Abstract: A pneumatic tire includes, on a tread surface, circumferential main grooves extending in a tread circumferential direction, and land portions defined between circumferential main grooves adjacent in a tread width direction among the circumferential main grooves, or by a circumferential main groove and a tread edge. The land portions include widthwise grooves (and/or widthwise sipes), extending in the tread width direction, each including a gradually decreasing groove (sipe) width portion in which a groove (sipe) width gradually decreases from the tread surface towards an inner side in the tire radial direction, a constant groove (sipe) width portion that extends from the gradually decreasing groove (sipe) width portion towards the inner side in the tire radial direction and has a constant groove (sipe) width, and a branched groove (sipe) portion branching and extending from the constant groove (sipe) width portion towards the inner side in the tire radial direction.

Abstract: A tread for a tire includes a first circumferential main groove, a second circumferential main groove, a third circumferential main groove, and a fourth circumferential main groove. The fourth main groove has a stabilizing structure for increasing tread stiffness. The stabilizing structure has a circumferentially extending subgroove in a radially innermost bottom of the fourth circumferential main groove. The subgroove is axially offset a predetermined amount from a centerline of the fourth circumferential main groove.

Abstract: A tyre includes a tread portion provided with a circumferential groove and a lateral groove. The at least one lateral groove includes a connected portion connected to the circumferential groove. The circumferential groove includes a groove bottom provided with groove bottom protruding portions protruding outwardly in the tyre radial direction. Each groove bottom protruding portion includes a first surface portion extending in the tyre radial direction and facing a first circumferential direction, and a second surface portion arranged on a second circumferential direction opposite to the first circumferential direction and extending at a larger angle with respect to the tyre radial direction than that of the first surface portion. In a tread plan view, at least a part of the groove bottom protruding portions is located in a lateral-groove extended region in which the connected portion is extended into the circumferential groove along the tyre axial direction.

Abstract: The molding element has a plurality of contacting element delimited by grooves, the molding element having a molding surface for forming a contact face of the contacting element intended to come into contact with ground during rolling and a groove forming rib portion for forming the groove comprising two opposed rib side faces for forming two opposed groove side faces and a rib top face connecting two rib side faces for forming a groove bottom, the groove forming rib portion providing a space opening to at least one of the rib side faces and/or to the rib top face and an insert being received in the space for forming a portion of the groove and a closing device in the groove, the insert comprises at least one notched plate of thickness t1, the notched plate includes at least one notch for forming a flexible fence of the closing device.

Abstract: A pneumatic tire includes: a lateral groove that includes a groove bottom surface extending in a direction crossing a tire circumferential direction; and a protrusion provided on the groove bottom surface and extending in an extension direction of the groove bottom surface. The protrusion includes: a main body; and a raised portion provided at least at one end portion on one side in a longitudinal direction of the main body, and shaped such that a height of the raised portion from the groove bottom surface increases from an outside to an inside in the longitudinal direction of the main body. The raised portion has at least one vent mark that is a mark of a vent of a tire vulcanization mold.

Abstract: Tyre (1) for heavy load vehicle wheels, having a tread band (8) comprising: —a plurality of circumferential grooves (3, 4, 5, 6); —a plurality of transverse grooves (15) extending between two axially consecutive circumferential grooves (3, 4, 5, 6), thus defining a plurality of blocks (21); —each block (21) comprising a radially outer top surface (7) and having a height (M) measured between said top surface and a bottom surface of a respective transverse groove (15); —said transverse grooves (15) comprising a first segment (16) having a width L1 and a second segment (17) having a width L2, where L2<L1; —said first segment (16) being at least partially delimited by walls of two circumferentially consecutive blocks (20, 21); —at least one filling element (18) contained within said first segment (16); —said at least one filling element (18) having a radially outer top surface (19), located radially inwardly relative to said top surface (7) of the block at a radial distance (D) between 5% and 50% of the height

Abstract: A tread pattern of a heavy duty pneumatic tire includes: a linear shaped center lug groove; a pair of circumferential main grooves formed in a wave shape in a tire circumferential direction; a center block; and a central narrow groove that does not have a linear shape, having an opening end that opens in the adjacent center lug grooves in a tire lateral direction position excluding on a tire equator line, and having a groove width that is narrower than the groove width of the shoulder lug groove. The groove width of the center lug groove and the circumferential main groove is narrower than the groove width of the shoulder lug groove. The central narrow groove has a portion that extends outwards in a tire lateral direction from the opening end in the half tread region where the opening end is positioned.

