Abstract: A pneumatic tire comprises a tread portion provided with: an inside circumferential groove (3) near the tread edge (Ti); 1st axial grooves (4) extending from the inside circumferential groove (3) toward the tire equator (C); oblique grooves (5) extending from the respective 1st axial grooves (4) to the outside tread edge (To), while inclining to the opposite direction to the intended tire rotational direction (R); 2nd axial grooves (6) extending from the inside circumferential groove (3) to the oblique grooves (5); and connecting grooves (7) extending between the oblique grooved 5. The tread portion (2) is provided with bent blocks (B1) each made up of an axial part (11) and oblique part (12). The bent point (E1) of the bent block (B1) is positioned on the inside tread edge side of the tire equator (C), and the axial distance (L1) therebetween is 0.10 to 0.25 times the tread width (TW).

Abstract: An automatically traveling floor dust collecting appliance has at least one running wheel having an axis of rotation, a hub, and a tire forming a tire contact area merging radially inwardly into two oppositely situated side faces. The tire, which includes elastic material, has profile blocks, each forming a part of the tire contact area and provided one after the other in the peripheral direction. A running wheel is also provided, in particular for a floor dust collecting appliance. The part of the tire contact area formed by a profile block has a profile which in its cross-section slopes downwardly toward the center. This profile block at the same time forms a part of an associated side face. The profile block, at this transition, radially and in the direction of the axis of rotation, forms a farthest protruding portion of the tire contact area of the tire.

Abstract: A pneumatic tire has a tread portion provided with a center land portion defined between two crown main grooves 3 extending continuously in the tire circumferential direction. The widthwise center line of the crown main groove is made up of successively-arranged circular arcs all oriented toward the same axial direction. The center land portion is provided in its both sides with sloping-surface portions each defined by a sloping surface extending from the radially outer surface of the center land portion to the axially inner groove-sidewall surface of one of the crown main grooves. Each of the sloping-surface portions includes, in its circumferential extent, the circumferential position of one of axially outermost points of the widthwise center line of the adjacent crown main groove.

Abstract: A tire having a carcass reinforcement surmounted radially by a crown reinforcement having at least two working plies, the width Lt of which is equal to the width of the axially narrowest working ply, and surmounted radially by a tread (or “cap”) and interposed radially between the cap and the crown reinforcement by a sublayer (or “base”), this base extending axially and radially under all of the cap and radially on the outside of the crown reinforcement over a total width at least equal to the width Lt of the crown reinforcement, an equatorial plane dividing the cap axially into an outer half cap (TE) and an inner half cap (TI) of the same axial width, the outer half cap (TE) positioned axially towards the outside of a vehicle and the inner half cap (TI) positioned axially towards the inside of the vehicle, the base comprising an additional volume radially under the inner half cap (TI), such that the volume occupied by the base radially under the inner half cap (TI) is greater than the volume occupied by the

Abstract: A tire 1 according to the present invention comprises: a circumferential groove 12 formed in a tread portion; a land portion 22 divided by the circumferential groove 12; and transverse grooves formed in the land portion. The transverse grooves comprise a first transverse groove 32 dividing the land portion into several blocks, and a second transverse groove 51 dividing a block 42 divided by the first transverse groove into a first block portion 61 and a second block portion 62. A groove depth of the circumferential groove contacting the second block is smaller than the groove depth of the circumferential groove contacting the first block.

Abstract: The present invention relates to a pneumatic tire that achieves both dry performance and on-snow performance. A pneumatic tire is provided with a central land portion including the tire equator plane, intermediate land portions, and outer land portions. The central land portion is defined as a rib by a pair of central circumferential grooves and is provided with central sipes extending linearly in the tire width direction. Each intermediate land portion is divided into blocks by intermediate inclined grooves that extend obliquely with respect to the tire circumferential direction and provide communication between one of the central circumferential grooves and an outer circumferential groove, and each intermediate land portion is provided with intermediate sipes inclined at an angle of 0° to 30° with respect to the tire width direction.

Abstract: Embodiments are directed to a pneumatic off-road tire having an inner shoulder, an outer shoulder and a tread therebetween. The tread has a central axis and includes a plurality of generally curved first grooves. Each first groove has a first end disposed near the outer shoulder and a second end disposed near the inner shoulder so that each first groove crosses the central axis. The first end is spaced circumferentially from the second end. A plurality of second grooves, each connecting the second end of a first groove to a first end of another first groove, are included. The first and second grooves define a cascading repetition of tread blocks. Chamfers are defined on certain corners of the tread blocks that are adjacent to the first grooves and that expose a tread block wall following the chamfer, relative to a rotation of the tire, to an off-road contact surface.

