Abstract: The present invention relates to a three-layered metal cable of construction L+M+N usable as a reinforcing element for a tire carcass reinforcement, comprising an inner layer C1 having L wires of diameter d1 with L being from 1 to 4, surrounded by an intermediate layer C2 of M wires of diameter d2 wound together in a helix at a pitch p2 with M being from 3 to 12, said layer C2 being surrounded by an outer layer C3 of N wires of diameter d3 wound together in a helix at a pitch p3 with N being from 8 to 20, said cable being characterised in that a sheath formed of a cross-linkable or cross-linked rubber composition based on at least one diene elastomer covers at least said layer C2. The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to tires used in industrial vehicles, more particularly heavy-vehicle tires and their carcass reinforcement plies.

Abstract: The present invention relates to a three-layered metal cable of construction L+M+N usable as a reinforcing element for a tire carcass reinforcement, comprising an inner layer C1 having L wires of diameter d1 with L being from 1 to 4, surrounded by an intermediate layer C2 of M wires of diameter d2 wound together in a helix at a pitch p2 with M being from 3 to 12, said layer C2 being surrounded by an outer layer C3 of N wires of diameter d3 wound together in a helix at a pitch p3 with N being from 8 to 20, said cable being characterised in that a sheath formed of a cross-linkable or cross-linked rubber composition based on at least one diene elastomer covers at least said layer C2. The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to tires used in industrial vehicles, more particularly heavy-vehicle tires and their carcass reinforcement plies.

Abstract: The present invention relates to a method of increasing the high-speed performance of a carcass structure in a tyre for vehicle wheels. The method includes: preparing at least one hybrid yarn (13) and assembling a carcass structure (2) comprising at least one carcass ply (3a, 3b) substantially built on cords (12) comprising the hybrid yarn (13). The hybrid yarn (13) comprises a plurality of filaments (14a, 15a) obtained from a first multi-filament yarn (14) of polyester and a second multi-filament yarn (15) having a decay of the modulus with the temperature lower than 20%. Each of the first multi-filament yarn (14) and second multi-filament yarn (15) comprises a plurality of individual filaments (14a, 15a). The individual filaments (14a) of the first multi-filament yarn (14) are at least partly mixed in proportions of at least 50% with the individual filaments (15a) of said second multi-filament yarn (15).

Abstract: Provided is a pneumatic tire whose safety factor and durability are improved without generating a problem of an increase in the weight of a tire and an increase in the inner surface cord protrusion failure. Provided is a pneumatic tire including one or more carcasses 2 extending toroidally between bead cores 1 embedded in a pair of bead portions 11 respectively. A polyester fiber cord whose total decitex as a twisted cord is 4300 to 5100 dtex, whose cord strength as a dip treated cord is 6.5 to 7.2 cN/dtex and whose cord elongation at a stress loading of 2 cN/dtex is 3.5 to 4.0% is used as a reinforcing cord of the carcass 2, and the tenacity of a treat which is the reinforcing cord covered with rubber per unit width is 2.9 to 3.2 kN/cm.

Abstract: Metal cord with three layers (C1+C2+C3) of 3+M+N construction, rubberized in situ, comprising a first layer or central layer (C1) comprised of three wires of diameter d1 assembled in a helix at a pitch p1, around which central layer there are wound in a helix at a pitch p2, in a second layer (C2), M wires of diameter d2, around which second layer there are wound in a helix at a pitch p3, in a third layer (C3), N wires of diameter d3. The cord has the following characteristics (d1, d2, d3, p1, p2 and p3 being expressed in mm): 0.08?d1?0.50; 0.08?d2?0.50; 0.08?d3?0.50; 3<p1<50; 6<p2<50; 9<p3<50; over any 3 cm length of cord.

Abstract: A composite hybrid cord comprising a core comprising of a first bundle of synthetic filaments having a filament tenacity of from 10 to 40 grams per decitex and a plurality of cabled strands helically wound around the core, each cabled strand comprising of a plurality of metal strands helically wound around a center second bundle of synthetic filaments that have a filament tenacity of from 10 to 40 grams per decitex. The ratio of the largest cross sectional dimension of the first bundle of synthetic filaments to the largest cross sectional dimension of the second bundle of synthetic filaments is from 1.5:1 to 20:1. The metallic filaments of the cabled strands have an elongation at break that is no more than 24 percent different from the elongation at break of the synthetic filaments of the first and second bundles.

