a plurality of inclined sipes (5) extending into the thickness of the tread, these inclined sipes (5) having suitable widths such that they close up at least partially when they enter the contact patch in contact with the roadway. The tire being formed from a material having, a tan()max/(G*25%) ratio is at most equal to 0.065, in which tan()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, anda deformation at break under tensile testing which is at least equal to 530%, this value being obtained at a temperature of 60 C.

The pneumatic tire includes, on a tread surface, at least two circumferential main grooves and at least one rib-like land portion defined by two of the circumferential main grooves. The rib-like land portion includes neither grooves nor sipes that extend to include a widthwise center line of the rib-like land portion. The rib-like land portion includes a one-end-open sipe and a both-end-closed sipe. The one-end-open sipe has a widthwise sipe portion and a circumferential sipe portion, the widthwise sipe portion extending in tire width direction from one end of the one-end-open sipe and being terminated within the rib-like land portion, and the circumferential sipe portion being located closer to the widthwise center line than the both-end-closed sipe, extending in tire circumferential direction from the widthwise sipe portion, and being terminated at another end of the one-end-open sipe.

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.

A heavy truck tire is provided that includes a casing with a central axis, and a rubber tread that has a first layer and a second layer. The first layer is located farther from the central axis in a radial direction than the second layer. The first layer has a lower max tan() than a max tan() of the second layer. The max tan() of the first layer is from 0.06-0.15, and the max tan() of the second layer is from 0.12-0.27. The tire also has a sculptural feature that reduces irregular wear.

A tire tread includes a middle rib formed by two circumferential main grooves extending along a tire circumferential direction, a first shoulder rib disposed axially outward from the center rib and one of the circumferential main grooves, and a second shoulder rib disposed axially outward from the center rib and the other of the two circumferential main grooves. The middle rib has a plurality of sipes inclined oppositely with respect to a tire rotational direction such that the sipes extend farther away from a rotational axis of the tire tread as the sipes extend in the tire rotational direction. The middle rib thereby defines a row of circumferentially extending tread elements having chamfers at trailing edges of the tread elements.