Abstract: A tread pattern of a pneumatic tire includes three or more circumferential main grooves extending in a tire circumferential direction, a plurality of lug grooves provided in a land portion defined by two circumferential main grooves, and a sipe provided between adjacent lug grooves. The sipe is a composite sipe having a two-dimensional portion and a three-dimensional portion. Among open ends on both sides of the lug groove, an open end on an identical side to an end portion of the sipe at which the two-dimensional portion is provided is provided with a raised bottom portion.

Abstract: In a pneumatic tire, a land portion includes a chamfered portion formed on an edge portion of the land portion on a ground contact edge side, and a lug groove and a narrow groove disposed correspondingly to the chamfered portion. The chamfered portion is formed on the edge portion on a ground contact edge side, and has a chamfered width that increases toward a circumferential direction in the road contact surface of the land portion. The lug groove terminates in the land portion on one end, and is opened to a central portion of the chamfered portion in a longitudinal direction on the other end. The narrow groove is opened to an edge portion of the land portion on an equatorial plane side on one end, and terminates in the vicinity of a maximum width position of the chamfered portion on the other end.

Abstract: Provided is a pneumatic tire. A tread portion includes a plurality of longitudinal grooves extending in the tire circumferential direction, a plurality of lateral grooves extending in a tire lateral direction, and a plurality of blocks defined by the longitudinal grooves and the lateral grooves. Notch portions are formed in portions of a freely-selected pair of blocks adjacent to each other across a longitudinal groove, the portions facing the longitudinal groove. The notch portions face with each other across the longitudinal groove. Each of the notch portions has a notch width and a notch depth larger on a center side in an extension direction of the longitudinal groove than on an outer side in the extension direction of the longitudinal groove.

Abstract: In a pneumatic tire, a tread comprises a plurality of main grooves including a first main groove that extends in straight fashion in a tire circumferential direction, and at least one first recess that is recessed toward a first side in a tire axial direction from the first main groove and that is arranged at a portion in the tire circumferential direction of the first main groove, and the at least one first recess comprises a first recess side face that is planar and that extends toward an interior in a tire radial direction from the tread surface, and a first recess bottom that is planar and that extends toward the first side in the tire axial direction from the first main groove so as to intersect the first recess side face.

Abstract: As viewed in a tire circumferential direction, a maximum value of an amount by which a first inner portion protrudes toward the exterior in a tire width direction beyond a second inner portion is greater than a maximum value of an amount by which the second inner portion protrudes toward the exterior in the tire width direction beyond a first inner portion, and as viewed in the tire circumferential direction, a maximum value of an amount by which a second outer portion protrudes toward the exterior in the tire width direction beyond a first outer portion is greater than a maximum value of an amount by which the first outer portion protrudes toward the exterior in the tire width direction beyond the second outer portion.

Abstract: A tread pattern of a pneumatic tire includes circumferential main grooves, a land portion defined by the circumferential main grooves in the lateral direction, and sipes at intervals in a circumferential direction, the sipes connecting the circumferential main grooves with each other. Each of the sipes has a peak-like shape protruding to a first side in the circumferential direction. When, in a profile cross-section of the tread portion taken along the lateral direction, an arc passing through two land portion edge points at which a tread surface of the land portion is connected with groove wall surfaces of the circumferential main grooves and having a center point positioned on the equator line is set to a standard profile line, a profile line formed by the tread surface of the land portion is a swelling profile line protruding outward of the standard profile line in a radial direction.

Abstract: A vehicle for traversing an area with a minimal environmental impact is described. The vehicle includes a first component that creates a first environmental impact when the vehicle is traversing in the area. The vehicle further includes a second component configured to reduce the first environmental impact.

Abstract: A tire includes a narrow shallow grooved region on a land portion defined by a circumferential main groove. The narrow shallow grooved region includes a plurality of narrow shallow grooves that are not open to the circumferential main groove. A ratio of a total area of the narrow shallow grooved region to a ground contact area of the land portion is not less than 0.05 and not greater than 0.60.

Abstract: The subject invention discloses a tire (1) having at least one sipe pattern comprising, in the circumferential direction of the tire (1), one or more straight sipes (15) and two or more inclined sipes (17, 19, 37, 39); wherein at least one straight sipe (15) is arranged between two or more inclined sipes (17, 19, 37, 39).

