Abstract: In a pneumatic tire, a groove opening portion of an inner side shoulder main groove and a groove opening portion of an inner side center main groove have edge portions with a straight shape. A groove opening portion of an outer side center main groove has an edge portion chamfered in a zigzag shape. A groove width Wg1 of the inner side shoulder main groove, a groove width Wg2 of the inner side center main groove, and a groove width Wg3 of the outer side center main groove have a relationship Wg1<Wg3 and Wg2<Wg3.

Abstract: A tire, for which a mounting direction on a vehicle is specified, has a tread portion comprising an outboard shoulder land region provided with outboard shoulder lateral grooves, and an inboard shoulder land region provided with inboard shoulder lateral grooves. The outboard shoulder lateral grooves are bent convexly toward one side in the tire circumferential direction, whereas the inboard shoulder lateral grooves are bent convexly toward the other side in the tire circumferential direction. The bent angle of the outboard shoulder lateral groove is larger than the bent angle of the inboard shoulder lateral groove.

Abstract: Provided is a tire including a tread portion. The tread portion can include three circumferential grooves and four land portions. The circumferential grooves can include two shoulder circumferential grooves and one crown circumferential groove. The land portions can include two shoulder land portions and two middle land portions. The two middle land portions can each include a circumferential sipe, a plurality of first middle lateral grooves, and a plurality of second middle lateral grooves. The two shoulder land portions can each include a plurality of shoulder lateral grooves extending from a tread end and terminating in the shoulder land portion.

Abstract: A pneumatic tire includes circumferential main grooves extending in the tire circumferential direction and a land portion defined by the circumferential main grooves. The land portion includes a through lug groove that passes through the land portion in the tire lateral direction and includes first and second chamfered portions formed on left and right edge portions of the through lug groove. The first chamfered portion opens at one end to one of the edge portions of the land portion and terminates at the other end at a central portion in the groove length direction of the through lug groove. The second chamfered portion opens at one end portion to one of the edge portions of the land portion and terminates at the other end portion at a central portion in the groove length direction of the through lug groove.

Abstract: A pneumatic tire includes two circumferential main grooves disposed in the region on one side of a tire equatorial plane as a boundary and a land portion defined by the two circumferential main grooves. The land portion includes a circumferential narrow groove extending in the tire circumferential direction and sets of a first and a second lug groove extending in the tire lateral direction through the circumferential narrow groove. The first lug groove includes an end portion that opens to the edge portion on one side of the land portion and another end portion that terminates within the land portion. The second lug groove includes an end portion that opens to the edge portion on the other side of the land portion and an end portion that terminates within the land portion. The first lug groove and the second lug groove are alternately disposed in the tire circumferential direction.

Abstract: A pneumatic tire includes: a center lug groove extending in a lateral direction in a center land portion, the center lug groove connecting to two main groves at both ends; an outer middle lug groove extending in the lateral direction in an outer middle land portion, the outer middle lug groove connecting to two main groves at both ends; and an inner middle lug groove extending in the lateral direction in an inner middle land portion, the inner middle lug groove including an end connecting to the main groove of the two main grooves located inward in the lateral direction and the other end terminating within the inner middle land portion; and the center lug groove and the outer middle lug groove each including a central region in a length direction including a sipe portion, the sipe portion including a sipe with a chamfered opening portion.

Abstract: A tire, the speed rating of which is at least V, comprises a tread, having a volumetric void ratio at least equal to 2% and at most equal to 20%, having a central part Pc comprising at least one groove, and two lateral parts PI each having a volumetric void ratio at most equal to 2%. The central part Pc of the tread has an axial width at most equal to one third of the axial width LBDR of the tread, and any portion of the central part Pc of the tread that is circumferentially delimited by two meridian planes separated by a circumferential distance dc equal to one tenth of the outer perimeter P of the tire comprises at least one and at most three grooves that open onto the meridian planes delimiting the portion in question.

