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: Tire tread band having a tread surface having at least two wearing layers, a first wearing layer formed by raised elements each having a contact surface, having at least grooves of circumferential orientation, and intended to contact the road surface when new, and at least one wearing layer in contact with the road surface after the first layer has entirely worn away, and containing at least one channel extending in the circumferential direction, and opening onto the tread surface when the wearing layer that precedes it has completely worn away, each wearing layer distinct from the first wearing layer, having transverse incisions distributed in the circumferential direction, extending from a channel of the layer in a direction which is not circumferential, opening fully or partially into at least one other circumferentially oriented channel or groove, irrespective of the level of wear of the other wearing layer.

Abstract: Pneumatic tire tread which reduces tread pattern noise while suppressing air column resonance from circumferential grooves is provided with a number of sets of resonators and at least two types of branch groove shapes; the length of the first branch grooves at least 40% of the length of the contact surface, and groove width between 10% and 25% of the circumferential groove width; the length of the second branch grooves between 40% and 90% of the length of the first branch grooves, and the groove width no less than the first branch groove width; first openings and second openings alternately present on same circumferential groove; length between openings in first branch grooves is no more than 50% of the length of the contact surface; difference between the minimum cross-sectional void ratio in the ribs where the branch grooves are provided and the maximum cross-sectional void ratio is no greater than 10%.

Abstract: The present invention provides a tire in which generation of partial wear and groove cracks are suppressed.

Abstract: In a pneumatic tire, at least one groove wall face of at least one of the grooves includes a portion located at the tread surface side and a portion located at a groove bottom side with respect to the portion located at the tread surface side, the portion located at the tread surface side includes a plane face that forms a right angle or an obtuse angle with respect to the land portion surface, and a bottom face extending outward in a width direction of the groove from an end at the groove bottom side of the plane face, the portion located at the groove bottom side has an inclined face extending from the groove bottom in the width direction toward the outside of the bottom face, the inclined face and the bottom face form therebetween a recess portion recessed outward in the width direction of the groove.

Abstract: A tire for a motor vehicle includes a tread and two shoulders. The tread includes a first circumferential row of blocks disposed between first and second circumferential grooves. Each of the blocks is delimited by a section of the first circumferential groove and by first and second transverse grooves that extend from the first circumferential groove and terminate at a first common vertex spaced from the second circumferential groove. The tread further includes a second circumferential row of blocks disposed between the second circumferential groove and a third circumferential groove. Each of the blocks of the second circumferential row of blocks is delimited by a section of the second circumferential groove and by third and fourth transverse grooves that extend from the second circumferential groove and converge and terminate at a second common vertex. The first common vertex is separated from the second circumferential groove by a circumferential tread rib.

Abstract: A pneumatic tire 1 having excellent on-snow performances improved with maintaining steering stability and uneven wear resistance and including tread portion 2 having a pair of crown circumferential grooves 3 which extend continuously in the tire circumferential direction on both sides of tire equator C and have groove edges, one edge 3m extending in such a zigzag form that italic L-shaped groove edge segments 3s are continuously connected to each other in the circumferential direction, and the other edge 3n extending in such a wavy form that circular arc groove edge segments 3o each having a circular arc shape convex toward a groove center are continuously connected to each other in the circumferential direction, wherein each of the italic L-shaped groove edge segments 3s comprises long side part 3c inclined at an angle of 1 to 20° with respect to the circumferential direction, and short side part 3t having a circumferential length smaller than that of the long side part 3c and inclined in the opposite direct

Abstract: A heavy duty tire comprises a tread portion provided with a center rib, shoulder ribs and middle ribs therebetween. The middle ribs are provided with closed-end sipes. The sipe comprises: an axially inner segment and axially outer segment inclined at an angle of from 30 to 60 degrees with respect to the tire circumferential direction; and a middle segment therebetween inclined in a direction crosswise to the axially inner and outer segments. The angle ?1 between the axially inner segment and middle segment is from 90 to 110 degrees. The angle ?2 between the axially outer segment and middle segment is from 90 to 110 degrees. The axial length SW of the closed-end sipe measured from the axially inner end to the axially outer end thereof is from 0.50 to 0.90 times the axial width LW of the middle rib.