Abstract: Metal cord with three layers (C1+C2+C3) of 2+M+N construction, rubberized in situ, comprising a first layer or central layer (C1) comprised of two wires (10) of diameter d1 assembled in a helix at a pitch p1, around which central layer there are wound in a helix at a pitch p2, in a second layer (C2), M wires (11) of diameter d2, around which second layer there are wound in a helix at a pitch p3, in a third layer (C3), N wires (12) of diameter d3, the said cord being characterized in that it has the following characteristics (d1, d2, d3, p1, p2 and p3 being expressed in mm): 0.08?d1?0.50; 0.08?d2?0.50; 0.08?d3?0.

Abstract: This invention provides a pneumatic tire provided with a carcass (4) comprised of one or more carcass plies formed by covering plural reinforcing cords arranged in parallel with a coating rubber and a pair of side reinforcing rubber layers (5) each having a crescent shape in section and disposed at an inside of the carcass, wherein ride comfort during usual running and durability during run-flat running are improved by applying a cord including a polyketone fiber and satisfying conditions of equation (I): ???0.01×E+1.2 and equation (II): ??0.02 [wherein ? is a heat shrinkage stress (cN/dtex) at 177° C. and E is an elastic modulus (cN/dtex) at 25° C. under a load of 49 N] to the reinforcing cord and a rubber composition having a loss tangent (tan ?) at 25° C. and 1% strain of less than 0.12 and a viscosity (G?) at 130° C. during unvulcanization of not less than 50 MPa to the coating rubber.

Abstract: The invention provides a radial tire, in which a single rubber coated cord (C1) is used to form a carcass layer (1) without generating any material jointed portion and which is favorable in weight balance, external appearance, and quality and excellent in productivity, the carcass layer (1) is formed from at least one cord row layer (11A) formed by cutting a rubber coated cord (C1), which is formed to make an external shape of a cross section elliptical, one by one, to align and bond the same in a tire circumference direction, and the cord row layer is jointed only in a single location on a tire circumference to generate little overlap.

Abstract: Metal cord (C-1) with three layers (C1, C2, C3), which is rubberized in situ, comprising a core or first layer (10, C1) of diameter d1, around which there are wound together in a helix at a pitch p2, in a second layer (C2), N wires (11) of diameter d2, N varying from 5 to 7, around which there are wound together in a helix at a pitch p3, in a third layer (C3), P wires (12) of diameter d3, the said cord being characterized in that it has the following characteristics (d1, d2, d3, p2 and p3 being expressed in mm): 0.08?d1?0.40; 0.08?d2?0.35; 0.08?d3?0.35; 5?(d1+d2)<p2?p3<10?(d1+2d2+d3); over any 2 cm length of cord, a rubber composition called “filling rubber” (13) is present in each of the capillaries (14) lying on the one hand between the core (C1) and the N wires of the second layer (C2), and on the other hand between the N wires of the second layer (C2) and the P wires of the third layer (C3); the content of filling rubber in the cord is comprised between 5 and 30 mg per gram of cord.

Abstract: A tire for a motorcycle having a transverse curvature ratio of at least 0.20 and a total height/width ratio of at least 0.5, includes a radial carcass including textile cords made from lyocell cellulose fibre.

Abstract: A pneumatic tire has an axis of rotation. The pneumatic tire includes a reinforced ply placed in a predetermined location on a toroidal surface, a tread disposed radially outward of the reinforced ply, and a belt structure disposed radially between the reinforced ply and the tread. The reinforced ply includes at least one layer of an open construction woven or knitted fabric having warp yarns extending in a circumferential direction and weft yarns extending in a radial direction.

Abstract: A pneumatic tire has an axis of rotation. The pneumatic tire includes a carcass having at least one reinforced ply and a reinforcing structure proximal to a bead region of the pneumatic tire, a tread disposed radially outward of the carcass, and a belt structure disposed radially between the carcass and the tread. The reinforcing structure includes at least one layer of an open construction woven or knitted fabric having warp yarns extending in a circumferential direction and weft yarns of the carcass ply extending in a radial direction.