Abstract: Tread (1) having tread surface (10) axially bounded by edge parts (11), and provided with cuts (3, 4) delimiting material parts forming raised elements (2), each raised element (2) comprising contact face (20), there being formed, in a plurality of raised elements (2), a ventilation cavity (5) having a depth at least equal to 70% of the thickness of the tread material to be worn away, each ventilation cavity (5) being delimited by wall surface (50) ending at bottom surface (530). Each ventilation cavity (5) comprises first cavity part (51) continued into the depth by second cavity part (52). The first cavity part (51) is situated between the tread surface and intermediate depth level H1 situated at between 30% and 70% of maximum depth H of ventilation cavity (5), the mean relief angle A of the wall is at least equal to 20 degrees. In the second cavity part (52), mean relief angle B of the wall is at most equal to 15 degrees.

Abstract: Provided is a pneumatic tire including center main grooves, shoulder main grooves, a center land portion, middle land portions, shoulder land portions, and lug grooves provided in each shoulder land portion. The pitch of the lug grooves is changed on the tire circumference. The profile line L1 that defines the road contact surface of the center land portion protrudes further to the outer side in the tire radial direction than the standard profile line L0. The profile line L2 that defines the road contact surface of the middle land portion and the shoulder land portion protrudes further to the outer side in the tire radial direction than the standard profile line L0. The ratio of the groove volume of the lug grooves to the size of the pitch of the lug grooves in the shoulder land portion decreases as the pitch increases, and increases as the pitch decreases.

Abstract: A pneumatic tire includes a tread having a tread surface, circumferential main grooves on the tread, and land portions formed between the circumferential main grooves. Each of the circumferential main grooves has, in a lateral cross-sectional view, a groove bottom surface, an outside groove wall surface, an inside groove wall surface, an outside curved portion connecting the groove bottom surface with the outside groove wall surface, and an inside curved portion connecting the groove bottom surface with the inside groove wall surface. In the lateral cross-sectional view, (a minimum curvature radius of the outside curved portion)>(a minimum curvature radius of the inside curved portion) is satisfied. (the groove wall angle ? [between a tread normal line and the outside groove wall surface])<(the groove wall angle ? [between a tread normal line and the inside groove wall surface]) is satisfied.

Abstract: An inner end (27a) of a slit (27) provided in a shoulder rib (25) in a tire width direction is terminated within the shoulder rib (25). The shoulder rib (25) includes a slit region (30) that has the slit (27) and a rib region (31) that has not the slit (27). The shoulder rib (25) protrudes to the outside of a tire reference profile line L on a cross-section in the tire width direction and has a protrusion peak (33) in the rib region (31). A ground contact surface of the shoulder rib (25) draw, on a cross-section in the tire width direction, an arch (M) passing through a ground contact end (22), the protrusion peak (33), and a point (34) on an inner sidewall of a shoulder-side main groove (21) in the tire width direction. The arch (M) passes through a point (35) on the tire reference profile line (L) or outside the tire reference profile line (L) in a normal direction of the tire reference profile line (L) at an inner end of the shoulder rib (25) in the tire width direction.

Abstract: A pneumatic tire, including: a lug groove opening at an end of a ground contact surface of a tread portion and extending toward the tire equatorial plane of the ground contact surface to terminate before reaching the tire equatorial plane; a communication groove making a corresponding pair of the lug grooves located on respective sides of the tire equatorial plane communicate with each other; and at least one widthwise groove, formed in a ground contact surface region demarcated between the end of the ground contact surface and the tire equatorial plane and between one pair and another pair adjacent thereto in the tread circumferential direction of the lug grooves and the communication groove communicating therewith, such that the widthwise groove extends in a direction of a tread width and an end thereof on the outer side in the tread width direction terminates within the ground contact surface region.

Abstract: The present technology pertains to a pneumatic tire having an asymmetrical pattern, which is formed by grooves, formed on a tread portion. A ratio SW/OD between the total width SW and the outer diameter OD of the pneumatic tire satisfies SW/OD?0.3. A groove area ratio in a ground contact region G in the tread portion is GR, and a range from a tire equator line CL to the vehicle side in the ground contact region is a tire inside region Ai and the groove area ratio in the tire inside region Ai is GRi, and a range from the tire equator line CL to the opposite side of the vehicle side in the ground contact region is a tire outside region Ao and the groove area ratio in the tire outside region Ao is GRo, the ground contact region satisfies 10%?GR?25%, GRo.