Abstract: A pneumatic tire (10) provided with a rib-like land portion (110) having first resonators formed therein, and also with a rib-like land portion (210) located, when the tire is mounted on a vehicle, on the side of the tire closer to the vehicle than the rib-like land portion (110) and having second resonators formed therein. Each of the first and second resonators includes an air chamber recessed inward in the radial direction of the tire, and also includes a narrow groove communicating with the air chamber and a circumferential groove. The volume of the air chamber of the first resonator is greater than the volume of the air chamber of the second resonator.

Abstract: A radial tire for a handling vehicle, comprising a tread in which the thickness in the radial direction in the circumferential mid-plane is greater than 40 mm. The tire comprises at least three circumferential grooves, at least the central circumferential groove having an axial width L of less than 15 mm and a radial depth H which are such that the ratio of axial width L to radial depth H is between 0.1 and 0.3.

Abstract: A tire tread includes a circumferential row of blocks disposed between first and second circumferential grooves, wherein each of the blocks is delimited by a section of the first circumferential groove and by first and second transverse grooves that extend from the first circumferential groove and terminate at a common vertex spaced from the second circumferential groove. The common vertex is separated from the second circumferential groove by a continuous circumferential tread rib. The second transverse groove delimits a first one of the blocks and is separated from the first transverse groove that delimits a circumferentially adjacent block by a solid tread portion. The solid tread portion extends from the first circumferential groove to the continuous circumferential tread rib, and the solid tread portion forms a single body with the continuous circumferential tread rib, spacing the first block and the circumferentially adjacent block from each other.

Abstract: A pneumatic tire has a tread pattern which comprises at least three circumferential grooves with a groove width of 6 to 18 mm and a groove depth of 6.0 to 16.0 mm extending in a tire circumferential direction, wherein, on groove walls on both sides forming the at least three circumferential grooves, first inclined walls inclined by an inclination angle of 5 to 20 degrees with respect to the tire circumferential direction and second inclined walls inclined by an inclination angle of 0 to 45 degrees with respect to a tire width direction are provided so as to be successively connected in the tire circumferential direction so that positions of groove ends in the tire width direction vary in the tire circumferential direction.

Abstract: A tire for All Terrain Vehicles includes the first ribs located within a central area of the tread, which are non-continuously arranged, and the second ribs which are next to the ATV. The first ribs are separated by first gaps and the second ribs are separated by second gaps, the first and second gaps are located alternatively to each other.

Abstract: The invention is directed to a pneumatic radial ply truck tire having a tread with a tread depth D, at least two circumferential grooves dividing the tread into at least a first shoulder circumferential rib, an intermediary circumferential rib, and a second shoulder circumferential rib, the tire being characterized by the tread having a base region disposed at depth D and a cap region over the base region, the base region and the cap region adjoining along a boundary, the cap region comprising a cap rubber composition having properties measured at 23° C. of: elongation of 400 to 500%, true tensile of 77 to 83 MPa, 300% modulus of 9 to 11 MPa, tensile strength of 14 to 15 MPa, shore A hardness of 63 to 68, rebound of 20 to 25%; and the base region comprising a base rubber composition having properties measured at 23° C. of: elongation of 470 to 520%, true tensile of 135 to 150 MPa, 300% modulus of 13 to 15.5 MPa, tensile strength of 22 to 25 MPa, shore A hardness of 63 to 67, rebound 50 to 55%.

Abstract: A pneumatic tire comprises circumferentially-continuously-extending crown main grooves and shoulder main grooves to divide the tread portion into one crown rib, two middle ribs and two shoulder ribs. The middle rib is provided with a circumferentially-continuously-extending middle sub groove to define an axially inner part and an axially outer part. The axially inner part is provided with inner middle lug grooves comprising an axially outer wide main part and an axially inner narrow part. The axially outer part is provided with outer middle lug grooves comprising an axially outer main part an axially inner sipe-like narrow part . The width and position of the middle sub groove, and the widths of the lug grooves are specifically defined in order to improve the wet performance and noise performance in a well balanced manner while maintaining the steering stability.