Abstract: Provided is a steel cord for reinforcing a rubber article, which has an improved durability against so-called cuts, such as notches and perforations, which are generated in the case of treading on an obtusely or sharply pointed projection, without decreasing the strength in the axial direction of the cord, and without increasing the thickness in the radial direction, namely without increasing the weight of a tire, as well as a tire using the steel cord for reinforcing a rubber article as a reinforcing material, especially a construction vehicle tire. Also provided is a steel cord for reinforcing rubber articles with a multi-twisted structure formed by twisting a plurality of sheath strands formed by twisting a plurality of wires around a core strand formed by twisting a plurality of wires, and the core strand being constituted of an at least three-layer-twisted structure formed by twisting core filaments and sheath filaments.

Abstract: The present invention provides an aircraft tire having a carcass structure capable of sufficiently satisfying recent demands for high pressure resistance without increase in tire weight. An aircraft tire 9 includes a pair of bead portions 2 and a carcass 4 made by stacking two or more carcass layers 3 composed of cords coated with rubber, which toroidally extend between the bead portions 2. Further, with respect to carcass layers 3 of the carcass 4 which are adjacent to each other, elongation at break of a widthwise outer carcass layer 3 is smaller than elongation at break of a widthwise inner carcass layer 3.

Abstract: A pneumatic tire carcass having at least one ply of stabilizing fabric. The stabilizing fabric has a machine direction and a cross machine direction. A plurality of high tenacity reinforcing yarn elements are disposed in the cross-machine direction. A plurality of machine direction yarn elements of relatively lower tenacity than the reinforcing yarn elements are disposed in the machine direction. A segment of the stabilizing fabric is disposed within the carcass with the machine direction yarn elements being in substantial alignment with the direction of tire rotation and with the cross-machine direction oriented radially relative to the direction of tire rotation.

Abstract: A tire having a radial carcass reinforcement, comprised of at least one layer of metal reinforcing elements, said tire comprising a crown reinforcement, which is itself covered radially with a tread, said tread being joined to two beads via two sidewalls. The metal reinforcing elements of at least one layer of the carcass reinforcement are non-hooped cords having, in the permeability test, a flow rate of less than 20 cm3/min and at least one layer of the carcass reinforcement being provided on at least one side with at least one layer of textile threads of straight orientation and said textile threads forming an angle with the direction of the metal reinforcing elements of said at least one carcass reinforcement layer of more than 10°.

Abstract: The invention relates to a tire having a radial carcass reinforcement, consisting of at least one layer of metal reinforcing elements, said tire comprising a crown reinforcement, which is itself covered radially with a tread, said tread being joined to two beads via two sidewalls. According to the invention, the metal reinforcing elements of at least one layer of the carcass reinforcement are non-hooped cords having, in the permeability test, a flow rate of less than 20 cm3/min and the thickness of the rubber compound between the inner surface of the cavity of the tire and that point of a metal reinforcing element of the carcass reinforcement which is closest to said inner surface of the cavity is less than 4 mm.

Abstract: The invention relates to a tire comprising a carcass type reinforcing structure and comprising under the tread strip a crown reinforcing structure consisting of at least two layers of reinforcing elements. According to the invention, the carcass type reinforcing structure comprises at least two half-layers extending at least from the shoulders to the beads and each having an end under the tread strip and at least the surface of the tread strip consisting of a first polymer compound extending at least between the ends of each of the half-layers and of at least a second polymer compound having physicochemical properties that differ from those of the said first polymer compound and covering at least part of each of the half-layers.

Abstract: A pneumatic tire includes a pair of parallel annular bead portions, at least one carcass ply reinforcing structure wrapped around the beads, a tread disposed radially outward of the carcass ply, a belt reinforcing structure disposed radially outward of the carcass ply reinforcing structure and radially inward of the tread in a crown area of the tire, and a layer of cords having an alternating straight/curled construction for improving performance characteristics of the pneumatic tire.

Abstract: A pneumatic tire comprises a carcass composed of at least one carcass ply made of carcass cords arranged at a cord count E. Each of the carcass cords is composed of two strands final-twisted together. Each of the two strand is made of polyethylene terephthalate fibers first-twisted together. The polyethylene terephthalate fibers of the two strands has a linear density D of not more than 2200 dtex. The linear density D in dtex, the cord count E per 5 cm width of the carcass ply, a breaking strength S(N) of the carcass cord, and a Gurley stiffness B (mN) of the carcass cord satisfy conditional equations: E?(?30.6 Ln D+307); B?357/E; and s?4161/E.

