Abstract: A pneumatic tire includes a tread surface, a plurality of circumferential main grooves formed on the tread surface and extending in a tire circumference direction, a plurality of lug grooves formed on the tread surface and extending in a tire lateral direction, a plurality of blocks defined by the lug grooves on both sides in the tire circumferential direction and by the circumferential main grooves on at least one end in the tire lateral direction, and narrow grooves formed in the blocks. The narrow grooves include a plurality of bent portions as well as a circumferential narrow groove extending in the tire circumference direction and a lateral narrow groove extending in the tire lateral direction. The lateral narrow groove and the circumferential narrow groove are configured so that at least one thereof is provided in a plurality and includes a plurality of intersection points where the one intersects the other.

Abstract: Provided is a pneumatic tire. Center land portions between main grooves extending in a zigzag shape along a circumferential direction on both sides of an equator of a tread portion are defined into repeating units by first shallow grooves that extend along a lateral direction, have both ends communicating with portions other than bent portions of the main grooves, and are disposed at intervals in the circumferential direction. The repeating units are aggregates of four blocks defined by second shallow grooves extending from the main grooves in the lateral direction and converging toward one point on the equator, a third shallow groove extending from one of the first shallow grooves adjacent to the repeating unit to one of the second shallow grooves, and a fourth shallow groove extending from an other of the first shallow grooves adjacent to the repeating units to an other of the second shallow grooves.

Abstract: A pneumatic tire is provided. A tread portion includes shallow grooves formed in a road contact surface of each of shoulder blocks, intermediate blocks, and center blocks, defined by a plurality of longitudinal grooves extending in a tire circumferential direction and a plurality of lateral grooves extending in a tire lateral direction, the shallow groove having a smaller groove depth than the longitudinal groove and the lateral groove. The shallow groove extends along the tire lateral direction, and at least one end thereof communicates with the longitudinal groove or the lateral groove. A contour line of the shallow groove is provided with at least one bend point. A sipe is provided in a flat bottom surface of the shallow groove extending along the shallow groove. Among the shallow grooves, center shallow grooves formed in the center block are each provided with a terminating end portion terminating in the center block.

Abstract: In a pneumatic tire, a sipe includes an edge on a leading side and an edge on a trailing side; the edge and the edge each include a chamfered portion shorter than a sipe length of the sipe; a non-chamfered region in which other chamfered portions are not present is provided at portions facing the chamfered portions of the sipe; and for all chamfered portions, including at least the chamfered portions of the sipe, formed on grooves other than main grooves, with a ground contact width being equally divided into three in the tire lateral direction, a total projected area ACE of chamfered portions provided in a center region centrally located in the tire lateral direction and each of total projected areas ASH of chamfered portions provided in shoulder regions located on either side of the center region satisfy a relationship ACE<ASH.

Abstract: A pneumatic tire that rotates about a center axis includes a tread rubber that comprises a contact patch; a groove provided in the tread rubber, the groove having an inner surface that includes a bottom surface and side surfaces that connect the bottom surface to the contact patch; and a coating film disposed covering at least a portion of the inner surface, the coating film reducing exposure of ultraviolet light to the inner surface.

Abstract: A tire has a tread 5 which includes grooves 7, the side faces 72 of which are undercut, and includes at least one circumferential reinforcing element 8-1 arranged axially relative to said undercut side face 72 at a distance “d” of between 0 and 15% of the axial width L51 of the tread block 51, at least extending radially from the inside towards the outside from a radial level situated above the wear limit level and to a radial height equal to 5% of the thickness “p” of the tread.

Abstract: A method for manufacturing a tread (5) based on uncured rubber material comprises the steps of forming a green form (9) of tread based on uncured rubber material having at least one tread pattern (2) block (3), each tread pattern (2) block (3) having a central portion (11) and at least one lateral portion (12) extending along the central portion (11), of mounting at least one reinforcing ply (7) on at least a part of the central portion (11), and of covering the central part (11) with the aid of the lateral portion (12) in order that the tread pattern (2) block (3) envelops the reinforcing ply (7).

Abstract: Tire tread (1) is divided into central part (20) and edge parts (30), central part (20) having width Lc between 40% and 90% of total width W of the tread. Edge parts (30) do not have any transverse cuts. Central part (20) has a tread pattern with circumferentially oriented sipe (21) and transversely oriented sipes (22, 22?, 22?) distributed around the periphery of the tread, such sipes having a depth at least equal to 60% of thickness E of material to be worn away and being interconnected to form a network. Such sipes are continued by hidden channels (210, 220). Central part (20) is delimited axially by transverse sipes (22?, 22?), each of which ends in end channel (221?, 221?) that opens onto tread surface (10) and extends into the thickness of the tread, and each end channel (221?, 221?) is connected to the network formed by the hidden channels.

Abstract: A tire includes a tread portion provided with a plurality of blocks. At least one of the plurality of blocks is provided with a sipe. The sipe extends in a sipe longitudinal direction to form a zigzag opening configuration on a ground contact surface of the at least one of the plurality of blocks. The sipe extends inwardly in a tire radial direction such that the zigzag opening configuration oscillates in the sipe longitudinal direction repeatedly with a total amplitude and a wavelength while maintaining the zigzag opening configuration. A half of the wavelength of the sipe is in a range of from 0.10 to 0.24 times a maximum depth of the sipe, and a slope of the half of the wavelength with respect to the total amplitude has an angle in a range of from 45 to 65 degrees.