Abstract: A tyre includes a tread portion including a tyre equator, a tread edge, a tread width which is a distance in a tyre axial direction from the tyre equator to the tread edge, a shoulder land portion including the tread edge. The shoulder land portion is provided with a plurality of first shoulder lateral grooves. Each first shoulder lateral groove includes an inner groove portion extending inwardly in the tyre axial direction of the tread edge and an outer groove portion extending outwardly in the tyre axial direction of the tread edge. Each first shoulder lateral groove, in a tread development view, has a groove area Sb of the outer groove portion extending in a region from the tread edge to an 125% position of the tread width is greater than a groove area Sa of the inner groove portion.

Abstract: A tire includes a tread portion including a pair of shoulder main grooves, a crown region defined between the pair of the shoulder main grooves, and a pair of shoulder regions arranged on both outer sides of the pair of the shoulder main grooves. A land ratio of the crown region is 50% or more and 70% or less. A land ratio of the shoulder regions is 50% or more and 70% or less. The land ratio of the crown region is larger than the land ratio of the shoulder regions.

Abstract: A pneumatic tyre includes a tread portion including a shoulder land portion having a tread edge. The shoulder land portion is provided with shoulder lateral grooves extending inwardly in a tyre axial direction from the tread edge so as to define shoulder block elements therebetween, and at least one protrusion protruding from an outer surface in the tyre axial direction of the respective shoulder land portion. The protrusion includes first portions provided on the respective shoulder block elements and extending in a tyre radial direction, and a second portion located inwardly in the tyre radial direction of one of the shoulder lateral grooves and extending in a tyre circumferential direction to connect inner portions of at least two first portions.

Abstract: A tire includes a tread portion. The tread portion includes a pair of shoulder main grooves and a plurality of crown blocks. Each of the crown blocks includes a ground contacting surface, a chamfered portion arranged so as to surround the entire circumference of the ground contacting surface, and a main body portion arranged inside the chamfered portion in a tire radial direction. The main body portion is provided with at least one step-shaped portion that is bent stepwise in a transverse cross section orthogonal to the ground contacting surface.

Abstract: A tyre includes a tread portion including first and second land portions. The first middle land portion is provided with first middle lateral grooves traversing the first middle land portion completely. The second middle land portion is provided with second middle lateral grooves traversing the second middle land portion completely. Each of the first middle lateral grooves and the second middle lateral grooves is a curved groove which includes a first convex portion located on a first side with respect to a groove-reference-straight-line that connects both ends of a groove centerline of the curved groove and a second convex portion located on a second side with respect to the groove-reference-straight-line, and a circumferential length of the groove-reference-straight-line of each first middle lateral groove is smaller than a circumferential length of the groove-reference-straight-line of each second middle lateral groove.

Abstract: It is provided a pneumatic tyre, the tyre having a circumferential direction, an axial direction and an equatorial plane, and the tyre comprising: a tread extending in a tyre circumferential direction, said tread comprising at least one circumferential groove running continuously in the circumferential direction, and a plurality of axial grooves or transverse grooves running at an angle to the axial direction, and a plurality of blocks defined by the circumferential groove and the axial grooves or transverse grooves, said blocks extending radially between an inner surface of the tread and a tread surface to come into contact with the ground, wherein at least some of the blocks comprise at least one wavy groove that extends from a circumferential groove inwardly into the block, and wherein the wavy groove has a depth extending radially from the tread surface to come into contact with the ground towards the inner surface that ends above the inner surface (26) of the tread.

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

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

Abstract: A tire can include a block having a recess. The recess can include a first opening on a tread side and a second opening on a side wall face side. The first opening can include a pair of first edges extending from a first vertex to the side wall face side so as to form a V-shaped edge on the tread. The second opening can include a pair of second edges that can extend from a second vertex on the side wall face, and can be connected to the pair of first edges at intersection points. One of the pair of second edges can include a second edge body that can extend on a straight line from the second vertex to the intersection point, and a second edge subsidiary portion that can be bent so as to widen the second opening.

Abstract: In a pneumatic tire, a groove depth H1 of each of first and second inclined lug grooves over an entire region from an opening portion to a corresponding one of first or second circumferential main grooves to a terminating end portion within a center land portion has a relationship with a maximum groove depth Hg of the corresponding one of the first or second circumferential main grooves represented by 0.80?H1/Hg?1.00. Additionally, a maximum groove depth H2 of each of first and second lateral grooves has a relationship with a groove depth H1e at a terminating end portion of the corresponding one of the first and second inclined lug grooves represented by 0.70?H2/H1e?0.90.