Abstract: An asymmetric tread for a snow tire comprising a rubber composition, comprising a tread surface intended to be in contact with the ground when the tire is running, and comprising a sequence of basic patterns arranged in the circumferential direction, each extending over at least 80% of the width (W) of the tread, each comprising a plurality of raised elements provided with sipes opening onto the tread surface, each sipe having a width of less than 1 mm and a depth of at least 3 mm. For each basic pattern, a sipes orientation level (NO) is defined that corresponds to ? i ? ? li * ? ? ? i ? P * Wm where i is the number of sipes in the pattern, li is the length of the ith sipe on the tread surface, P is the pitch of the basic pattern, Wm is the width of the basic pattern and ?i is the positive or negative angle formed on the tread surface by the ith sipe with the transverse direction, where |?i|?45 degrees, said orientation level being greater than or equal to 1.5 degrees/mm.

Abstract: A pneumatic tire whose steering stability on dry roads is improved with minimizing lowering of on-snow performances and which has round shoulders and comprises tread portion 2 divided by circumferential main grooves 3 and lateral grooves 4 into blocks 5 provided with sipes 6 each having zigzag part 8, the circumferential grooves 3 including at least a pair of axially outermost circumferential grooves 3o to divide the tread portion 2 into shoulder regions Ysh and crown region Ycr, wherein the zigzag part 8 of sipes 6sh disposed in the shoulder regions Ysh has a larger zigzag amplitude Wsh and a larger zigzag pitch Psh than zigzag amplitude Wcr and zigzag pitch Pcr of the zigzag part 8 of sipes 6cr disposed in the crown region Ycr, and angle ?sh of the sipes 6sh with respect to the axial direction is smaller than angle ?cr of the sipes 6cr with respect to the axial direction.

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: 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 non directional pneumatic tire is provided for an agricultural irrigation system. The tire includes first and second side walls and a radially outer wall defining an internal inflation chamber. A non directional tread pattern is defined on the tire and includes a plurality of longitudinal protrusions positioned substantially parallel to a rotational axis of the tire. The longitudinal protrusions are arranged in first and second rows extending from the first and second side walls toward and across the equatorial plane of the tire. The longitudinal protrusions of the first and second rows circumferentially alternate with each other and there is a circumferential spacing between adjacent longitudinal protrusions at the equatorial plane so that no portion of one longitudinal protrusion circumferentially coincides with or overlaps another.

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 motorcycle tire comprises a tread portion provided with first T-grooves and second T-grooves arranged and oriented alternately along the tire equator. The angles of the main portion and branch portion of the T-groove, with respect to the tire circumferential direction, are gradually increased toward the tread edges. The axial distances of the branching point and an inside end of the main portion are not more than 25% of the axial distance of the tread edge, each measured from the tire equator along the tread surface. The circumferential distance from the inside end of the main portion to the circumferentially adjacent T-groove is 5 to 15% of the circumferential pitch length of the first T-grooves.

Abstract: A motorcycle tire comprises a tread portion provided with a plurality of inner inclined grooves and inclined narrow grooves in both sides of a tire equator, wherein each inner inclined groove extends from an axially inner end to the outer end with an angle of 0-20 degrees with respect to a tire circumferential direction, the inner end of the inner inclined groove is located in a developed length within 5% of a tread half developed-width from the tire equator, each inner inclined groove has a circumferential length of 70-85% of a first pitch, each inclined narrow groove with a groove width of 0.5-2.0 mm is provided between circumferentially adjacent inner inclined grooves and has an angle with respect to a circumferential direction of the tire larger than that of the inner inclined groove.

Abstract: An unvulcanized rubber extruder that realizes extrusion forming of an unvulcanized rubber extrudate ensuring manufacturing of a high-quality tire without any increase of tire manufacturing steps. In the vicinity of left side end portion, in the drawing, of unvulcanized rubber (A) (rubber chafer part), unvulcanized rubber (B) flows along parallel wall (56) on the downside of main rubber flow channel (34) and flows along second inclined surface (38) on the upside of the main rubber flow channel (34). Simultaneously, apart from the main flow of the unvulcanized rubber (B), portion of the unvulcanized rubber (B) is extruded out in the direction perpendicular to auxiliary rubber flow channel (44) (arrow B direction). Accordingly, in the left side end portion, in the drawing, of unvulcanized rubber (A) (rubber chafer part), it appears that the upside and downside are shut in by the flow of the unvulcanized rubber (B).