Abstract: A tread (10) for a heavy truck tire having a groove (14) with a bottom (16) and a stone ejector (18) located within the groove (14) that extends upwards from the groove bottom (16) wherein the stone ejector (18) has a front side (20), a back side (22) and an upper surface (24) that extends at different distances upwards at different locations on the upper surface (24) such that a first location (26) on the upper surface (24) is located closer to the back side (22) and extends a longer distance upwards than a second location (28) on the upper surface (24) that is located closer to the front side (20).

Abstract: Tread (1) of a tire for an off-road vehicle, with total width (W) and total thickness of wearable material at least equal to 60 mm. The tread is delimited axially by shoulder regions (5) provided with grooves (7). This tread (1) comprises, in central region (6), narrow groove (61) and, between each shoulder region (5) and the central region (6), an intermediate region (4) in which there are formed a plurality of oblique or transverse narrow grooves (411, 412). Narrow groove (61) of the central part is made up of first narrow-groove parts (611) of depth (P1) and of second narrow-groove parts (612) of depth (P2). Depth (P1) is greater than depth (P2). Narrow grooves (411, 412) of one same intermediate region comprise, in the circumferential direction, an alternation of narrow grooves (411) of first depth (P11) and of narrow grooves (412) of second depth (P22).

Abstract: A pneumatic vehicle tire with a tread comprising circumferential grooves (2) and at least one profile rib (1), which runs around in the circumferential direction and formed in which there are grooves (4) which at a groove flank (5) of a circumferential groove (2) that delimits the profile rib (1) open into it, wherein the groove flanks (5) of the circumferential groove (2) run at an angle (?) of 12° to 17° to the radial direction, thereby widening the circumferential groove (2) in the direction of the periphery of the tread. The grooves (4) run at an angle (?) of 45°±20° to the axial direction, end within the profile rib (1), have a maximum depth (t2) of 3.5 mm and open in each case into a local indentation (7), which is formed at the groove flank (5), reaches up to the periphery of the tread, is concavely rounded along the groove flank (5) and has a bottom (7a) that runs in particular parallel to the periphery of the tread and is at a distance (c), determined in the radial direction, of 0.5 mm to 2.

Abstract: A tire comprises a tread portion having a tire equator C and a first tread edge Te1. The tread portion is provided with a first main groove extending continuously in the tire circumferential direction and a first land region. The first main groove is provided on its axially outer groove wall with recessed portions recessed axially outwardly and arranged in the tire circumferential direction. The first land region is provided with first lateral grooves each comprising a first portion connected with the first main groove to form an opening and a second portion having a groove width smaller than the first portion and disposed axially inside thereof. At least a part of the opening of at least one of the first lateral grooves faces one of the recessed portions in the tire axial direction.

Abstract: A first tire includes a tread having a circumferential center rib and a circumferential intermediate rib laterally adjacent the center rib, the intermediate rib being separated from the center rib by a first circumferential groove, a second circumferential rib bordering the intermediate rib opposite the first circumferential groove, the tread further including two other circumferential grooves; at least one stiffener element disposed within each of the four circumferential grooves, the stiffener elements having a reduced height relative to a height of the center and intermediate ribs; and the stiffener element having a circumferentially oriented cut extending into an upper surface of the stiffener element toward a bottom of the stiffener element, the cut extending circumferentially through the stiffener element with the cut bounded by opposite laterally inward facing cut sides.