Abstract: A tire having a tread portion that is provided with sipes. Four sipe segments of the sipe include a first sipe segment, a second sipe segment, a third sipe segment, and a fourth sipe segment. At least one of the first sipe segment and the third sipe segment includes, in the cross section orthogonal to the length direction, an oscillated portion which extends in the tire radial direction, while oscillating in the lateral direction orthogonal to the length direction.

Abstract: In a pneumatic tire having a point-symmetric structure block pattern, narrow and wide outer blocks having different outer end positions in the lateral direction are alternately arranged in the circumferential direction. Among side blocks provided in a side region, large and small blocks are disposed respectively on the outer sides of the narrow and wide outer blocks in the lateral direction. The lateral and side grooves are continuous such that the groove width of the side groove connected to the wide portion of the lateral groove where the outer block converges toward the inner side in the radial direction, and the groove width of the side portion connected to the narrow portion of the lateral groove where the outer block widens toward the inner side in the radial direction, and the side block is tapered with an inner portion block width in the radial direction converges toward the wide portion.

Abstract: A pneumatic tire includes a block formed by a main groove extending in a tire circumferential direction and a lateral groove extending in a tire width direction. The block includes a first inclined surface provided at a corner portion between a first side surface and a top surface, the first inclined surface extending obliquely toward a groove bottom of the main groove or the lateral groove defined by the first side surface, and a first narrow groove extending from a center of the block toward the first side surface, an outer end of the first narrow groove being located on the first inclined surface, the first narrow groove being smaller in groove width than the main groove and the lateral groove.

Abstract: A tire comprises a tread portion comprising three main grooves and four land portions. The main grooves are a first shoulder main groove, a second shoulder main groove and a crown main groove. The land portions include a first middle land portion between the first shoulder main groove and the crown main groove, a second middle land portion between the second shoulder main groove and the crown main groove. The first middle land portion is disposed so that the tire equator is positioned in the ground contact surface thereof. Each of the first middle land portion and the second middle land portion is provided with a plurality of narrow grooves so as to exhibit excellent steering stability and ride comfort.

Abstract: Provided is a tire capable of efficiently discharging water, which is additionally absorbed through a plurality of flow tubes, through the flow tubes and a drain tube, thereby improving wet grip performance. The tire with enhanced wet grip includes a kerf formed on a block to discharge water introduced thereinto to a groove, a drain tube formed in the kerf in its longitudinal direction and connected to the groove to discharge the water to the groove, and a flow tube formed in the kerf toward the drain tube from an inlet of the kerf, into which the water is introduced, and connected to the groove or the drain tube.

Abstract: The present invention provides a pneumatic tire having excellent traction performance and excellent non-uniform wear resistance. In the pneumatic tire, a plurality of blocks are formed by a plurality of main grooves extending in a tire circumferential direction and a plurality of transverse grooves extending in a tire width direction. A first block and a second block disposed adjacently to each other in the tire circumferential direction are formed as one set, and a surface area of the second block is set larger than a surface area of the first block. The second block is arranged so as to be displaced a position of the second block from a position of the first block toward the inside in the tire width direction.

Abstract: In the pneumatic tire, the blocks above the circumferential reinforcing layer have at least one sipe. Also, the sipe has a bent shape, in a plan view, with two flex points P1, P2, and has a closed structure with two end points Q1, Q2 terminating within the block. Also, the angle ? between the line that connects the flex points P1, P2 and the tire circumferential direction is within the range such that 0°???10°. Also, the angle ?1 between the line connecting the flex point P1 and the end point Q1 and the tire circumferential direction, and the angle ?2 between the line connecting the flex point P2 and the end point Q2 and the tire circumferential direction are within the range such that 35°??1?55° and 35°??2?55°.

Abstract: A heavy duty pneumatic tire comprises a tread portion provided with circumferentially continuous main grooves and lateral grooves to form blocks in circumferential rows. The main grooves include a pair of shoulder main grooves disposed one on each side of the tire equator so that the center line thereof is at a distance of 0.30 to 0.65 times one half of the tread width from the tire equator. The blocks include crown blocks disposed in a tread crown region between the shoulder main grooves, and shoulder blocks disposed in shoulder regions axially outside the shoulder main grooves. Each of the crown blocks and shoulder blocks is provided with at least one axially extending sipe.