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: A high performance rain tyre includes a tread band, having an inner portion and an outer portion as well as a central zone. There are formed in the tread band: two circumferential grooves in the inner portion, a central circumferential groove and a plurality of inner transverse grooves and a plurality of outer transverse grooves, wherein the inner transverse grooves include a central inner section which defines an angle with respect to the equatorial plane of between approximately ?95° and approximately ?135° and the outer transverse grooves include a central outer section which defines an angle, relative to the equatorial plane, of between approximately +125° and approximately +165°.

Abstract: A pneumatic tire has a tread surface is provided with a groove portion, and a land portion sectioned by the groove portion. In wall surfaces facing the groove portion in the land portion, an inside wall surface facing an inner side at a time of being installed to a vehicle is formed by a zigzag surface, and an outside wall surface facing an outer side at a time of being installed to the vehicle is formed by a flat surface.

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: The invention relates to an asymmetric tread for a tire comprising a plurality of basic patterns, for each of which there is defined a sipes density corresponding to ? i ? li P * Wm where i is the number of sipes in the pattern, li is the length of the ith sipe on the tread surface, P is the pitch of the basic pattern and Wm is the width of the basic pattern, a sipes orientation level corresponding to ? i ? ? li * ? ? ? i ? P * Wm , where ?i is the positive or negative angle formed on the tread surface by the ith sipe with the transverse direction and ?45 degrees and a steering pull criterion for the basic pattern corresponding to ? ? i ? li * ? ? ? i ? i ? ? li * ? ? ? i ? ? . The sipes density is greater than or equal to 60 ?m/mm2, the sipes orientation level is greater than or equal to 1.5 degrees/mm and the steering pull criterion for the pattern is less than or equal to 0.2.

Abstract: A motorcycle tire includes a tread portion having a first region and a second region divided by the tire equator, with the tread portion being provided with first inner inclined grooves provided in the first region and second inner inclined grooves provided in the second region, first and second inner inclined grooves alternately arranged in a tire circumferential direction, the inner inclined groove extending from an axially inner end Ai toward an anti-designated rolling direction to an axially outer end Ao at an angle ? of 0-20 to the tire circumferential direction, and first outer inclined grooves provided in the first region and second outer inclined grooves provided in the second region, and first and second outer inclined grooves alternately arranged in the tire circumferential direction, the outer inclined groove extending from an axially inner end Bi toward a designated rolling direction to an axially outer end Bo.

Abstract: A motorcycle tire improved in transient characteristics when leaned is disclosed, wherein the tread portion has a unidirectional tread pattern comprising: inside oblique main grooves disposed on each side of the tire equator staggeredly, inclined to the axially outside toward the intended rotational direction (R) at an angle of 5 to 30 degrees with respect to the circumferential direction, and each having an inner end (Ai) at a distance of 0 to 30% of the half tread width (W) from the tire equator; and outside oblique main grooves 11 disposed on each side of the tire equator staggeredly, inclined to the axially outside toward the counter-rotational direction at an angle of 10 to 60 degrees with respect to the circumferential direction, and each having an inner end (Bi) axially inside the outer end (Ao).

Abstract: A tire having (i) an asymmetric tread profile with a shoulder drop difference of 0.3 to 0.9; and (ii) an asymmetric tread pattern so as to have a ratio between the inner void/solid ratio and the outer void/solid ratio of 1.1 to 1.50. By the above combination of features, handling and aquaplaning performance is remarkably improved even at high operating speeds without negatively affecting the wear resistance of the tread band.

Abstract: A tread portion of a pneumatic ti re includes inner land portions between outer circumferential main grooves disposed most on tread ground-contact end sides and at least one inner circumferential main groove on the inner side thereof. The inner land portions are divided into inner blocks by inner lateral grooves inclined at an angle ? of 10 to 40°. The inner lateral grooves consist of first inner lateral grooves and second inner lateral grooves which are alternately arranged in a circumferential direction. The first inner lateral grooves include a wide-width part connecting to the outer circumferential main groove and a narrow-width part connecting to the inner circumferential main groove.