Abstract: Various embodiments of a tire tread having one or more flexible gate apparatuses are disclosed. In one embodiment, a tire having a tread is provided, the tire comprising: a groove comprising a groove base and at least one groove sidewall; at least one flexible gate apparatus comprising a plurality of adjacent flexible gate elements oriented in a single row across at least a portion of the groove; wherein the plurality of flexible gate elements extend from the groove base; wherein the at least one flexible gate apparatus comprises a rigidity such that the at least one flexible gate apparatus does not substantially deflect at the application of an air pressure during operation; and wherein the at least one flexible gate apparatus comprises a rigidity such that the at least one flexible gate apparatus deflects at the application of a water pressure during operation.

Abstract: A pneumatic tire comprising on a tread surface 1 a plurality of blocks 7, wherein: the blocks have an inclined groove 43 formed thereon; the inclined groove has a connecting portion 43a connected to the circumferential main grooves, a wide-width portion 43b connected to the connecting portion, and a narrow-width portion 43c connected to the wide-width portion; the wide-width portion and the narrow-width portion have inclination angles with respect to the tire circumferential direction smaller than the connecting portion; the blocks have a sipe 52a formed thereon, the sipe having one end opening to the connecting portion and the other end opening to the circumferential main grooves; and the sipe has a bent portion.

Abstract: Blocks are formed on a tread surface of a pneumatic tire by main grooves extending in the tire circumferential direction and lateral grooves which intersect with the main grooves. The blocks include: center blocks which are positioned in a center region in the tire width direction; shoulder blocks which are positioned on both side regions in the tire width direction; and mediate blocks which are positioned in an intermediate region between the center blocks and the shoulder blocks. The lateral groove formed between the shoulder blocks and the lateral groove formed between the mediate blocks which are positionally displaced from each other in the tire circumferential direction are connected to each other via the main groove by an auxiliary block.

Abstract: A pneumatic tire has a main groove (3) provided to a tread part (2). A groove bottom (12) includes a protrusion portion (13) that is convex outward in a tire radial direction. The protrusion portion (13) continues along the main groove (3). The width (W3) of the protrusion portion (13) in a direction perpendicular to a groove center line (G1) of the main groove (3) is 50% to 100% of the groove width (W1) of the main groove (3). The protrusion portion (13) juts outward in the tire radial direction from an imaginary groove bottom (12A) that connects an inner end (10i) of a first groove wall (10) and an inner end (11i) of a second groove wall (11) in a straight line, and the cross-sectional area of the protrusion portion (13) is 3% to 15% of the transverse cross-sectional area of the main groove (3).

Abstract: Blocks are formed on a tread surface of a pneumatic tire by main grooves extending in the tire circumferential direction and lateral grooves which intersect with the main grooves. A size of the block in the tire width direction of the tread surface is set larger than a size of the block in the tire circumferential direction of the tread surface. The blocks include: center blocks which are positioned in a center region in the tire width direction; shoulder blocks which are positioned on both side regions in the tire width direction; and mediate blocks which are positioned in an intermediate region between the center blocks and the shoulder blocks. A recessed portion is formed on an approximately center portions of the shoulder blocks and the mediate blocks excluding the center blocks.

Abstract: A pneumatic tire includes a tread portion with an unsymmetrical tread pattern that includes a circumferentially extending first main groove at a nearest side of an inboard tread edge, a circumferentially extending second main groove adjacent to the first main groove, and a middle land portion arranged therebetween. The middle land portion is provided with a plurality of inclined grooves, a plurality of inboard middle lateral grooves including one end communicated with the first main groove and the other end communicated with the inclined groove, and a plurality of outboard middle lateral grooves including one end communicated with the second main groove and the other end communicated with the inclined groove. Respective groove center points of the inboard middle lateral grooves are arranged in different places in the circumferential direction of the tire from respective groove center points of the outboard middle lateral grooves.