Abstract: A pneumatic tire comprises a tread portion provided with a central main groove, an outboard shoulder main groove and an inboard shoulder main groove extending continuously in the tire circumferential direction. The central main groove and the inboard shoulder main groove are each connected to grooves and/or sipes. The outboard shoulder main groove is widest and not connected to any grooves inclusive of a sipe or a very narrow groove. On both sides of the outboard shoulder main groove, there are formed sloping surfaces extending from the respective groove edges and merging into the tread surface. The width of each sloping surface is more than the depth thereof.

Abstract: A pneumatic tire includes a tread portion that includes three main grooves extending in the tire circumferential direction, and four rows of land portions defined by each of the main grooves, wherein, in each of two rows of center land portions located on a tire equator side, one narrow groove extending in the tire circumferential direction and a plurality of inclined grooves extending from the narrow groove towards the outer side in the tire width direction are provided, in each of the two rows of shoulder land portions located on shoulder sides, a plurality of lug grooves extending in tire width direction and not connecting to the main grooves is provided, and a distance on the vehicle outer side and a distance on the vehicle inner side from groove edges on shoulder land portion sides of side main grooves to the tire equator are equal.

Abstract: A circumferential narrow groove of a pneumatic tire is disposed at a position that partitions an outer side second land portion and an outer side shoulder land portion. A center land portion is a rib that is continuous in a tire circumferential direction, and an inner side second land portion and the outer side second land portion are rows of blocks divided in the tire circumferential direction by pluralities of lug grooves. Additionally, a groove area ratio S2 of the center land portion, a groove area ratio S1 of the inner side second land portion, and a groove area ratio S3 of the outer side second land portion have a relationship such that S2<S3<S1. Moreover, a groove width Wd of the circumferential narrow groove and a maximum groove width Wmax of the other three circumferential main grooves to have a relationship such that 3.1?Wmax/Wd?5.0.

Abstract: A pneumatic tire comprises an asymmetric tread pattern with a designated install direction to a vehicle having an outboard tread edges, the tread pattern having an outboard tread portion between the outboard tread edge and a tire equator and provided with an outer main groove, the outer main groove having a cross section comprising a bottom with a depth of 5.5 to 6.5 mm, and axially inner and outer groove walls each extending from the bottom to a tread contact surface, respectively, at least one of groove walls having a stepwise shape comprising a radially inner portion extending from the bottom with a height of 2.0 to 4.0 mm, an axially extending stepped portion extending from the radially inner portion with a length of 0.75 to 1.25 mm, and a radially outer portion between the stepped portion and the tread contact surface.

Abstract: A pneumatic tire has an asymmetric tread pattern. The width of an outboard shoulder main groove (3) is 3 to 4% of the tread width TW. The width of an inboard shoulder main groove (4) is 5 to 6% of TW. The width of an outboard crown main groove (5) is 6 to 7% of TW. The width of an inboard crown main groove (6) is 6 to 7% of TW. In each of the grooves (4, 5, 6), an outboard groove face's angle ?1 is more than an inboard groove face's angle ?2, wherein ?1 is 13 to 19 degrees, and ?2 is 9 to 14 degrees. In the groove (3), an outboard groove face's angle ?3 is 9 to 14 degrees, and an inboard groove face's angle ?4 is 5 to 8 degrees.

Abstract: A tread portion 2 of a pneumatic tire is divided by a center longitudinal groove and a shoulder longitudinal groove into a center land portion 6, an outer middle land portion 7A, an inner middle land portion 7B, an outer shoulder land portion 8A, and an inner shoulder land portion 8B. The outer shoulder land portion 8A includes an array of outer shoulder blocks 22 which are sectioned by outer shoulder lateral grooves 5A. The inner shoulder land portion 8B includes inner shoulder lateral grooves 26 having an inner end 26i and an outer end 26o in the land portion 8B, and inner shoulder auxiliary grooves 28 disposed between the inner shoulder lateral grooves 26, 26 which are circumferentially adjacent to each other and having inner ends 28i and outer ends 28o in the land portion 8B.