Abstract: A pneumatic tire having a tread surface provided with a plurality of circumferential grooves and lateral grooves each having one end opened into that circumferential groove and the other end terminating in a land portion. At least one lateral groove is always included completely in the ground contact surface of the tread. The groove width of the lateral grooves is at least locally not less than 30% of the groove width of the circumferential grooves. Each lateral groove has an extending length not less than 40% of an extending length of the circumferential grooves in the ground contact surface and is provided with a region having a cross-sectional area which increases from its side of opening into the circumferential groove toward its terminal end, and including a starting end with a minimum cross-sectional area that is situated closer to the circumferential groove in which the lateral groove opens.

Abstract: In the pneumatic tire in which not less than three main grooves 1 extending in the tire circumferential direction R are formed and ribs 2 are formed by the main grooves 1, upper edges 11 of the main groove 1 when the tire is new extend in a linear manner in the tire circumferential direction R, the bottom 12 of the main groove 1 extends in a zigzag manner in the tire circumferential direction R, the sidewalls 13 of the main groove 1 is provided with concave portions and convex portions, and in the concave portion of at least one of the sidewalls 13 of the main groove 1, the protrusions 3 that is joined to the bottom 12 of the main groove 1 and to the sidewall 13. Further, the pneumatic tire may be provided with sipes or notches that extend from the concave portion to the inner side of the rib 2 in the tire width direction.

Abstract: A motorcycle tire comprises a tread portion having a tread face curved along a radially outwardly convex arc in the cross section of the tire including the rotational axis of the tire. The tread face is provided in the ground contacting region during straight running with three parallel circumferential grooves which are: a wide circumferential groove having a width Wg1 of from 8 to 16 mm and extending along the tire equator; and a pair of narrow circumferential grooves disposed one on each side of the tire equator and having a width Wg2 less than the width Wg1. Each of the narrow circumferential grooves is positioned such that the distance L1 measured along the tread face from the tire equator to the axially outside edge of the narrow circumferential groove is not more than 35% of the width (tw) of the ground contacting region during straight running measured along the tread face.

Abstract: A pneumatic radial ply truck tire for use on medium truck trailers includes a tread, a casing with two sidewalls, one or more radial plies extending from, and wrapped about, two annular beads, and a belt reinforcement structure located radially between the tread and the one or more radial plies. The tread includes a plurality of circumferentially extending tread grooves, a pair of circumferentially extending shoulder ribs, a pair of radially recessed ribs being radially recessed and non-road contacting under static load disposed at a lateral edge of the shoulder ribs, and a pair of circumferentially extending decoupling grooves. Each decoupling groove defines a transition between a corresponding shoulder rib and a corresponding recessed rib. A lateral edge of one of the shoulder ribs has a first radius of curvature forming a transition from a radially outer surface of the shoulder rib to a first side surface of the corresponding decoupling groove.

Abstract: A pneumatic tire is mounted onto a rim with maximum loading, and with an air pressure corresponding to maximum loading, such that the ground contact shape has a gradually decreasing circumferential direction length from the tire width direction center to the portion corresponding towards the tire width direction outermost circumferential groove, followed by the ground contact shape having a gradually increasing circumferential direction length towards the tire width direction outside. In the ground contact shape, the relationships 0.02?(A?B)/L?0.1, and 0.02?(C?B)/L?0.1 are satisfied, in which A is the maximum length in the circumferential direction of the tire width direction outermost rib, L is the circumferential direction length of the tire width direction center, and B and C are distances in a tire circumferential direction which depend on the width of the tire width direction outermost rib and the width of the second rib from the outside in the tire width direction.

Abstract: A retreaded pneumatic truck tire includes a used carcass having a uniform annular attachment area and a retread element. The retread element secures to the attachment area of the used carcass. The retread element has a tread pattern comprising a first circumferential groove separating the tread pattern into a first shoulder rib and an intermediate rib and a second circumferential groove separating the tread pattern into the intermediate rib and a second shoulder rib. The tread pattern further comprises a first plurality of identical arcuate notches extending axially and circumferentially across the first circumferential groove and a second plurality of identical arcuate notches extending axially and circumferentially across the second circumferential groove. The first plurality of arcuate notches are offset circumferentially from the second plurality of arcuate notches.