Abstract: A tyre includes a carcass structure including at least one carcass ply and a belt structure including at least one belt layer. The carcass ply includes a plurality of metallic cords. Each of the metallic cords includes a plurality of strands. Each strand of the plurality of strands includes a plurality of filaments having a diameter between 0.06 and 0.15 mm. The strands are disposed so as to form a cord structure having a cross section in which a substantially circular layer of outer strands is disposed around a central strand.

Abstract: A tire pair 2 for a motorcycle includes a front tire 6 and a rear tire 8. A difference (F15?R15) between a camber thrust index F15 of the front tire 6 and a camber thrust index R15 of the rear tire 8 at a camber angle of 15° is equal to or greater than ?0.038 and is equal to or smaller than 0.038. A difference (F30?R30) between a camber thrust index F30 of the front tire 6 and a camber thrust index R30 of the rear tire 8 at a camber angle of 30° is equal to or greater than 0.038 and is equal to or smaller than 0.114. The camber thrust index F30 at the camber angle of 30° is equal to or greater than 0.570. A difference (F45?R45) between a camber thrust index F45 of the front tire 6 and a camber thrust index R45 of the rear tire 8 at a camber angle of 45° is equal to or greater than 0.076 and is equal to or smaller than 0.228.

Abstract: A tire (2) according to the present invention includes a tread (4), a pair of beads (8), and a carcass (10) having a radial structure. The carcass (10) has a first ply (32) and a second ply (34). The first ply (32) has a first cord. The first cord is formed by twisting three yarns. The yarn is constituted by an aramid fiber. A fineness of the yarn is equal to or higher than 800 dtex and is equal to or lower than 1100 dtex. The second ply (34) has a second cord. The second cord is formed by twisting three yarns. The yarn is constituted by the aramid fiber. A fineness of the yarn is equal to or higher than 800 dtex and is equal to or lower than 1100 dtex.

Abstract: Tire (10) comprising a radial carcass reinforcement (2) anchored in beads, the tire (10) comprising two sidewalls (1), each sidewall (1) extending between a bead (4) and a crown (3), the two sidewalls comprising a first additional reinforcement (6) positioned either between the carcass reinforcement and the internal cavity of the tire or axially on the outside of the carcass reinforcement and at least one of the sidewalls comprising a second additional reinforcement (5), this tire being characterized in that the first additional reinforcement comprises a plurality of reinforcing elements of textile nature oriented at an angle at least equal to 80° and at most equal to 90° to the circumferential direction, and in that the second additional reinforcement (5) comprises, in the circumferential direction and in an alternating manner, a plurality of first parts (51) and of second parts (52), these second parts (52), having a mean width at least equal to 20 mm, these first and second parts having ultimate tensile st

Abstract: A pneumatic tire includes a carcass ply with carcass cords. The carcass cords comprise high tenacity vinylon fiber, polyethylene naphthalate fiber or polyalylate fiber. Viscoelasticity characteristics per one cord at 120° C. of the carcass cord satisfy the following equations (1) to (3): B>0??(1) B?0.0000437×A+0.042857??(2) B??0.00003636×A+0.163636??(3) (wherein “A” represents a product of complex modulus E*(N/cm2) and cross-sectional area “S” (cm2) of cord), and “B” represents a loss tangent tan?).

Abstract: An aircraft tire inflated to high pressure and including a tread and a crown reinforcement in the form of composite textile cables which form at least one twin ply of two layers of crossed elements obtained by winding, in a zigzag around a cylindrical support and from one edge of the crown reinforcement to the other, a strip of at least one reinforcement until the two layers of crossed elements form angles of opposing directions of between 8° and 30° with the circumferential direction.

Abstract: A runflat tire having an improved runflat durability and including sidewall-reinforcing rubber layer 10 having a crescent-shaped cross section disposed axially inward of carcass 6 in sidewall portion 3, wherein the carcass 6 comprises at least one carcass ply 6A in which carcass cords made of an aramid fiber or a polyethylene naphthalate fiber are arranged at an angle of 70 to 90° with respect to the circumferential direction and are covered with a topping rubber.