Abstract: An inclined groove (11) has a first inclined groove (101) and a second inclined groove (102). The first inclined groove (101) intersects a tire equator line (CL) and extends to one side (W1) outward in the tire width direction proceeding from the forward side (F) to the rearward side (B) in the rotation direction. The second inclined groove (102) intersects the tire equator line (CL) and the first inclined groove (101), and extends to the other side (W2) outward in the tire width direction proceeding from the forward side (F) in the rotation direction to the rearward side (B) in the rotation direction. The first inclined groove (101) and the second inclined groove (102) have forward side curved grooves (111), (121) located at the forward side (F) in the rotation direction, and rearward side curved grooves (112), (122) located at the rearward side (B) in the rotation direction.

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 with a designated installing direction to a vehicle, includes a tread portion with an inboard and an outboard tread edges, the tread portion provided with a pair of inboard and outboard center main grooves and a pair of inboard and outboard shoulder main grooves to form a center portion, a pair of middle portions, and a pair of shoulder portions, each of the inboard center main groove, the outboard center main groove and the inboard shoulder main groove having a groove width of from 10 to 20 mm, the outboard shoulder main groove having a groove width of from 2 to 5 mm, the outboard shoulder portion provided with outboard shoulder lateral grooves each extending from the outboard tread edge without reaching the outboard shoulder main groove, and the outboard middle portion provided with outboard middle lateral grooves.

Abstract: Heavy duty pneumatic tire with a tread portion having a zigzag crown main groove and a pair of zigzag shoulder main grooves forming two crown land portions between the crown main groove and two shoulder main grooves. The crown land portion is divided by crown lateral grooves into circumferentially arranged crown blocks. The crown lateral grooves in each crown land portion extend from alternate axially inside zigzag vertices of the shoulder main groove to zigzag vertices of the crown main groove, while inclining with respect to the tire circumferential direction. The crown block has a crown auxiliary groove narrower in width than the crown main groove and extending to one of the zigzag vertices of the crown main groove to which none of the crown lateral grooves are connected, from one of the inside zigzag vertices of the shoulder main groove, while inclining with respect to the tire axial direction.

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 with a left-right asymmetry tread pattern including inboard and outboard tread edges, a pair of inboard and outboard center main grooves to form a center portion therebetween, a pair of inboard and outboard shoulder main grooves to form a pair of middle portions and a pair of shoulder portions, inboard lateral main grooves extending from the inboard tread edge beyond the tire equator without reaching the outboard center main groove, inboard shoulder lateral grooves between adjacent inboard lateral main grooves, outboard shoulder lateral grooves extending from the axially outside of the outboard tread edge without reaching the outboard shoulder main groove, inboard middle lateral grooves between adjacent inboard lateral main grooves and extending from the inboard shoulder main groove without reaching the inboard center main groove, outboard middle lateral grooves and outboard middle sub lateral grooves.

Abstract: The present invention realizes a pneumatic tire for a motorcycle, in which durability in running straight at a relatively high speed and tread surface gripping properties during high-speed cornering are made compatible and, in particular, a pneumatic tire for a motorcycle, which tire is capable of demonstrating appropriate durability and driving stability in accordance with inputs even if these inputs differ between running straight, cornering left and cornering right. The tread portion 3 is constituted of plural types of rubbers 11-13 adjacent to each other in the tire widthwise direction and sectioned into at least a center region A at the center portion of the tire including the tire equatorial plane and two side regions B1, B2 at respective sides of the tire.

Abstract: A pneumatic tire includes circumferential main grooves extending in a tire circumferential direction and land portions partitioned and formed by the circumferential main grooves. The land portion of a center region and the land portions of left and right shoulder regions each have a plurality of sipes. Not less than 90% of the sipes disposed in the center region are constituted by two-dimensional sipes and not less than 90% of the sipes disposed in the shoulder regions are constituted by three-dimensional sipes. The left and right shoulder land portions each have a plurality of lug grooves arranged in the tire circumferential direction. A pitch number N_ce of the lug grooves in the land portion of the center region and a pitch number N_sh of the lug grooves in the land portions and of the left and right shoulder regions have a relationship such that N_ce>N_sh.

Abstract: A run-flat tire comprises a tread portion having a left-right asymmetry tread pattern including an inboard tread edge and an outboard tread edge defining a tread width therebetween, a circumferentially extending inner crown main groove disposed in an inner crown area being 20% width of the tread width from a tire equator toward the in-board tread edge, a plurality of inner lateral grooves extending from the inner crown main groove to the in-board tread edge, a plurality of inner blocks separated by the inner crown main groove, inner lateral grooves and the inboard tread edge, wherein each inner block is not provided with any circumferential grooves, or is provided with at least one narrow circumferential groove having a groove width of less than 2.0 mm.