Abstract: Tread for a pneumatic tyre comprising a sipe having a sipe extension (L) and a sipe depth (P) along a direction of wear (U), wherein said sipe has at least two sections (S1, S2) along said direction of wear (U) having respective differentiated conformations, such that an intersection profile (P1, P2) between the sipe and a surface (T1, T2) parallel to the contact surface of the tread is different for each of said at least two sections (S1, S2), wherein at least one surface section (S1) of said at least two sections (S1, S2) has a depth (PS) that is variable along said sipe extension (L), said two sections (S1, S2) being connected by a transition section (S3) defining a transition line (TL) between the respective sections (S1, S2), said variable depth (PS) of said surface section, presenting a maximum depth (PSMAX) and a minimum depth (PSMIN), and wherein the surface section (SI) has a twisted configuration.

Abstract: A tire includes a tread formed with: circumferential grooves extending continuously in a tire circumferential direction; lateral grooves connecting the circumferential grooves in a tire axial direction; and blocks divided by the circumferential grooves and the lateral grooves. In the lateral groove, a groove bottom is raised to form a tie bar connecting the blocks in the tire circumferential direction. The tie bar is formed with a groove portion penetrating the tie bar in the tire axial direction. In a state where the tire is assembled to a regular rim, filled with a regular internal pressure, loaded with a regular load, and contacting a flat surface at a camber angle 0°, a side wall formed on the tie bar by the groove portion on one side in the tire circumferential direction does not contact a side wall on the other side in the tire circumferential direction.

Abstract: 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.

Abstract: In a tread portion of a pneumatic tire, a first sipe wall surface of a sipe includes at least two first peak portions and at least one first valley portion at each position of the sipe extension direction, which are bent in a wave-like shape to form surface recesses and protrusions along a sipe depth direction. The first valley portion is sandwiched between the two first peak portions in the sipe depth direction, and extends from one end of the sipe in the extension direction to the other end of the sipe in the extension direction. A recess depth of the first valley portion with respect to the two first peak portions gradually reduces. A position of at least one of the two first peak portions in the sipe depth direction and a position of the first valley portion in the sipe depth direction become gradually closer.

Abstract: The tread has a contact face which is provided with a plurality of grooves opening to the contact face and a plurality of contact elements being delimited by the plurality of grooves. Each contact element has a top face constituting a part of the contact face and at least two incisions opening to the top face and extending radially inward of the contact elements. The incisions include at least one thin incision that is delimited via two opposed thin incision faces having a width t1 and at least one thick incision being delimited via two opposed thick incision faces having a width t2. The width t2 is thicker than the width t1. The at least one thick incision comprises at least one protrusion protruding from one of the thick incision face toward another thick incision face. The width t2 of the at least one thick incision is at least equal to 1.0 mm.

Abstract: Disclosed is a tire stud comprising a stainless steel body with a flange and a blind hole and further comprising a spike installed in said hole, wherein the cross-sectional shape of the hole is different from the cross-sectional shape of the spike at least at one of: the opening, the lower surface of the spike, and a depth between the opening lower surface of the spike; whereby only protrusions of the spike are attached to the side wall of the hole with friction joints where the cross-sectional shape of the hole is different from the cross-sectional shape of the spike.

Abstract: A ground contact region of the tread portion of a studdable tire includes a center region located over a range corresponding to a length of 5 to 25% of a ground contact width from a tire centerline on each of both sides of the tire centerline in a tire width direction; and two shoulder regions located on both sides of the center region in the tire width direction. In each of the center region and the shoulder regions, a plurality of the stud pin installation holes are disposed along each of four or more pin arrangement lines extending in a tire circumferential direction. An average value of adjacent intervals between the pin arrangement lines in the center region is larger than an average value of adjacent intervals between the pin arrangement lines in each of the shoulder regions.

Abstract: An airless flexible tire including traction lug pairs each having a forward facing traction lug and a rearward facing traction lug cooperatively forming a divided Z or reverse divided Z shape. Each traction lug includes a lateral section and a central section. The central section extends from an end of the lateral section so as to straddle a centerline of the airless flexible tire and includes a number of discrete sidewalls. The discrete sidewalls are different sizes and angled relative to each other. The central sections of paired traction lugs form a space dividing portions of the Z or reverse Z shape. The central sections of nearest traction lugs of adjacent traction lug pairs form a space dividing the adjacent traction lug pairs.

Abstract: A stud pin includes a tip, a body portion, and a lower flange. A flange profile shape of the lower flange is an anisotropic shape includes short sides and long sides of different lengths, and includes four or more first flange protrusion portions that project in the longitudinal direction parallel with the long sides and two second flange protrusion portions that project in the lateral direction parallel with the short sides. A body profile shape of the body portion is a shape including body linear portions extending in a linear manner. The body linear portions are disposed facing a portion of the flange profile shape between two adjacent protrusion portions of the first flange protrusion portion and the second flange protrusion portion along the outer circumference of the flange profile shape.

Abstract: In a pneumatic tire, a sipe includes an edge on a leading side and an edge on a trailing side; the edge on the leading side and the edge on the trailing side each include a chamfered portion shorter than a sipe length of the sipe; a non-chamfered region in which other chamfered portions are not present is provided at portions facing the chamfered portions of the sipe; a maximum depth of the chamfered portion is less than a maximum depth of the sipe; a sipe width of the sipe is constant in a range from an end portion located on an inner side in a tire radial direction of the chamfered portion to a groove bottom of the sipe; and a raised bottom portion is disposed in at least one section of the chamfered portion.

Abstract: A tire, the tread of which has an underlayer and a circumferential reinforcement made up of a rubber mixture with a stiffness greater than the stiffness of the rubber mixture and the underlayer, has an outer side and an inner side. The circumferential reinforcement has a reinforcing element of tapered shape positioned in the tread pattern elements disposed axially on the outside with respect to the first or the second circumferential grooves of the tread from the outside to the inside and axially close to the circumferential groove.