Abstract: A pneumatic tire comprises a tread portion provided with a shoulder main groove, shoulder lateral grooves extending from the shoulder main groove toward axially outwardly, the shoulder main groove extending in a zigzag manner comprising linear portions and curved portions which are arranged alternately in a circumferential direction of the tire, each linear portion inclined with respect to the circumferential direction of the tire, each curved portion having a radius of curvature of from 12-80 mm, the curved portion protruding toward axially outwardly of the tire, the shoulder main groove having a pair of groove edges and a circumferential space therebetween which straightly extends along the circumferential direction of the tire without coming into contact with both groove edges and the circumferential space with an axial width of from 0.2 to 0.7 times an axial groove width of the shoulder main groove.

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: A pneumatic tire including at least four circumferential main grooves extending in the tire circumferential direction and a plurality of rib-like land portions partitioned by the circumferential main grooves in the tread portion. Additionally, an outer side second land portion includes a zigzag narrow groove having a zigzag shape, extending in the tire circumferential direction, and dividing the outer side second land portion in the tire width direction; and a plurality of first sipes disposed at a predetermined pitch in the tire circumferential direction, extending from an edge portion on the outer side in the tire width direction of the outer side second land portion toward the inner side in the tire width direction, and terminating prior to the zigzag narrow groove, leaving a gap for ventilation.

Abstract: A pneumatic tire for improving steering stability performance on dry and wet road surfaces. The tire tread pattern has circumferential center main grooves, outside and inside main grooves, land sections demarcated by the main grooves, ground contact borders on both sides of the tire, and closed shoulder lug grooves. A ratio Wmax/Wout of a maximum main groove width Wmax and an outside main groove width Wout is at between 1.5 and 2.5 inclusive. A ratio Sin/Sout of a groove area ratio Sin of a region on a tire-widthwise second side of a tire centerline and a groove area ratio Sout of a region on a first side of the tire centerline is at least 1.10 and smaller than 1.25. A groove area ratio of a region on the second side of a tire-widthwise centerline of the intermediate land sections exceeds that of a region on the first side.

Abstract: Provided is a studless tire capable of achieving both the traction performance and the steering stability at the time of traveling on the ice and snow at a high level. A tread surface 10 is disposed on the studless tire such that, among lateral grooves 3A, 3B, 3C, 3D, 5 extending in an axial direction within each block array 2A, 2B, 2C, 2D, an axial length of a lateral groove 3A, 3B, 3C, 3D opening to at least one straight circumferential groove 1, 1A, 1B adjacent to the block array provided with the lateral groove is referred to as a groove edge component, a proportion of the total length of the groove edge components on the inner tread surface IN to the total length of the groove edge components on the outer tread surface OUT is 1.03-1.3, and, a proportion of a negative ratio of the outer side surface OUT to a negative ratio of the inner side surface IN is 0.85-1.0.

Abstract: A pneumatic tire comprising a tread portion, side wall portions, and bead portions. The tread portion of said pneumatic tire includes at least one groove unit including a main groove extending in a tire circumferential direction and an auxiliary groove extending in the tire circumferential direction that has a smaller width than that of the main groove. The main groove and/or the auxiliary groove meanders in a wave or zigzag manner, and the main groove and the auxiliary groove intersect so as to intertwine with each other. Additionally, a rib portion extending in the tire circumferential direction is disposed adjacent along the groove unit including the main groove and the auxiliary groove.

Abstract: A pneumatic tire has an asymmetric tread pattern and an outboard tread edge and an inboard tread edge to be located outside and inside of a vehicle respectively. Inboard shoulder blocks have an axial width and outboard shoulder blocks have an axial width more than the axial width of the inboard shoulder blocks. The inboard and outboard shoulder blocks are each provided with a plurality of sipes. The sipes of each outboard shoulder block include a circumferential sipe as the axially outermost sipe. The circumferential sipe extends at an angle of not more than 10 degrees with respect to the tire circumferential direction. The outboard shoulder block has an axially outer sidewall of which surface is provided with a plurality of narrow buttress grooves extending radially inwardly from the outboard tread edge.