Abstract: This invention relates to a tire having an improved durability in the run-flat running without damaging the ride comfort in the usual running, and more particularly to a run-flat tire comprising a sidewall portion provided with a side reinforcing rubber layer having a crescent shape at section wherein a cord layer including a polyketone fiber cord satisfying the following conditions of the following equations (I) and (II): ???0.01×E+1.2??(I) ??0.02??(II) [wherein ? is a thermal shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49 N (cN/dtex)] is disposed in at least a part of a region A ranging from a belt end to a maximum width part of a tire side portion and a region B ranging from a neighborhood of a bead core to a bead filler.

Abstract: A pneumatic radial tire for a passenger car having a pair of bead portions and a carcass having at least one carcass ply toroidally extending between a pair of bead cores embedded in the respective bead portions and containing organic fiber cords. The organic fiber cord is a polyketone fiber cord satisfying the following equation: ???0.01E+1.2 and ??0.02, where ? is a thermal shrinkage stress at 177° C. (cN/dtex) and E is an elastic modulus at 25° C. under a load of 49N (cN/dtex). The cord has a ply-twisting coefficient N1 of 0.35-0.70 and a cable-twisting coefficient N2 of 0.50-0.95, where N1=n1×(0.125×D1/?)1/2×10?3, N2=n2×(0.125×D2/?)1/2×10?3, n1 is a ply twisting number (turns/10 cm), n2 is a cable twisting number (turns/10 cm), D1 is dtext of ply-twisted yarn, D2 is a total dtex, and ? is a specific gravity of the cord (g/cm3).

Abstract: A vehicle of motorcycle type comprising at least two axle systems each equipped with a mounted assembly consisting of a wheel and a tire. Each of the tires comprises, in each sidewall, at least one additional layer of reinforcing elements forming with the circumferential direction an angle of between 20° and 60°, the orientation of the reinforcing elements of the additional layer in a sidewall being symmetrical to the orientation of the reinforcing elements of the additional layer in the other sidewall in relation to the equatorial plane, the angle formed by the plane comprising a reinforcing element of an additional layer with a radial plane comprising the radially inner end of said reinforcing element being oriented in the direction of rotation of the mounted assembly corresponding to the forward movement of the vehicle in the rear tire and in the opposite direction in the front tire.

Abstract: The present invention provides a pneumatic tire in which the structure of a bead portion is optimized to prevent strength of cords constituting a carcass from being deteriorated due to fatigue, so that durability of the bead portion can be improved.

Abstract: A tire with a crown reinforcement that comprises at least three plies of reinforcing elements. At least a first profiled element P1 has an axially outer end that is situated at a distance from the equatorial plane of the tire which is less than the distance separating the plane from the end of a second ply. The profiled element P1 is radially separated from the radially outer liner C1 of a first ply by a second profiled rubber compound element G1. At least a third profiled element P2 has an axially outer end that is situated at a distance from the equatorial plane of the tire which is less than the distance separating the plane from the end of a third ply. The profiled element P2 is radially separated from the radially inner liner C2 of the first ply by a fourth profiled rubber compound element G2.

Abstract: Deformation of a shoulder portion at the time of jumping and landing is suppressed, and acceleration after landing is improved. A pneumatic tire for motocross comprises a pair of rubber reinforcing layers 10 attached to an interior surface 9i of an inner liner rubber 9 and extending in the circumferential direction of the tire in shoulder regions sh in both sides of the tire equator. The above-mentioned rubber reinforcing layer 10 is substantially crescent in cross section reducing gradually in thickness outwardly and inwardly in the radial direction of the tire from a maximum thick-walled portion 10m having a maximum thickness wm of 1.0 to 3.5 mm.

Abstract: A tire comprising a carcass-type reinforcement structure and beads, each bead being extended radially outwardly by a sidewall, the sidewalls meeting radially outwardly with a tread, the intersection of the sidewalls and of the tread defining the shoulder ends of the tire. The tire includes, in the area of each of the sidewalls, at least one layer of materials having a stretch rigidity in the longitudinal direction greater than 5000 daN/mm and the radially outer end of said layer of materials is radially inside the shoulder ends of the tire.

Abstract: A tire comprising a crown reinforcement formed from at least two working crown layers and from at least one layer of circumferential reinforcing elements positioned radially between two working crown layers, the working crown layers adjacent to the layer of circumferential reinforcing elements being on each side of the equatorial plane and in the axial continuation of the layer of circumferential reinforcing elements coupled over an axial width, in order thereafter to be decoupled. A first additional layer of polymer blend having a width at least equal to the width I of the coupling zone and having a maximum thickness of less than two times the thickness of the layer of circumferential reinforcing elements is positioned radially under the working crown layer radially adjacent to and inside the layer of circumferential reinforcing elements and is at least partially radially superposed on the coupling zone of the working crown layers.