Abstract: A pneumatic tire comprises a tread portion provided with a center main groove on the tire equator and a shoulder main groove on each side of the center main groove. The center main groove and the shoulder main groove extend zigzag and continuously in the tire circumferential direction so that a crown land portion defined between the center main groove and the shoulder main groove has an axial width alternately increasing and decreasing along the tire circumferential direction. The crown land portion is provided with a shallow crown circumferential groove extending zigzag and continuously in the tire circumferential direction, and crown sipes extending from the center main groove to the shoulder main groove across the shallow crown circumferential groove. Zigzag apexes of the shallow crown circumferential groove are respectively positioned between the crown sipes.

Abstract: A tread profile has a tread profile section which is in the center of the tire in the axial direction, and in each case one shoulder profile section. The central tread profile section is composed of profile belts, and the shoulder profile sections each have a second profile belt. A circumferential groove is arranged in each case between a first profile belt of the central section and the profile belt of the shoulder section. The groove is formed with a web which is radially raised from the groove base and which divides the groove into a narrow first and a wider second section which has, at the groove base, a linear section of extent which merges, with a curvature radius R3 and R2, with the edges of the profile belt or of the web, wherein R3>R2. The linear section of extent is at an angle of inclination >0°.

Abstract: A tire may include a tire body having an annular groove formed in a tread surface of the tire body. A plurality of spaced-apart studs may be located within the groove.

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition and has a tread portion, in which is formed at least one primary groove of depth D and width W having a base surface and two opposing walls, and multiple flexible fences of thickness E, which extend inside the primary groove such that at least 70% of the cross-sectional area of the primary groove is blocked and which are disposed at intervals such that at least one of the multiple flexible fences is in the primary groove in the tread contact patch when the tire is rolling, wherein the multiple flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; and the rubber composition for fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tre

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition, and has a tread portion in which a primary groove is formed and multiple flexible fences is formed in the primary groove; the flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition for fences of the flexible fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a reinforcing filler selected from the group consisting of carbon black, inorganic fillers, organic fillers, and mixtures of said fillers, which has a BET specific surface area of less than 100 m2/g and is in an amount of betwee

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition, and has a tread portion in which at least one primary groove is formed and multiple flexible fences is formed in the primary groove; the flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition for fences of the flexible fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a reinforcing filler which is less than 50 phr; (c) a plasticizing system, and (d) a vulcanizing system.

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition, and has a tread portion in which a primary groove is formed and multiple flexible fences is formed in the primary groove; the flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition for fences of the flexible fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a filler A, which is more than 50 phr of filler A in which the filler particles are nanoparticles having an average grain size (by weight average) smaller than 500 nm; and (c) a filler B, which is more than 50 phr of filler B in

Abstract: A tire 1 comprises rib-shaped land portions 20 extending in a tire circumferential direction TC and has a circumferential groove 30 adjacent to the land portions 20 and extending in the tire circumferential direction TC. Tread contact surfaces 10 of the land portions 20 form smooth surfaces with no gap when a normal load is applied and the tread contact surfaces are in contact with a road surface. The circumferential groove 30 includes a shallow groove portion 40 extending in the tread-width direction TW, and a deep groove portion 50 adjacent to the shallow groove portion 40 in the tire circumferential direction and extending in the tread-width direction. A deep groove portion 50 is recessed more inwardly in a tire radial direction TR than the shallow groove portion 40 with a groove bottom 40c of the shallow groove portion 40 being an upper end of the deep groove portion 50.

Abstract: Bare can be prevented from occurring in a wear indicator. A pneumatic tire has a wear indicator 5 at the groove bottom of a main groove 2 formed in a tread surface 1 and extending in the circumferential direction. The wear indicator 5 is formed in the surface thereof with at least one recess 6.

Abstract: A pneumatic tire capable of improving snowy road performance while controlling the occurrence of uneven wear of the tire due to buckling deformation. A tire 10 having a block pattern is provided with raised bottom portions 19 in lug grooves 15 extending in a direction intersecting with a main groove 13 and shoulder grooves 12, 14. The raised bottom portion 19 crosses the shoulder groove defining the center blocks 16 and shoulder blocks 17. The height of the raised bottom portion 19 is in a range of 10 to 20 percent of the groove depth of the shoulder groove. As a result, the edge components in the circumferential direction of the tire are increased and the rigidity in the axial direction of the tread 11 is uniformized without causing a decline in the draining characteristics.