Abstract: A tread for a tire provided with a pattern comprising a plurality of main grooves formed on each half of the tread on each side of a median plane X-X?, each of these main grooves, of mean width L, opening axially to the outside and extending axially inward as far as a distance from the median plane X-X? that is comprised between 2.5 and 10% of the width TW of the tread, these main grooves giving this tread a preferred direction of running, this tread further comprising a plurality of additional grooves comprising a first and a second end, the mean direction connecting the first and second ends forming, with the circumferential direction, a small angle A greater than zero degrees and at most equal to 20 degrees, this tread being characterized in that opening onto each main groove is at least one additional groove and in that the axially innermost end of each additional groove comes into contact with the road surface before the axially outermost end of the same additional groove.

Abstract: The pneumatic tire includes a tread pattern having a land portion sandwiched between tire circumferential grooves. A groove area ratio of the tread pattern is different between areas on opposite sides with reference to a tire center line in a tire width direction. A first side has the larger groove area ratio and a second side has the smaller groove area ratio respectively. The land portion is protruding outward in a tire radial direction and the land portion has edge portions bordering the tire circumferential grooves and formed by groove walls of the tire circumferential grooves sandwiching the land portion and a surface of the land portion. A drop length of the edge portion facing to the first side from a most protruding point of the land portion along the tire radial direction is longer than a drop length of the edge portion facing to the second side.

Abstract: A pneumatic radial tire includes a pair of annular bead portions 2A, 2B, a tread portion 3 having a tread surface portion, a pair of sidewall portions 4A, 4B each connecting one of both end portions of tread portion 3 in tire-width directions and an outward end in the tire-radial direction of the corresponding one of the bead portions 2A, 2B, and a carcass layer 5 extending continuously across and through the bead portions 2A, 2B, the sidewall portions 3, and the tread portion 4A, 4B, the carcass layer 5 being configured to form a framework of the tire.

Abstract: A tire for a vehicle wheel includes a tread band. The tread band includes a pattern, including at least two circumferential portions, an elongated ridge, and at least two shoulder blocks. The at least two circumferential portions are disposed in axial side-by-side relationship. At least one of the circumferential portions includes a first geometric module repeated along a circumferential extension direction of the tire. The elongated ridge is bounded by two grooves oblique to the circumferential extension direction and is divided into a plurality of intermediate blocks with respect to an axial extension direction of the tread band. The intermediate blocks are bounded by a plurality of cuts substantially transverse to the elongated ridge. The at least two shoulder blocks are associated with the elongated ridge, are circumferentially aligned along a side edge of the tread band, and are bounded by grooves oriented substantially transversely to the circumferential extension direction.

Abstract: A tire for a motor vehicle, in particular a high-performance, tire is provided with a tread having an overall width. The tread includes first and second circumferential grooves which separate a central region from first and second shoulder regions. The tread includes a circumferential cut in the first shoulder region at a distance from the first circumferential groove; and a plurality of circumferentially repeated transverse groove modules. A first shoulder portion of each transverse groove module includes at least one main transverse groove which includes a first substantially rectilinear portion inclined by a first angle with respect to a radial plane, a second substantially rectilinear portion inclined by a second angle with respect to the radial plane and arranged between the circumferential cut and the first circumferential groove, and a first curve portion connecting the first and the second substantially rectilinear portions.

Abstract: A pneumatic tire comprises a tread portion provided with a shoulder main groove, shoulder lateral grooves extending from the shoulder main groove toward axially outwardly, the shoulder main groove extending in a zigzag manner comprising linear portions and curved portions which are arranged alternately in a circumferential direction of the tire, each linear portion inclined with respect to the circumferential direction of the tire, each curved portion having a radius of curvature of from 12-80 mm, the curved portion protruding toward axially outwardly of the tire, the shoulder main groove having a pair of groove edges and a circumferential space therebetween which straightly extends along the circumferential direction of the tire without coming into contact with both groove edges and the circumferential space with an axial width of from 0.2 to 0.7 times an axial groove width of the shoulder main groove.