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 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 novel design for a high-speed tire tread is provided that gives improved performance in both water and snow conditions. The tread region of the tire uses transversely-oriented grooves that each extend in a novel manner across the width of the tread region. There are no grooves or other tread features that provide substantial fluid communication between the transversely-oriented grooves.

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 pneumatic tire includes a tread portion including a plurality of land portions separated by at least two longitudinal grooves, a plurality of lateral grooves crossing the longitudinal groove to form a block row, at least one block having at least two sipes extending in an axial direction of the tire to divide at least three block-pieces which include an outer piece and an inner piece relatively arranged in circumferentially inner side of the block than the outer piece, wherein the total axial length of whole sipes is in a range of from 100 to 400 times a tread width, the outer piece of the block has a circumferential length larger than that of the inner piece of the block, and a ratio of the circumferential length of the outer piece to the circumferential length of the inner piece is greater than 1.0 and smaller than 3.0.

Abstract: Sipe groups including a plurality of sipes which is opened to a main groove and is arranged at intervals in a tire circumferential direction are formed in both land parts with the main groove being interposed therebetween. The sipe groups are arranged at intervals in the tire circumferential direction, and are shifted in the tire circumferential direction on both sides of the main groove.

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 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 method of estimating the available grip margin of a tire of a vehicle rolling on a ground involves: estimating a quantity Rslip ca, i.e., the ratio of the slip contact area and the total contact area of the tire on the ground; determining, in a signal processing unit, the grip potential used P?,used and/or the available grip margin of the tire P?,avail from the quantity and pre-established data corresponding to the type of the tire, where P?,avail=1?P?,used; and recording in a memory the grip potential used and/or the available grip margin of the tire.

Abstract: A pneumatic tire comprising a carcass and a tread located radially outward of the carcass and extending between the tire sidewalls is disclosed. The tread provides a tread running surface and comprises a first, radially outer tread layer comprising a first rubber compound and a second, radially inner tread layer comprising a second rubber compound, wherein the second tread layer is located radially adjacent to the first tread layer, and wherein the first rubber compound is different from the second rubber compound. The second tread layer comprises a plurality of integrally formed extensions of the second tread layer extending from the second tread layer radially outwardly to the tread running surface. The first rubber compound and the second rubber compound each comprise at least at least 30 parts per hundred parts of rubber (phr) of silica. Each of the extensions has a width as measured in the axial direction of the tire in a range of from 1 to 15 mm.

Abstract: A pneumatic tire including a tread portion, side wall portions, and bead portions, wherein the tread portion includes a plurality of circumferential grooves having a groove width of not less than 3.0 mm and which extend in a tire circumferential direction while meandering, and a plurality of lateral grooves having a groove width of not less than 3.0 mm and which communicate between a pair of circumferential grooves adjacent in a tire width direction. The circumferential grooves and the lateral grooves partition two rows of polygonal blocks formed by arranging a plurality of polygonal blocks, having a polygonal shape with not less than five corners, in a staggered manner along the tire circumferential direction. A polygonal rib extending in the tire circumferential direction is disposed between the two rows of polygonal blocks. The polygonal rib is adjacent to the two rows of polygonal blocks.

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: Provided is a pneumatic tire in which a polygonal block group is provided between two circumferential main grooves in a tread ground contact width, the polygonal block group comprising a plurality of polygonal blocks with five or more sides which are demarcated by thin grooves and arranged in at least two longitudinal rows and a plurality of lateral rows, the longitudinal rows being arranged so that the polygonal blocks included in adjacent longitudinal rows differ in phase from each other in a tire circumferential direction; side block rows are provided, one on each of the two sides in the tire width direction of the polygonal block group, the side block rows comprising a plurality of side blocks which are demarcated by the circumferential main grooves, lateral grooves, and the thin grooves and arranged in the tire circumferential direction; and a length in the tire circumferential direction of a first side block included in a first side block row provided on one side is larger than the length in the tire ci

Abstract: A pneumatic tire includes two circumferential main grooves within a ground-contact width of a tread, and a group of polygonal blocks between the two circumferential main grooves. The group of polygonal blocks includes a plurality of polygonal blocks arranged in at least two longitudinal rows in a tire circumferential direction and a plurality of transverse rows in a tire width direction. Each polygonal block has not less than five sides, and is defined by narrow grooves. The polygonal blocks in the adjacent longitudinal rows are arranged so as to be staggered from each other in the tire circumferential direction. The group of polygonal blocks has a widthwise center that is positioned within a 50% width region of the ground-contact width of the tread across a tire equatorial plane.