Abstract: A pneumatic tire is provided with a large number of holes that are arranged in the tire's circumferential direction. These holes are provided in land portions that are provided in both shoulder sections of a tread. The land portions can have different pitch lengths. Each of the holes has formed there inside a projection having an upper end with a flat surface or a convex surface. The distance between the outer wall of the projection at the upper end thereof and the inner wall of the hole is set in the range from 1 to 5 mm. The upper end of the projection is located at a position below the opening of the hole.

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition, and has a tread portion in which a primary groove is formed and multiple flexible fences is formed in the primary groove; the flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition for fences of the flexible fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a filler A, which is more than 50 phr of filler A in which the filler particles are nanoparticles having an average grain size (by weight average) smaller than 500 nm; and (c) a filler B, which is more than 50 phr of filler B in

Abstract: Article (1) having at least one visible surface (11), this surface comprising on at least part of it a pattern (2) contrasting with the surface of the article, this pattern (2) comprising a plurality of tufts (21) distributed over the entire said pattern, each tuft (21) having an average cross section between 0.003 and 0.06 mm2. Also disclosed is a moulding process for forming a high-contrast pattern on a surface of an article that can be moulded in a mould, this process consisting in producing, at the position of the pattern on the surface of the mould, a plurality of cavities of average cross section between 0.003 and 0.06 mm2.

Abstract: In a tire 1, a central land portion row 20C and intermediate land portion rows 20M are formed by center-side main grooves 10C. A projecting portion 50 projecting outwardly in a tire radial direction TR from a groove bottom surface 11 of the center-side main groove 10C is provided in the central groove 10C. The projecting portion 50 is located on an extension line L1 extending in an extending direction of lug grooves 30M, and extends outwardly in the tread width direction TW from a sidewall 21 of the central land portion row 20C. An inner end height H1 of the projecting portion 50 located on an innermost side thereof in the tread width direction TW and continuous to the central land portion row 20C is greater than an outer end height H2 of the projecting portion 50 located on an outermost side thereof in the tread width direction TW.

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition, and has a tread portion in which at least one primary groove is formed and multiple flexible fences is formed in the primary groove; the flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition for fences of the flexible fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a reinforcing filler which is less than 50 phr; (c) a plasticizing system, and (d) a vulcanizing system.

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition, and has a tread portion in which a primary groove is formed and multiple flexible fences is formed in the primary groove; the flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; the rubber composition for fences of the flexible fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tread portion; and the rubber composition for fences comprises a filler composition that is based on (a) a diene elastomer, (b) a reinforcing filler selected from the group consisting of carbon black, inorganic fillers, organic fillers, and mixtures of said fillers, which has a BET specific surface area of less than 100 m2/g and is in an amount of betwee

Abstract: A pneumatic tire tread capable of mitigating air column resonance and maintaining drainage performance while ensuring that the flexible fences are abraded to a similar extent to the tread portion is formed from a rubber composition and has a tread portion, in which is formed at least one primary groove of depth D and width W having a base surface and two opposing walls, and multiple flexible fences of thickness E, which extend inside the primary groove such that at least 70% of the cross-sectional area of the primary groove is blocked and which are disposed at intervals such that at least one of the multiple flexible fences is in the primary groove in the tread contact patch when the tire is rolling, wherein the multiple flexible fences are formed from at least a rubber composition for fences that is different from the rubber composition for the tread portion; and the rubber composition for fences has an abrasion index that is more than or equal to twice the abrasion index of the rubber composition of the tre

Abstract: A tread profile has a tread profile section which is in the center of the tire in the axial direction, and in each case one shoulder profile section. The central tread profile section is composed of profile belts, and the shoulder profile sections each have a second profile belt. A circumferential groove is arranged in each case between a first profile belt of the central section and the profile belt of the shoulder section. The groove is formed with a web which is radially raised from the groove base and which divides the groove into a narrow first and a wider second section which has, at the groove base, a linear section of extent which merges, with a curvature radius R3 and R2, with the edges of the profile belt or of the web, wherein R3>R2. The linear section of extent is at an angle of inclination >0°.