Abstract: A pneumatic tire including five land portions in a tread surface 1 by providing four main grooves in a ground contact region of the tread surface, wherein positions and groove widths of the main grooves are specified together with only one land portion positioned outermost on a vehicle outer side when mounted on a vehicle being formed into a block row, and the other land portions being formed into ribs, and a groove area proportion of the tread surface is larger on a vehicle inner side than the vehicle outer side with a tire equator and center lines of some of the land portions as boundaries.

Abstract: A pneumatic tire having on-snow performance improved by increasing traction performance on snow-covered road with maintaining dry grip performance high, and comprising tread surface 2 having at least one circumferential main groove 3 in an outer region 2o facing outward of a vehicle, the circumferential main groove 3 being a straight groove wherein ridge lines 21 at which groove wall surfaces 20 intersect with the tread surface 2 extend straight, each groove wall surface 20 comprising a gently-inclined upper wall surface 20U extending from the ridge line 21 at an angle ?1 of 40 to 60° with respect to a normal line to tread surface 2 and a steeply-inclined lower wall surface 20L extending to groove bottom 22 at an angle ?2 smaller than the angle ?1, and the lower wall surface 20L including projections 23 which are disposed at intervals in the circumferential direction and have a triangular cross section with slope surface 23S extending from lower end Ue of the upper wall surface 20U to groove bottom 22 at an a

Abstract: A tire having an asymmetric tread pattern that land proportion of outer side area 2o is larger than inner side area 2i, but having a reduced difference in drainage performance between tires on right and left wheels, the tire having tread surface 2 divided by four circumferential grooves 3 and 4 into center land 5, middle lands 6, 6 and shoulder lands 7, 7, wherein middle land 6o and shoulder land 7o in the outer side area 2o are divided respectively by outer middle lateral grooves 8o and outer shoulder lateral grooves 10o into blocks 9o and blocks 11o, inclination direction of the middle lateral grooves 8o is opposite to that of the shoulder lateral grooves 10o with respect to tire axial direction, and the lateral grooves 8o and 10o are inclined at an angle ?mo between 5° and 45° and at an angle ?so between more than 0° and not more than 40°, respectively.

Abstract: A pneumatic tire has a tread pattern including a plurality of main grooves extending along a tire circumferential direction, and a shoulder land portion constructed by a rib or a block row formed in an outer side in a tire width direction of the main groove positioned in an outermost side. A circumferential sipe is provided in each of the shoulder land portions in both sides in the tire width direction. The number of the circumferential sipes provided in the shoulder land portion in a vehicle inner side is larger than the number of the circumferential sipes provided in the shoulder land portion in a vehicle outer side.

Abstract: A pneumatic tyre for a car having a tread, including a central portion disposed astride an equatorial plane and two shoulder portions. The central portion is separated from the tread shoulder portions by two circumferential grooves and at least one circumferential row, included between a first and a second circumferential groove, is present in the central portion. The tread has a hollow/solid ratio lower than 0.28. The circumferential row comprises transverse grooves extending over at least 80% of the width of the circumferential row. Each transverse groove includes a median line having at least one first rectilinear stretch and one curvilinear stretch. The transverse grooves have a smaller width than that of the circumferential grooves.

Abstract: To enhance uneven wear resistance with achieving higher levels of dry grip performance and wet performance, a tread surface 2 is provided with one circumferential main groove 3 in an outer region 2o thereof directed outward of a vehicle and with first and second circumferential main grooves 4 and 5 in an inner region 2i thereof directed inward of the vehicle, a central region Rc between the circumferential main grooves 3 and 4 is formed into a rib 10 extending continuously in the circumferential direction, an outer shoulder region Ro between the circumferential main groove 3 and TEo is formed into a row of outer blocks 12 defined by inclined main grooves 6, and the outer blocks 12 are provided with inclined sub-grooves 13 having an inclination direction different from that of the inclined main grooves 6, thereby dividing each of the outer blocks 12 into a first block portion 12A on a tire equator side and a second block portion 12B on a ground contact edge side.