Abstract: The present invention relates to a three-layered metal cable of construction L+M+N usable as a reinforcing element for a tire carcass reinforcement, comprising an inner layer C1 having L wires of diameter d1 with L being from 1 to 4, surrounded by an intermediate layer C2 of M wires of diameter d2 wound together in a helix at a pitch p2 with M being from 3 to 12, said layer C2 being surrounded by an outer layer C3 of N wires of diameter d3 wound together in a helix at a pitch p3 with N being from 8 to 20, said cable being characterised in that a sheath formed of a cross-linkable or cross-linked rubber composition based on at least one diene elastomer covers at least said layer C2. The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to tires used in industrial vehicles, more particularly heavy-vehicle tires and their carcass reinforcement plies.

Abstract: A tire comprising an airtight rubber cover (2) and a reinforcing structure essentially formed of a plurality of fibres (30, 40) embedded in the rubber and arranged in layers, this reinforcing structure comprising at least one carcass layer (3) and one crown layer (4). The fibres (30) and (40) of these layers (3, 4) are connected together and oriented, with respect to the median plane (P) of the tire, at respective angles of the order of 90 degrees and 0 degrees, each of these fibres (30, 40) also having a connected cross section of flattened shape.

Abstract: To improve a carcass cord in the compressive fatigue resistance, while achieving an excellent steering stability. The carcass cord 10 is a hybrid cord 13 formed by final-twisting a first strand 11 made of aramid fibers f1 and a second strand 12 made of polyester fibers f2 together. The first strand 11 is formed by mid-twisting together two filament bunches 11A of the aramid fibers f1 first-twisted together. The second strand 12 is formed by a single filament bunch 12A of the polyester fibers f2 first-twisted together.

Abstract: An of object of the present invention is to provide a pneumatic tire which exhibits improved durability of a bead portion due to further suppressing compression strain at a carcass ply fold-up portion and, in particular, suppressing fatigue fracture at the carcass ply fold-up portion. Cord distance between the carcass main body and the carcass ply fold-up portion gradually decreases from the bead core toward the outer side in the tire radial direction to reach the minimum value a, then gradually increases to the maximum value b; provided that height Hf of a flange of an application rim, measured from a base line of the application rim in a state where the tire is assembled with the rim and inflated at a prescribed internal pressure, is 1, heights HA and HB measured from the base line to the positions on the carcass main body corresponding to the minimum and the maximum values, respectively, and the maximum height HT of the tire satisfy relationship formulae below, HT?8.00 1.26?HA?2.14 2.43?HB?3.

Abstract: A tire comprising at least two working layers and at least one layer of circumferential reinforcing elements. The layer of circumferential reinforcing elements comprises at least a central part and two axially exterior parts, the elastic modulus of the rubber compound with which the circumferential reinforcing elements of the central part are coated being less than the modulus of the rubber compound with which the circumferential reinforcing elements of the axially exterior parts are coated.

Abstract: A carcass reinforcement for a tire which is intended to bear heavy loads, comprising a composite fabric which comprises a rubber composition of reduced hysteresis and metal cables reinforcing the composition. The elastomeric matrix thereof comprises natural rubber or a synthetic polyisoprene in a majority proportion, and a reinforcing filler comprising a carbon black which meets all of the following conditions: (i) 45?CTAB specific surface area in m2/g (in accordance with Standard ASTM D3765-80)?70, (ii) 45?BET specific surface area in m2/g (in accordance with Standard ASTM D4820-93)?70, (iii) 45?iodine adsorption index IA in mg/g (in accordance with Standard ASTM D1510-81)?70, (iv) ratio (BET surface area/index IA)?1.07, (v) 115?DBP structure value in ml/100 g (in accordance with Standard ASTM D2414-93)?170, (vi) 85 nm?Stokes diameter dst in nm?145, where dst is the diameter of aggregates corresponding to the maximum frequency of the Stokes diameters in a distribution of aggregates, and (vii) D50/dst?0.

