Abstract: A pneumatic radial tire includes at least two belt plies reinforced with steel monofilaments inclined at an angle of 10.degree. to 30.degree. with respect to the equatorial plane of the tire, the monofilaments being laid at an end count ranging from 25 to 60 ends per inch and having a diameter of from 0.25 to 0.40 mm, a tensile strength of at least 4080 MPa-(2000.times.D).times.95 percent where D is the filament diameter in millimeters and a fatigue resistance of at least 3500 cycles as measured by the three-roll bending fatigue test. Preferably, the filament diameter ranges from 0.30 to 0.35 mm, the tensile strength of each monofilament is at least 4400 MPa-(2000.times.D).times.95 percent and the fatigue resistance ranges from 3500 to 6000 cycles.

Abstract: A pneumatic tire comprises various tire components each comprised of a rubber-coated layer containing a given number of reinforcing elements. In at least one of these rubber-coated layers, not less than 30% of all reinforcing elements are divided into plural groups each comprised of a combination of m-steps and n-rows viewing in a thickness direction of the rubber-coated layer, in which each of m and n is an integer of 2 or more representing the number of the reinforcing elements, and a distance between mutually adjacent and opposite reinforcing elements not grouped with each other is wider than a distance between mutually adjacent reinforcing elements in the group.

Abstract: A pneumatic tire for heavy duty use comprises at least one radial carcass ply, a tread portion disposed radially outwardly of the crown region of the carcass plies and a crown reinforcing structure interposed between the tread portion and the crown region of the carcass plies. The crown reinforcing structure includes a belt assembly having at least a first, radially innermost and a second, radially outermost belt ply. The cords reinforcing the belt plies are preferably made of PET or PEN and have a linear density comprised between 2000 and 16000 Denier, a twist comprised between 2 and 7 TPI and a twist multiplier comprised between 3 and 5.

Abstract: A tire for a vehicle, that is representable by a dynamic rigid-ring tire model with concentrated parameters, has construction features that are substantially equivalent to concentrated parameters that fall within the following intervals corresponding to preselected indices of comfort:rb=100-300 (Ns/m)rbt=2-40 (Nms/rad)rcz=100-350 (Ns/m)rct=10-90 (Nms/rad)Ckx=18,000-70,000 (N),where rb is a radial foundation dampening of said dynamic tire model; rbt is a torsional foundation dampening of said dynamic tire model; rcz is a residual radial dampening of said dynamic tire model; rct is a residual torsional dampening of said dynamic tire model; and Ckx is a slipping stiffness of a brush model of said tread.

Abstract: A radial ply tire (10) has a belt assembly (21) of at least one, and preferably two, belt plies (22, 23). At least one of the belt plies has a gum strip laying flat against a belt edge or folded over the edge of a belt ply such that there is at least one reinforced gum strip on each lateral side of the belt assembly. The reinforced gum strip comprises parallel reinforced cords encapsulated in gum treatment of 0.015 to 0.55 total gauge, wherein the reinforcing cords make an angle of 5.degree. to 90.degree. with respect to the equatorial plane (EP) of the tire.

Abstract: A motorcycle tire having in its normally inflated condition a camber value C/L of between 0.5 and 0.7 and having a maximum axial width between edges of a ground contacting tread wherein in axial cross-section the tread comprises two tread rubber components of different rubber compounds joined by a scarf joint, the scarf joint having a width less than the width of the tread and having an intertread ply comprising reinforcing cords interposed between the two tread rubber components.

Abstract: A tire component used in a pneumatic radial tire is a rubber-coated layer comprised of a given number of reinforcing elements separately arranged in parallel with each other, in which the reinforcing elements corresponding to at least 30% of all reinforcing elements included in the rubber-coated layer are divided into plural groups, and a distance between mutually adjoining and opposite reinforcing elements not grouped with each other is wider than a distance between mutually adjoining reinforcing elements separately arranged at equal spaces in the group. Thus, the occurrence of cracking at cut ends of the reinforcing elements is prevented to improve the tire durability.

Abstract: A tire component used in a pneumatic radial tire is a rubber-coated layer comprised of a given number of reinforcing elements separately arranged in parallel with each other, in which the reinforcing elements corresponding to at least 30% of all reinforcing elements included in the rubber-coated layer are divided into plural groups, and a distance between mutually adjoining and opposite reinforcing elements not grouped with each other is wider than a distance between mutually adjoining reinforcing elements separately arranged at equal spaces in the group. Thus, the occurrence of cracking at cut ends of the reinforcing elements is prevented to improve the tire durability.

Abstract: The present invention is an improved tire design including a continuous annular band or a belt formed of a plurality of relatively flat rigid plates embedded in the rubber between the tread and body plies. The plates are curved to conform to the radius of the tire and are pivotally linked or otherwise pivotally connected together thereby creating a flexible annular belt that is extremely stiff in the in-plane or steering torsional direction due to the engagement of the side edges of the adjacent plates when experiencing an in-plane or steering torsional force but flexible in the radial direction due to the pivotal connection between the adjacent plates.