Abstract: Steering stability and drainage property are improved in good balance. A center land portion 5 is formed between crown circumferential grooves 3i, 3o which are located on inner side and outer side of a vehicle and extend in the circumferential direction on both sides of the tire equator. In the center land portion 5 are disposed a plurality of curved oblique grooves 8 each of which extends obliquely toward the inner side of the vehicle across the tire equator from its outer end 8a opening at the outer crown circumferential groove 3o, turns toward the outer side of the vehicle, and further extends obliquely up to its inner end 8b located in the center land portion 5, and the respective curved oblique grooves 8 are connected with each other through connecting groove portions 11 each extending in the circumferential direction from the inner end 8b.

Abstract: A pneumatic tire comprises: a tread portion with an inboard and an outboard tread edges; a pair of inboard and outboard center main grooves to define a center portion therebetween; a pair of inboard and outboard shoulder main grooves; an inboard middle portion between the inboard center and shoulder main grooves; an outboard middle portion between the outboard center and shoulder main grooves; an inboard shoulder portion defined the axially outside of the inboard shoulder main groove; an outboard shoulder portion defined the axially outside of the outboard shoulder main groove; the outboard shoulder main groove with a groove width smaller than those of other main grooves; the outboard middle portion having a width larger than that of the inboard middle portion; and a plurality of outboard shoulder lateral grooves each extending from the outboard tread edge to its inner end terminating on the outboard middle portion.

Abstract: A pneumatic tire 10 in which a plurality of circumferential main grooves 11 that extend in the tire circumferential direction are formed in a tread surface portion, and a plurality of land portion rows 14 are partitioned by the circumferential main grooves 11, in which in at least one of the plurality of the land portion rows 14 a circumferential auxiliary groove 15 extending in the tire circumferential direction and having a narrower width and shallower depth than those of the circumferential main grooves 11 is formed in a position avoiding the tire centerline CL, and among both side faces 15a and 15b defining the circumferential auxiliary groove 15, one side face on the tire centerline side extends along the normal direction of the tread surface portion or is inclined to the tire centerline side by 5° or less with respect to the normal direction, and the other side face on the side opposite to the tire centerline side is inclined to the side opposite to the tire centerline side by 10° to 30° with respect to

Abstract: A pneumatic tire is provided on the tread portion (2) with a pair of crown circumferential grooves (3) that extending on either side of the tire equator (C); a pair of shoulder circumferential grooves (4) each extending between the crown circumferential groove (3) and a ground-contacting end (2t); a crown rib (5) extending between the crown circumferential grooves (3); middle ribs (6) each extending between the crown circumferential grooves (3) and the shoulder circumferential grooves (4); and shoulder ribs (7) each extending between the shoulder circumferential groove (4) and the ground-contacting end (2t). The groove volume ratio Rc of the crown rib, which is a ratio of the total volume of the grooves and sipes provided on the crown rib to the rib volume of the crown rib (5), the groove volume ratio Rm of the middle rib (6), and the groove volume ratio Rs of the shoulder rib (7) satisfy the relationship, Rc<=Rm<Rs.

Abstract: A pneumatic tire is disclosed, adapted to highly effectively combine on-ice and on-snow performances. The pneumatic tire includes block groups (G) formed by polygonal blocks (10), which are arranged closely in a tread portion (1). The polygonal blocks (10) are formed by grooves (9) including first groove (9a) with a groove width (W9a) between the polygonal blocks 10 neighboring with each other in the tire circumferential direction. The groove width (W9a) of the first grooves (9a) is larger than a groove width (W9b) of second grooves (9b) between the polygonal blocks 10 neighboring with each other with a zigzag pattern.

Abstract: A pneumatic tire comprising a tread portion, side wall portions, and bead portions. The tread portion of said pneumatic tire includes at least one groove unit including a main groove extending in a tire circumferential direction and an auxiliary groove extending in the tire circumferential direction that has a smaller width than that of the main groove. The main groove and/or the auxiliary groove meanders in a wave or zigzag manner, and the main groove and the auxiliary groove intersect so as to intertwine with each other. Additionally, a rib portion extending in the tire circumferential direction is disposed adjacent along the groove unit including the main groove and the auxiliary groove.