Abstract: A pneumatic tire of the invention includes: a stepped-shaped raised area provided in the main groove positioned at a center area of the tire so as to be continued circumferentially of the tire, connected to either the main groove walls, and raised from the groove bottom; and a ridge lower than a tread surface of the tire in each of the main grooves on both outsides of the main groove at the center area of the tire so as to be raised from the center of the groove bottom continuously along the length thereof without being joined with the groove walls, and the angle of inclination of the main groove walls with respect to the normal line of the tangential line on the tread surface of the main groove portion is parallel to each other or is 5° or smaller.

Abstract: The offset amount that a sacrificial rib road contact surface is recessed to the inner side of a tire with regards to a shoulder rib road contact surface is equal to 0, and a circumferential fine groove is provided such that the opening side thereof is located on the inner side when the tire is filled to a proper internal pressure. The dimension Ws in the tire width direction of the shoulder rib road contact surface and the dimension Wa in the tire width direction of the sacrificial rib road contact surface are set such that 0.10?Wa/Ws?0.2. The dimension Wb in the tire width direction of the sacrificial rib road contact surface when the groove depth of the circumferential main grooves has worn 20% is set in a range such that 0.25?Wb/Ws?0.30.

Abstract: A pneumatic tire for heavy load enabling the co-existence of wet performance and uneven wear resistance performance is provided. The pneumatic tire for heavy load includes three circumferential main grooves 31 and 33 extending on a tread in the circumferential direction, and ribs 11 and 12 defined by these circumferential main grooves 31 and 33. The centerline of the center circumferential main grove 31 among the three circumferential main grooves is positioned on the equator line of the tread, and a thin rib-shaped uneven abrasion sacrificing part (BCR) 21 having a step in a clearance thereof from the surface of the tread is formed only in the center circumferential main groove 31.

Abstract: A pneumatic tire where the positions of the groove deepest portions (33btm) in the circumferential grooves (33) vary in a predetermined cycle along the circumferential direction in a width direction of the tread within the circumferential grooves (33). Moreover, depth direction positions, where a groove bottom surface of the circumferential groove (33) contacts with each of perpendicular lines (perpendicular line P1, perpendicular line P2) which are perpendicular or approximately perpendicular to a tread surface and which pass respectively through edges (edge portion 11eg, edge portion 12eg) of the land portions on a side of each of the circumferential grooves of ribs, as well as angles which are formed by the perpendicular lines and a section line of a cross-section of the groove bottom surface in the width direction of the tread surface vary in the predetermined cycle along the circumferential direction.

Abstract: A groove bottom of a circumferential groove formed in a tread surface is provided with a protruding stripe extending along an extending direction of the circumferential groove. The protruding stripe is provided with a top head portion protruding toward a tire outer circumferential side, and a base portion which is narrower than the top head portion and connects the top head portion and the groove bottom. If a small stone is pinched, the top head portion is inclined around the base portion, and the protruding stripe is deflected as a whole, thereby generating a reaction force on the basis of a deformation restoring force.

Abstract: A pneumatic tire having improved wear resistance, especially improved uneven wear resistance (such as river wear), is offered. The tire that is a rib-pattern tire has five ribs extending circumferentially of the tire. The ribs include a center rib and intermediate ribs located on the opposite sides of the center rib that is located on the equator line of the tire. Closed sipes are formed at least in the center rib and in the intermediate ribs. Each sipe is located in the lateral center of the corresponding rib. Both ends of each sipe terminate within the corresponding rib. The closed sipes are successively offset circumferentially among the ribs and arranged in a periodic pattern on the outer surface of the tire. The closed sipes in the ribs are so arranged that when they are optically projected onto the equator line of the tire, the sipes do not overlap circumferentially of the tire among the ribs.