Abstract: A tire (1) for a motorcycle has: a groove portion (10) formed at a tread; and a block-shaped land portion (100) protrusive from the groove portion (10) toward an outside in a tire radial direction (TD). The land portion (100) has a plate-shaped small piece portion (107). Since an area with which the running wind comes into contact increases due to the small piece portion (107), the periphery of the groove portion (10) or the land portion (100) can be effectively thermally radiated. Thus, a temperature of the land portion (100) can be reduced, and even if the automatic motorcycle runs on the hard road surface over a predetermined period of time or more, it is possible to effectively restrain the lowering of required performance such as gripping force, feeling of grounding, and steering stability, which is exerted by the lowering of the rigidity of the land portion.

Abstract: Provided is a pneumatic tire having further improved ice performance achieved by narrow grooves. The pneumatic tire of the present invention is provided, in a tread, with land sections formed by partitioning the tread by grooves, and each of the land sections is provide with narrow grooves in a ground contact surface of the land section. The angle of tilt of the narrow grooves relative to the tire's circumferential direction is set to be larger in end regions located at both sides of a center region in a tire's lateral direction in each of the land sections than in the center region.

Abstract: Tire tread for civil engineering works vehicle, this tread having a tread surface (10) intended to come into contact with the ground, this tread comprising a central part (21) delimited by grooves (3) of circumferential overall orientation, these grooves delimiting lateral parts (22) axially towards the outside of the central part (21), each lateral part (22) being provided with a plurality of transverse grooves (6) delimiting a plurality of blocks (7), the transverse grooves (6) having a cross section of minimum area (ST) and being distributed substantially uniformly in the circumferential direction, this tread being characterized in that the central part (21) is provided with a plurality of channels (51) extending transversely under the tread surface (10) and passing right through the said central part (21), each channel (51) comprising a first and a second end (52, 51), these first and second ends opening into the grooves (3) of circumferential overall orientation, at least one end of each channel opening

Abstract: A motorcycle tire for running on rough terrain comprises a tread portion having a unidirectional tread pattern and provided with T-sided blocks having a top surface, a heel-side sidewall surface extending from a heel-side edge of the top surface, and a toe-side sidewall surface extending from a toe-side edge of the top surface. The heel-side sidewall surface has an inclination angle ? of from 0 to 15 degrees. The toe-side sidewall surface has a radially outer region having a height of from 20 to 55% of the block height and inclined at an angle ? of from 20 to 45 degrees. A radially inner region of the toe-side sidewall surface has: a central part inclined at the same angle ? as the radially outer region; a pair of lateral parts located one on each side of the central part and having an inclination angle ? of from 0 to 15 degrees; and a pair of stepped parts extending between the lateral parts and the central part in a direction crosswise to the toe-side edge.

Abstract: A pneumatic tire comprises a tread portion provided along each tread edge with shoulder blocks defined by a circumferentially extending shoulder main groove and shoulder lateral grooves extending from the shoulder main groove to the tread edge. The shoulder main groove is made up of groove segments curved convexly toward the tire equator so that each groove segment comprises a first inclined part and a second inclined part. The shoulder lateral grooves extend at 45 to 90 degrees with respect to the tire circumferential direction, and are coupled with the first inclined parts of the groove segments. The shoulder blocks are each subdivided by a shoulder sub groove extending at an angle of from 15 to 45 degrees with respect to the tire circumferential direction. The shoulder sub groove has an axially outer end connected with the shoulder lateral groove and an axially inner end coupled with the second inclined part.

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: Tread band for a tire having a tread surface and comprising a plurality of recesses of total depth H* opening onto the tread surface, each recess comprising at least two cavities of a first type of cavities, each of these cavities of a first type being delimited by a main wall and having a depth Hi, the main wall of each cavity of the first type is such that its intersection with a virtual surface parallel to the running surface in the new condition and passing through the points of the said wall that are furthest towards the outside of the tread forms an exterior contour that is closed and of length Ce, the main wall of each cavity of the first type is such that its intersection with a virtual surface parallel to the running surface in the new condition and passing through the points of the main wall furthest towards the inside of the tread forms an interior contour which is closed and of length of length Ci, this tread band being characterized in that the cavities of a first type are arranged at different l

Abstract: Disclosed is a pneumatic tire for motorcycle wherein edge effect can be achieved without changing the design of block pattern, and stability of steering such as grip, feeling of grounding, or controllability of slip is enhanced. When a block having a recess in which a protrusion is formed on the bottom is provided in a tread, edge component increases correspondingly as compared with a block provided only with a recess (having no protrusion), and thereby traction can be enhanced. Since it is not required to increase the hardness of rubber of the read nor to enlarge the block size, feeling of grounding is ensured and controllability of slip can be ensured in a muddy place or on a soft road surface.