Abstract: The tread band of a tire has two circumferential portions, a central one and an inner intermediate one, respectively, that are subdivided into center and intermediate blocks respectively; an inner-shoulder circumferential portion has first and second inner-shoulder cuts, axially offset from each other and distributed in an alternated sequence, to confine a continuous inner-shoulder rest surface with an undulated course; and an outer intermediate circumferential portion has first and second intermediate cuts, and an outer-shoulder circumferential portion has first and second outer-shoulder cuts. The first and second intermediate cuts and the outer-shoulder cuts, respectively, mutually converge at an angle of about 20° and are axially offset from each other and circumferentially distributed in an alternated sequence, to delimit continuous rest surfaces, an intermediate and outer-shoulder surface respectively, with an undulated course.

Abstract: On a tread surface 1 of a pneumatic tire, at least one circumferential groove is formed on an outer-side region 3 in a vehicle width direction, at least three circumferential, which number is two or more larger than the outer-side region 3, grooves are formed on an inner-side region 2 in the vehicle width direction. A plurality of lug grooves 20 are formed on the tread surface 1, open to a tread edge TE1 of the inner-side region 3, extend in a direction toward circumferential groove 11, and terminate without opening to circumferential groove 11. A plurality of continuous lug grooves 21 are formed on the tread surface 1, open to a tread edge TE2 of the outer-side region 3, extend in a direction toward the circumferential groove 13, continue to the central land portion 5 intersecting the circumferential groove 10, and terminate without opening to the circumferential groove 13 which borders the central land portion 5, among the three second-region circumferential grooves 11, 12, 13.

Abstract: Provided is a low profile pneumatic tire for an SUV, which is capable of having its enhanced rut performance with its dry and wet performances being reconciled with each other. The pneumatic tire according to the present invention has a nominal width of not less than 255, an outside diameter of not less than 720 mm, and an aspect ratio of not more than 55%. The pneumatic tire has a designated direction of sides thereof for mounting the tire on a vehicle. In its tread portion, the pneumatic tire includes five main grooves extending in the tire's circumferential direction, and six land portions defined by the five main grooves.

Abstract: A pneumatic tire having improved driving stability and wear resistance on dry road surfaces and improved running performance on snow. The pneumatic tire includes a tread portion provided with first, second and third main grooves extending in a tire circumferential direction and a plurality of lug grooves each extending from one shoulder side to the other shoulder side. A width of a first land section defined between the first and second main grooves is set greater than a width of a second land section defined between the first and third main grooves, a plurality of inclined grooves are provided in the first land section, where each inclined groove communicates with at least three of the lug grooves while being inclined to the tire circumferential direction, and one end of each inclined groove is open to one of the lug grooves while the other end thereof is terminated within a block.

Abstract: A pneumatic tire according to the present invention improves wet performance. The pneumatic tire has a tread surface 1. A first main groove 2 extending in the circumferential direction TC of the tire is provided in the tread surface 1. First lateral grooves 7 extending from the first main groove 2 outward in the widthwise direction of the tire beyond one ground contact end TX1 of the tire are disposed at prescribed intervals in the circumferential direction TC of the tire. Blocks 8 are defined by the first main groove 2 and the first lateral grooves 7. The first lateral grooves 7 comprise inner groove portions 7A and outer groove portions 7B. The inner groove portions 7A extend with their widths gradually increasing from the first main groove 2 outward in the widthwise direction of the tire to midways of the first lateral grooves 7.

Abstract: In a pneumatic tire 1, a center land portion 5a between center main grooves 3, a middle land portion 5b between the center main groove 3 and a shoulder main groove 4, and a pair of shoulder land portions 5c extending on outer sides of the shoulder main groove 4 in a tire axial direction are divided from each other. The center main groove 3 includes arc groove pieces 6 which are continuously provided in a tire circumferential direction. The arc groove piece 6 includes an arc portion 7 which is curved to swell toward a tire equator C. The middle land portion 5b is provided with a middle inclined groove 9 which extends from an intersection portion K of the arc groove piece 6 toward the shoulder main groove 4.