Abstract: A tire is disclosed having a tread extending from a first tread edge to a second tread edge and having a plurality of blocks defining a plurality of lateral grooves. The lateral grooves have a groove bottom defining a radial groove depth. A first biting side extends outwardly from the groove bottom to a first biting edge, and a first non-biting side extending outwardly from the groove bottom to a first non-biting edge. At least one peak is disposed in at least one of the lateral grooves. The peak extends outwardly from the groove bottom and terminates radially at an outer end and axially at a distance from the equatorial plane less than or equal to one half of the tread width. The peak has a height between 25 percent and 75 percent of the depth of its lateral groove. Multiple peaks may be disposed within a groove.

Abstract: Provided is a pneumatic tire capable of yielding excellent water-draining performance, while reducing air column resonance. This pneumatic tire (1) has a tread (3) and at least one ply (2) arranged toward the interior of the tread in the radial direction. The tread has at least one main channel (4) and a flexible fence (5) formed inside the main channel. The main channel has a bottom (413) and opposing first and second wall surfaces (411, 412). The flexible fence extends along the width of the main channel so as to block at least 70% of a cross sectional area of the main channel, and is arranged at intervals so that at least one is present in the main channel in the tread footprint when the tire rolls. A plurality of recesses having an opening that opens in the main channel are formed on the bottom, first wall surface and/or second wall surface of the main channel, the flexible fence being connected to the recess and extending into the main channel via the opening of the recess.

Abstract: A tread for a pneumatic tire in which air column resonance sound is reduced and wear of the groove fences and tread portion are caused to be approximately the same, while drainage performance is maintained, wherein a plurality of groove fences are formed and are installed within at least one circumferential groove, extending from the bottom of the circumferential groove, and block at least 70% of the cross-sectional area of the circumferential groove, and the bending parameter of the groove fences, defined as E·I/(h3l) (where E is the modulus at 10% elongation of the material used for the groove fences, I is the second moment of area of the groove fence, h is the height of the groove fence, and l is the width of the groove fence) is at least equal to 250 Pa and at most equal to 350 Pa.

Abstract: Noise-reducing device intended to be added to a groove of the tread of a tire comprising an elastic sole preferably extending in a given longitudinal direction, wherein the said sole on one of its faces comprises one or several flexible walls the planes of which run substantially perpendicular to the longitudinal direction of the sole.

Abstract: A tyre includes a tread provided with blocks formed among substantially longitudinal and transverse grooves, wherein among the blocks particularly broad intersections are formed, for example, by staggering substantially transverse grooves of circumferential rows axially in side-by-side relationship, of blocks with rounded corners, and wherein, inside such broad intersections, a stocky-shaped protrusion is arranged which has a lateral stiffness greater than the lateral stiffness of the surrounding blocks.

Abstract: A motorcycle tire comprises a tread portion including a pair of tread edges to define a tread width, and a pair of tread shoulder regions each of which has a 12.5% width region of the tread width from each tread edge, the tread portion provided with a first lateral groove extending from one of the tread shoulder regions to the other one of the tread shoulder regions and a second lateral groove extending from a groove intersection where the first lateral groove and the second lateral groove cross each other, and a protruded portion being provided at least partially in the groove intersection so that a groove depth is reduced.

Abstract: An object of the present invention is to provide a pneumatic tire excellent in running performance on a rough road. In order to achieve the object, a pneumatic tire comprises a tread surface having a plurality of lug grooves each of which opens to a sidewall, the sidewall includes a plurality of protrusions disposed thereon, wherein each of the lug grooves includes a protruding strip portion disposed on a groove bottom of the lug groove and extending along an extending direction of the lug groove, the protruding strip portion has a start point thereof at an inner side than a ground-contact point in a width direction as viewed from a front side thereof, and extends up to one of the protrusions beyond an open end of the lug groove located at the sidewall side and is connected to the protrusion.