Abstract: A motorcycle tire for running on rough terrain comprises a tread portion provided with shoulder blocks each provided with a ground contacting surface whose profile (contour) is a curved line having a radius of curvature not less than 200 mm or a straight line in a tire meridian section including the centroid of the ground contacting surface.

Abstract: Provided is a tire exhibiting improved wear resistance, partial wear resistance, and traction performance on the wet road surface. The tire has block land portion arrays 5 defined on a tread portion 1. Between two block land portion arrays 5 located adjacent to each other while sandwiching a circumferential groove 2, a block land portions 4 constituting the block land portion arrays are arrange so as to be positionally displaced from each other, and a groove portion 6 located between the block land portions adjacent in the tire width direction extends obliquely with respect to tire width direction and the tire circumferential direction. At this time, a distance d2 between the block land portions adjacent in the tire width direction is shorter than a distance d1 between the block land portions adjacent in the circumferential direction.

Abstract: A studless tire improved in on-ice performance as well as on-snow performance is disclosed. The tread portion is provided with tread grooves to have a land ratio in a range of from 0.65 to 0.75. The tread grooves including an axially inner circumferential groove, an axially outer circumferential groove and a plurality of sipes disposed on each side of the tire equator. The land ratio of a crown region and the land ratio of a shoulder region are each larger than the land ratio of a middle region, wherein the crown region is defined between the widthwise center lines of the inner circumferential grooves, the middle region is defined between the widthwise center line of the axially inner circumferential groove and the widthwise center line of the axially outer circumferential groove, and the shoulder region is defined between the widthwise center line of the outer circumferential groove and a tread edge of the tread portion.

Abstract: An object the present invention is to provide a tire, in which wear resistance has been enhanced by optimizing the shape and location of block land portions. The tire has plural rows 5 of block land portions 4 formed by demarcation by providing plural circumferential grooves 2 extending along tire circumferential direction and plural lateral grooves 3 for communicating adjacent two circumferential grooves 2,2 with each other; in at least two rows 5 of block land portions adjacent to each other with a circumferential groove therebetween, among the rows 5 of block land portions 4, the respective rows 5 of block land portions 4 are disposed to be offset with respect to each other in the tire circumferential direction. The extending direction of the groove portion 6 between the block land portions adjacent to each other in the tire widthwise direction is inclined with respect to the tire widthwise direction and tire circumferential direction.

Abstract: A pneumatic tire is provided in the tread portion with zigzag circumferential grooves and axial grooves so that a row of circumferentially arranged blocks is formed on each side of each of the zigzag circumferential grooves. Each of the zigzag circumferential grooves is composed of axially inner and outer circumferential segments and oblique segments. The axially inner and outer circumferential segments are arranged alternately in the tire circumferential direction. The oblique segments connect between the axially inner and outer circumferential segments, whereby the zigzag circumferential groove extends in the form of a trapezoidal wave. The zigzag amplitude is in a range of from 4 to 15% of a half tread width (Tw/2). The width of the zigzag circumferential groove is in a range of from 7 to 13% of the half tread width (Tw/2). The number of the axial grooves connected to each of the zigzag circumferential grooves on both side thereof is in a range of from 8 to 12 when counted in a tire footprint.

Abstract: The invention provides a pneumatic tire which can increase a driving performance on a road surface of a so-called sherbet snow, and in which a biased wear such as a toe-and-heel wear or the like is hard to be generated. In a pneumatic tire provided with a tread pattern having a transverse groove 2b formed between a plurality of blocks 1b, the transverse groove 2b is provided with a top side groove portion 11 extending while a groove width GW expands to a tread end side, and a bottom side groove portion 12 extending with a roughly fixed groove width GW.

Abstract: In a tread part, a land part (block) partitioned by a main transverse groove is provided with a thin groove having a narrower groove width than the main transverse groove and extending in a tire width direction. On a groove lateral face which is one of opposing groove lateral faces of the thin groove, ridges projecting toward the other groove lateral face and extending in a depth direction of the thin groove are provided. A plural number of the ridges are provided in parallel to each other at intervals in a length direction of the thin groove, and an extending length in the depth direction is set up to include at least two kinds.