Abstract: A motorcycle tire for uneven terrain travel including two carcass plies, at least one of which is aramid ply 16 using aramid fiber cord 17 obtained by subjecting N (2 to 4) bundles 18 of aramid fiber “f” to final twist, the aramid fiber cord 17 having a total fineness D of 2,200 to 5,010 dtex and a twist factor T represented by the equation (1): T=n×(?{square root over (D)})×10?3??(1) in which n is the number of final twists per 10 cm of the cord (unit: time), and D is a total fineness of the cord (unit: dtex), the twist factor falling within the range of: in the case where the aramid ply 16 is inner carcass ply 6A, from 2.8 to 3.2 when the number of filament bundles 18 is 2, and from 2.4 to 3.2 when the number of filament bundles 18 is 3 or 4, and in the case where the aramid ply 16 is outer carcass ply 6B, from 2.4 to 3.2 when the number of filament bundles 18 is 2, and from 2.2 to 3.2 when the number of filament bundles 18 is 3 or 4.

Abstract: A steel cord, formed of a plurality of steel filaments, has a construction of N×(7×2) wherein N=1 to 7 and within the circumference of the cross-sectional area, not more than 60% of the cord area is comprised of the steel filaments. The steel cord has an elongation at break of at least 3%.

Abstract: A pneumatic tire has a single carcass ply, at least one belt ply disposed radially outward of the carcass ply in a crown portion of the tire, and at least one insert located adjacent the carcass ply in a sidewall portion, the insert providing support for the tire load to enable the tire to operate in underinflated conditions. The carcass ply is comprised of at least one composite cord. The composite cord is formed of at least two first yarns twisted helically about at least one second yarn. The first yarns and the second yarn having different modulus of elasticity, the first yarns having a modulus greater than the modulus of the second yarn.

Abstract: In the pneumatic radial tire of the present invention, a total strength K0 of a belt layer 20 in a circumferential direction of the tire per unit of width at a tire equator surface position P0 is set greater than a total strength of the belt layer 20 in the circumferential direction of the tire per unit of width at a width position P2 corresponding to ? of a maximum width of the belt layer having the tire equator surface CL as a center.

Abstract: A pneumatic tire includes an axis of rotation, a carcass, a tread, and a belt structure. The carcass has at least one reinforced ply and a reinforcing structure for absorbing shear strain. The tread is disposed radially outward of the carcass. The belt structure is disposed radially between the carcass and the tread. The reinforcing structure of the carcass comprises a fabric of cords. Each cord has at least one strand of twisted polyketone yarn. The twisted polyketone yarn has a linear density from 1570 dtex to 1770 dtex and a twist level from 3 TPI to 9 TPI. The cords have a twist level from 3 TPI to 9 TPI and a twist direction opposite to a twist direction of the polyketone yarns.

Abstract: A pneumatic tire for a motorcycle, wherein the tire is optimized in the ground contact shape and the ground contact pressure distribution during high-speed running to achieve excellent driving stability, is provided. Furthermore, a pneumatic tire for a motorcycle, wherein the tire is optimized in the ground contact shape and the ground contact pressure distribution during high-speed running to realize excellent gripping force to stabilize the behavior of the tire near its cornering limit and excellent cornering ability, is provided. Provided is a pneumatic tire for a motorcycle, which employs a multifilament-twist polyketone fiber cord, as a reinforcing material, having a total dtex value of 1000 to 20000 dtex per cord and satisfying the relationships represented by the following Expressions (I) and (II): ???0.01E+1.2??(I) ??0.02??(II) (wherein, E is an elastic modulus (cN/dtex) at 25° C. under a load of 49 N, and ? is a heat shrinkage stress (cN/dtex) at 177° C.).

Abstract: A rubberized fiber material is used in a belt reinforcing layer of a pneumatic tire, and comprises polyketone fibers having substantially a repeat unit represented by the following formula (I): (wherein A is a moiety derived from an ethylenically unsaturated compound polymerized through ethylenic linkage, and may be same or different in repeat units) and a coating rubber covering the fibers, in which the coating rubber has a modulus at 100% elongation (room temperature) of not less than 2.5 MPa but not more than 5.5 MPa and a rebound resilience of not less than 60%. Also, a pneumatic tire comprises a belt reinforcing layer made from the rubberized fiber material.

Abstract: The durability is improved by using as a carcass ply cord or a belt cord of a tire a cord formed by twisting plural steel filaments having a tensile strength of not less than 2700 N/mm2, and a total elongation at break of the cord of 3.0-7.0% without sacrificing the excellent ride comfort.