Abstract: A heavy-duty tire comprises a tread portion provided with at least three circumferentially continuously extending ribs divided by at least two circumferential grooves extending straight in the tire circumferential direction, wherein the ribs have side edges adjacent to the circumferential grooves; each of the side edges is provided with edge sipes at intervals in the tire circumferential direction; each of the edge sipes extends parallel with the tire axial direction from the adjacent circumferential groove and terminates in the rib; each of the edge sipe has an axial length in a range of not less than 5% but not more than 15% of the axial width of the rib, a thickness in a range of not less than 0.3 mm but not more than 1.0 mm and a depth in a range of not less than 50% but not more than 100% of the depth of the circumferential groove; and the total number of the edge sipes per tire is in a range of from 4 to 8 times the value of the tire diameter in millimeter.

Abstract: A pneumatic tire includes a tread surface having a middle rib defined by a first circumferential groove and a second circumferential groove in its center region. Middle lateral grooves, that obliquely extend in the widthwise direction of the tire, are disposed at predetermined intervals in the tire circumferential direction in the middle rib; only one terminal end of each middle lateral groove communicates with one circumferential groove of the first and second circumferential grooves. An assistant groove is provided between each of adjacent middle lateral grooves; the assistant groove extends in such an inclined manner that the inclination direction thereof with respect to the tire circumferential direction is opposite to that of the middle lateral grooves; a block is defined by the assistant groove, middle lateral grooves and one circumferential groove.

Abstract: A circumferential sipe extends continuously in the circumferential direction of the tire in the center region of the tread surface section of a rib defined between circumferential grooves. Widthwise sipes are disposed at prescribed intervals in the circumferential direction of the tire in the tread surface section, the widthwise sipes extending in the widthwise direction of the tire in crossing relationship to the circumferential sipe, the widthwise sipes each having opposing terminal ends open to the circumferential grooves. The circumferential sipe changes in depth periodically in such a manner that the circumferential sipe is shallow between adjacent widthwise sipes. The widthwise sipes changes in depth in such a manner that they are greater in depth in the center region and end regions of the tread surface section.

Abstract: A pneumatic tire includes a tread surface on which a plurality of circumferential groove portions is formed. From among circumferential groove portions, a circumferential groove portion situated closest to a shoulder portion side in a tire width direction has a center of a groove-bottom innermost portion at a portion where a groove width in at least a tire circumferential direction is the narrowest, positioned closer to an equatorial surface in the tire width direction than a center of the groove width. An angle between a virtual extension portion of the tread surface and a groove wall on the equatorial surface side is equal to or less than an angle between the virtual extension portion of the tread surface and a groove wall on the shoulder portion side.

Abstract: A tyre for a motor car includes a tread and two shoulders. The tread includes at least one circumferential row of blocks disposed between first and second circumferential grooves. Each of the blocks is delimited by a section of the first circumferential groove and by first and second transverse grooves that extend from the first circumferential groove and converge at a common vertex spaced from the second circumferential groove. The common vertex is separated from the second circumferential groove by a continuous circumferential tread rib. A second transverse groove that delimits a first block is separated from a first transverse groove that delimits a circumferentially adjacent block by a solid tread portion. The solid tread portion extends from the first circumferential groove to the circumferential tread rib and forms a single body with the circumferential tread rib, spacing the first block and the circumferentially adjacent block from each other.

Abstract: A pneumatic tire includes a tread surface having a plurality of main grooves extending straight in a circumferential direction of the tire. The plurality of main grooves defines land portions extending in the tire circumferential direction. The land portions each have a ground contact surface comprising a first circular are having a single curvature radius in tire meridian cross section. The ground contact surface of at least the land portion which is located second when counted from the outer side of a vehicle when the tire is mounted thereon, is arranged so as to have the first circular are and at least a second circular are connected thereto on the vehicle outer side thereof. The circular are located closer to the vehicle outer side has a smaller curvature radius and is positioned more inwardly away from the tread surface.

Abstract: A tread for a heavy vehicle tire, comprising at least one tread design component (3) delimited by at least two grooves, each component comprising a contact face (4) limited by edges (7, 8); the contact face (4) having, viewed in a cross-sectional plane substantially perpendicular to the contact face of the tread and cutting two of the edges of the motif at A1 and A2, a plot whose geometrical profile P between the points A1 and A2 has at least one bump (9, 10) in relief relative to a virtual straight line D passing through the points A1 and A2, the point B1, B2 of each bump (9, 10) that is furthest from the straight line D being located a height Hi from this straight line and a distance Di from the point A1 or A2 that is the closer, with 0.1<Di/L<0.25, where L is the distance separating the points A1 and A2, and 0.1 mm<Hi<2.5 mm.