Abstract: A tire, wherein, a lateral groove (7) is disposed between a predetermined land block (5) and a land block (6) adjacent to the land block (5) in the tire circumference direction, among land blocks (4, 5, 6), and is formed of an inner lateral groove (Q) and an outer lateral groove (P), the inside lateral groove (Q) being disposed at an inside of a boundary of a bent portion (12) in a tire width direction, the outside lateral groove (P) being disposed at an outside of the bent portion (12), the bent portion (12) being formed at intermediate portion in the tire width direction. The angle ?1 of the inner lateral groove (Q) relative to the tire circumference direction is smaller than the angle ?2 of the outer lateral groove (P) relative to the circumference direction.

Abstract: A pneumatic tire 1 according to the present invention comprises a plurality of land blocks 10-14 defined by circumferential grooves 2-5 extending in a tire circumferential direction and lateral grooves 6 extending in a tread width direction, wherein a stepped portion 10a-14b extending in the tread width direction is provided at at least one of circumferential edges of each of the land blocks 10-14. The stepped portion 10a-14b is formed to have the same width dimension as a width of the land block. A height of the stepped portion 10a-14b is the smallest for the land block 12 closest to a tire equator line CL and becomes gradually larger toward an outer side in the tread width direction. A maximum height of the stepped portion 10a-14b is smaller than a height of a tread surface Tr of the land block 10-14.

Abstract: A heavy duty tire comprises a tread portion provided with a central circumferential groove, a crown circumferential groove on each side thereof and crown axial grooves extending therebetween so as to for crown blocks. The crown block is circumferentially subdivides into two block pieces by a crown narrow groove. The crown axial groove is provided in the groove bottom with a tie bar rising therefrom and connecting the circumferentially adjacent two crown blocks each other. The crown axial grooves are inclined at an angle ? of from 10 to 30 degrees with respect to the tire axial direction. The central circumferential groove and an axially inner part of the crown axial groove which part is axially inside the tie bar, are shallower than the crown circumferential groove.

Abstract: To significantly improve performances on ice by optimizing a tread pattern. This pneumatic tire has, in at least a part of a tread portion 1, a block group GB formed by arranging blocks 3 close to each other, the blocks being defined by grooves 2 and being independent of each other, and when a symbol P (mm) stands for a reference pitch length of the blocks in the block group GB, a symbol W (mm) stands for a width of the block group GB, a symbol a (pieces) stands for the number of the blocks 3 existing in a reference zone Z of the block group GB, the reference zone being comparted by the reference pitch length P and the width W, and a symbol N (%) stands for a negative ratio in the reference zone Z, a block number density S, which is the number of the blocks per unit of an actual ground contact area of the block group GB and given by a formula of S=a/{P×W×(1?N/100)}, is set within a range of not less than 0.003 (pieces/mm2) but not more than 0.04 (pieces/mm2).

Abstract: To enhance cornering performance on each road surface and improve steering stability while ensuring traction performance and breaking performance of a pneumatic tire on a snow road or off-road. A shoulder land row (31) between a main groove (11) extending in the tire peripheral direction of a tread unit (2) and a tread end (TE) is partitioned into plan-view trapezoidal blocks (31B) with their widths reducing toward the outer side of a tire width direction by shoulder lug grooves (26) in an almost tire width direction. A plan-view trapezoidal notch (40) with its width reducing toward the inside of a block (31B) is formed in almost the center of the main groove (11) side edge of a block (31B), and an inclined surface (41) extending from the surface of the block (31B) toward the bottom of the main groove (11) is formed in the notch (40) integrally with the block (31B). This inclined surface (41) is formed stepwise by a plurality of recessed curved surfaces and protruding ridges formed between them.

Abstract: The present invention has an object to provide a pneumatic tire having a sipe, which can increase ice braking performance without reducing anti-wear performance. The pneumatic tire includes: a plurality of land portions 4 partitioned by grooves 2 and 3 and formed in a tread surface 1a; and at least one sipe 5 formed in each of the land portions 4, wherein the sipe 5 is formed so that sipe inner wall surfaces 6 and 6 are formed perpendicularly to the tread surface 1a, one or more recesses 7 exposed on the tread surface 1a are formed in at least one of the sipe inner wall surfaces 6 and 6 opposed to each other, the recess 7 has a sectional area gradually decreasing from an opening end of the sipe 5 toward a sipe bottom 8 and converges on the sipe inner wall surface 6 before reaching the sipe bottom 8.

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