Abstract: A tread 1 having a tread surface 3 onto which there opens at least one cavity 2, this cavity being bounded by a cavity wall 20 comprising a bottom wall 21 extended by a side wall 22 intersecting the tread surface to form at least one edge corner 31, this tread being, over at least part of the wall of the cavity 2, provided with a plurality of supporting strands 4, each supporting strand 4 comprising two ends of which one end 41 is attached to the cavity wall 20, this tread being characterized in that the supporting strands 4 each comprise at least one branching formed by the attachment of at least one branching strand 5.

Abstract: A tread strip made of at least one rubber-based material, and having at least one longitudinal groove bounded by a bottom wall and by two lateral walls on opposite sides of the bottom wall; wherein a number of pins seamlessly project from at least one of the walls of the longitudinal groove, and are made of the same rubber-based material than the tread strip.

Abstract: The object of the present invention is to provide a pneumatic tire with an operation life elongated by a countermeasure for stone trapping. Projections 28 for preventing stone trapping are disposed on a groove bottom only of a flexion portion 24 of a center main groove 20 disposed on a tread portion 18 where the main groove bends in a zigzag manner, and an angle of a groove wall of a linear portion 26 connecting the adjacent bending portions with respect to a tread normal line direction is larger than an angle of a groove wall of the flexion portion 24 with respect to the tread normal line direction. This can suppress stone trapping at the same level as the conventional tire without providing a projection for preventing stone trapping on the linear portion 26.

Abstract: A pneumatic tire with improved steering stability without raising air columnar resonance noise level is provided. The pneumatic tire comprises upper thin grooves 11a extending from a branch point 21 in the depth direction of a main groove on the tread surface side and a plurality of lower thin grooves 11b extending from the branch point 21 in the depth direction of the main groove on the groove bottom side, which are formed at intervals along the tire circumferential direction R in a sidewall of the main groove and a distance B from the groove bottom of the main groove 1 to the branch point 21 is 30 to 60% of the depth D of the main groove 1.

Abstract: The present invention provides a pneumatic tire having: a circumferential groove continuously extending in the tire circumferential direction in a ground contact surface of a tread portion; and a resonator provided in a land portion and constituted of a resonance cell portion opened to a ground contact region at a position distanced from the circumferential groove and a siping portion making the resonance cell portion communicate with the circumferential groove, wherein change in a tread pattern as time lapses can be alleviated without scarifying an effect of reducing pipe resonance sounds. Specifically, an opening width of the siping portion at the ground contact surface of the tread portion is designed to change in the longitudinal direction thereof such that the opening with is relatively narrow on the side of the circumferential groove and relatively wide on the side of the resonance cell portion.

Abstract: A pneumatic tire includes on a tread a plurality of circumferential main grooves extending in the tire circumferential direction, and a plurality of land portions formed by being partitioned by the circumferential main grooves. A protrusion is formed on a groove bottom of at least one of the circumferential main grooves. The protrusion continuously extends in a groove-length direction of the circumferential main groove, and a height h1 of the protrusion varies in a wavelike form along the groove-length direction. Moreover, junctions each of which couples the protrusion onto at least one of groove walls of the circumferential main groove are formed on the groove bottom of the circumferential main groove.

Abstract: A retread tire and methods for its manufacture, the retread tire having a precured tread band bonded to a prepared bonding surface of a base portion of the tire. The precured tread band includes a back face bonded to the prepared bonding surface of the base portion of the tire and a tread groove bottom portion that extends below the back face of the tread band. The tread groove bottom portion may optionally include a void portion of the tread groove and may include the bottom wall of the tread groove and/or just the side walls of the bottom portion of the tread groove. Also included may be a base groove formed in the base portion of the tire and open to the prepared bonding surface of the tire, wherein the tread groove bottom of the tread groove is embedded within the base groove.