Abstract: A tire having sipes is provided. The tire includes a circumferential tread configured with at least one rib bound by at least one groove. The rib has a plurality of sipes that extend from the groove into the rib wherein one or more of the sipes narrow in a direction from the groove into the rib.

Abstract: A tread (1) for steer axle tires for a heavy vehicle, the tire having a preferred direction of travel, the tread comprising grooves (2) of generally circumferential orientation defining at least three ribs (30, 31, 32, 33, 34), two of the ribs forming the edges (30, 34) of the tread, some of the intermediate ribs (31, 32, 33) being provided with a plurality of incisions (41, 42, 43), of general transverse orientation and substantially parallel to each other, the incisions having an average inclination other than zero relative to the direction perpendicular to the running surface of a new tread, this tread being characterised in that, when viewed in a section plane perpendicular to the axis of rotation of the tyre, the incisions in the intermediate ribs form, on and in the vicinity of the running surface when new of the tread, an angle close to or equal to 0° with a line perpendicular to said surface at the point of intersection, whereas the angle of each of these incisions increases in the depth of the tread.

Abstract: A pneumatic tire with a shoulder rib and lateral grooves defined in a shoulder rib. A tread and shoulder of the tire are joined along a shoulder edge. The tread includes a circumferential groove defining the shoulder rib, which is adjacent to the tire's shoulder. The lateral grooves, which intersect the shoulder edge, extend laterally across the shoulder rib, but do not intersect the circumferential groove.

Abstract: A tire including a tread rubber having at least one positive profile. Wherein the positive profile is formed by at least one circumferential groove. Further, the tire includes at least one truncated groove extending into the positive profile from the circumferential groove, such that the truncated groove includes at least one flank surface. Further still, the tire includes the truncated groove being inclined at an acute angle to a direction of rotation of the tire. The tire includes a pitch of the flank surface that continuously changes with respect to the radial direction over a length of the truncated groove. The tire being a vehicle pneumatic tire. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: The present invention provides a heavy load pneumatic tire capable of effectively preventing a river wear from generating while preventing a crack or a stone-biting from generating in a sipeing end. In a heavy load pneumatic tire in which a tread portion has a rib pattern formed with ribs divided by main grooves which are continuous in a circumferential direction of the tire, at least one of the main grooves that is located on the outermost side in a widthwise direction of the tire is provided at its groove bottom with a projecting stripe which is continuous in the circumferential direction of the tire, and the ribs adjacent to an inner side of the main groove are provided with closed sipeings arranged at substantially constant distances from each other.

Abstract: An improved tread pattern for a pneumatic tire includes four or five circumferential ribs including inner and outer shoulder ribs, each having a set of lateral grooves extending from their respective shoulders toward but not reaching an adjacent circumferential groove, the shoulder ribs also having multiple sipes arranged between adjacent pairs of lateral grooves. The width of at least one shoulder rib is between about 17% and about 19% of the width of the tread, while the land-sea surface area ratio defined by the tread is about 4–8% larger than the void volume ratio defined by the tread.

Abstract: An improved truck racing tire includes three belts and reduced tread and undertread thickness for weight reduction. An asymmetric shoulder design is provided and circumferential grooves having wear indicia therein at a preselected depth are incorporated into the tread to divide the tread into plural ribs. Notches are formed within the tread ribs in circumferential patterns of distribution at a depth equivalent to the depth of groove tread wear indicators. The tread is constructed of a relatively softer compound in the cap and a relatively harder compound in the base. The boundary between the cap and the base is at a depth corresponding to the notch depth and the wear indicators within the grooves to provide a further indication and confirmation of wear pattern and magnitude.

Abstract: A tread (12) for a light truck or automobile tire (10) has a continuous rib (30, 32) between an adjacent piece of circumferentially continuous grooves (20, 22, 24). The tread (12) has a plurality of hook-shaped semi-blind grooves (40) originating from the circumferentially continuous grooves (20, 22, 24). Each rib (30, 32) has two rows of circumferentially spaced hook-shaped semi-blind grooves (40).

Abstract: A tread (1) for a tire with a preferred rolling direction, the tread having grooves (2) of substantially circumferential orientation which delimit ribs (30, 31, 32, 33, 35), at least one of which is provided close to each of its traverse edges with a plurality of incisions of width smaller than 1.5 mm. The incisions open onto the contact surface of the tread, are essentially parallel to one another, and having a mean inclination ? different from zero relative to the direction perpendicular to the rolling surface (S) of the tread.

Abstract: A vehicle comprises Anti Lock Brake System (ABS) and front tires and rear tires which are capable of displaying maximum braking effect when the ABS is in operation, each of the tires comprises a plurality of tread elements divided by tread grooves, and the tread pattern rigidity Pr of the rear tire is more than the tread pattern rigidity Pf of the front tire, wherein the tread pattern rigidity P (Pr, Pf) is defined as a quotient of the total of circumferential rigidity of all the tread elements existing in a ground contacting region of the tire which is divided by the area of the ground contacting region, and the circumferential rigidity K of each tread element is defined as a quotient of a tangential force F in kgf received at the ground contacting region which is divided by a displacement y in mm at the ground contacting region.

Abstract: The present invention provides a tire with a sacrificial rib to protect the main ribs of the tire's tread by delaying the onset of irregular wear and the growth thereof. The improved tire tread comprises a plurality of main ribs formed by grooves extending generally circumferentially around an outer surface of the tire to form a main tread width for contacting the supporting surface. A sacrificial rib is provided for contacting the supporting surface at each lateral side of the main ribs. The sacrificial rib is separated from the main ribs by a narrow shoulder groove having a groove width not greater than about 1.5 millimeter. The sacrificial rib has a surface width in the range of about 2.5 percent to about 12 percent of said tread width. The sacrificial rib has a recess defined by a radial offset from a transverse or lateral profile of the main ribs. The offset has a value in the range of about 0.50 millimeter to about 2.0 millimeters when the tire is new.

Abstract: A tire pattern of a tread intended to be fitted on a tire and including a plurality of elements in relief intended to come into contact with the ground on which the tire fitted with such a tread travels. At least one element in relief having at least one lateral wall undercut relative to the running surface of the tread and provided with at least one incision which opens on to the surface wall of the element in relief and on to at least one undercut lateral wall. So as not to alter the rigidity of said element in relief, in a manner which may be disadvantageous for the performance of a tire fitted with this tread, provision is made that, for levels of wear of the tread between a first depth H1 and a second depth H2, each incision does not cut into the edges or ridges of said element in relief. Also, a mold equipped with molding elements for molding such a tread pattern.

Abstract: A tread for a tire includes at circumferentially extending grooves having side walls contoured with upper and lower waveforms that are relatively staggered, or out of phase. The side walls provide alternating protrusions and recesses relative to a perpendicular reference plane passing through upper edges of the groove. A cavity is provided beneath upper groove edges for the entire circumference of the tread, which imparts flexibility and helps avoid the initiation of rail wear.

Abstract: An aircraft tire with two aquachannels (14) provides a wide band area (17) in the central portion of the tread for improved wear properties. The aquachannels each comprise 4.5% to 7% of the tread width based on the design tread width of the tire.

Abstract: A tire with light reflecting fluorescent strips for helping enhance the visibility of a vehicle. The tire with light reflecting fluorescent strips includes a spaced apart pair of side walls and a tread portion connecting the side walls together. The tread portion has a plurality of alternating ridges and grooves therearound. The tread portion also has at least one annular light reflecting reflective strip in at least one of the grooves of the tread portion.

Abstract: A tire having a pair of beads; a carcass ply having ends, each of the ends anchored to a respective one of the beads; at least one belt ply extending circumferentially around the tire and disposed radially outward of the carcass ply; and a tread layer disposed radially outward of the at least one belt ply and formed from a first tread compound. The tread layer has a plurality of tread ribs; at least one groove disposed between adjacent tread ribs; and a groove wall lining covering from the at least one groove. The groove wall lining is made from a second tread compound different than the first tread compound.