Abstract: The belt of a pneumatic tire is a laminate of a circumferential belt layer and an inclined belt layer, the circumferential belt layer comprising a plurality of reinforcing elements arranged substantially in parallel with the equatorial plane of the tire and coated with rubber, and the inclined belt layer comprising a plurality of reinforcing elements inclined with respect to the equatorial plane of the tire and coated with rubber, wherein at least in the coating rubber of the circumferential belt layer and the coating rubber of the inclined belt layer adjoining each other, the modulus of elasticity of the coating rubber of the circumferential belt layer is lower than that of the coating rubber of the inclined belt layer. The pneumatic tire of the invention avoids the disadvantage generated by addition of a circumferential belt layer while strengthening the circumferential rigidity by the circumferential belt layer.

Abstract: A pneumatic motorcycle tire provided with a spiral belt and a pair of axially spaced reinforcing layers radially inside of the belt to improve the cornering stability and straight running stability of a motorcycle.

Abstract: A tire includes incisions in a ply of parallel cords of the tire, made pr to the ply's utilization for making the tire. A cutting device for making the incisions is comprised of a reference holder to impose a known orientation to the parallel cords. It is comprised of a blade of a given width C, the blade being positioned transversely relative to the known orientation, the device including an assembly for causing the cutting of the cords by the blade, and including an assembly for moving the blade transversely relative to the holder, and an assembly for moving the ply longitudinally relative to the holder.

Abstract: A motorcycle tire in which the tread face is curved convexly so that the maximum cross-section width of the tire lies between axial edges of the tread portion includes a belt, and the belt comprises at least three plies, wherein the radially inner ply and radially outer ply are made of the same strip of rubberized parallel cords having a strip width of from 85 to 105% the tread width, and the middle ply is made of a strip of rubberized cords having a strip width which is different from that of the inner and outer plies.

Abstract: A heavy duty pneumatic radial tire comprises a radial carcass and a belt superimposed about an outer periphery of the carcass and comprised of at least three rubberized cord layers, cords of two adjacent layers among these layers being crossed with each other at an acute cord angle with respect to an equatorial plane of the tire to form cross cord layers, in which a narrow-width cord layer among the cross cord layers is provided with an end cover rubber having a particular 100% modulus and a space cushion rubber having a particular 100% modulus.

Abstract: In the crown reinforcement (2) of a "heavy vehicle" tire, known as a high tire, the wires or cables of the triangulation ply (20) and the second working ply (22) are the widest of the reinforcement (2) and the radial distances between the respective wires or cables of the two plies at the level of their edges are at most equal to 1.5 mm over an axial distance l at least equal to 2% of the axial width L.sub.0 of the triangulation ply.

Abstract: A bias tire includes a reinforcement member disposed between a first carcass and an additional carcass in the crown region of the tire for restricting the circumferential growth of the tire. The reinforcement member includes a plurality of cords oriented at zero degrees. The total circumferential strength of the reinforcement member is about 20 to 250% of the circumferential strength of the carcass plies. The reinforcement member, first carcass, and additional carcass are formed on a tire building drum as a green tire component in a method of making the tire.

Abstract: A pneumatic tire in which sub-grooves extending at least in the widthwise direction of the tire are provided in a center portion of a tread surface and shoulder portions thereof on both sides of the center portion at a predetermined pitch, both the width and depth of the sub-grooves in the two shoulder portions being set larger than those of the sub-grooves in the center portion, a ratio of the area of the sub-grooves in the two shoulder portions to that of the tread surface being set larger than a ratio of the area of the sub-grooves in the center portion to that of the tread surface. This tire can be used with the air pressure therein set higher under the on-road travelling condition, and lower under the off-road travelling condition.

Abstract: A radial tire has a crown reinforcement (3) having at least two work crown lies (31, 32) of crossed inextensible metal cords, making angles of between 10.degree. and 45.degree. with the circumferential direction XX', and two limiting blocks (40) each composed of at least one ply of metal cords oriented at an angle of between 0.degree. and 10.degree., the blocks (40) being arranged in two separate regions on either side of the equatorial plane XX' and radially between the carcass reinforcement (1) and the radially outermost work crown ply (32). The two limiting blocks (40) are axially joined together by an additional reinforcement (41) which is composed of at least one ply of circumferentially oriented textile or metal cords and is centered on the equatorial plane XX', its tensile rigidity being at most equal to 0.5 times the tensile rigidity of the most extensible ply of the limiting blocks (40).

Abstract: A radial medium truck (RMT) tire has belt or breaker plies which are reinforced by organic reinforcement cords or filaments. In one embodiment, organic monofilaments are used in the belt or breaker plies which have the following characteristics: at least 2,000 denier (2,200 dTex), a tenacity of at least 3.5 g/denier (31 cN/TeX), an initial modulus of at least 30 g/denier (265 cN/Tex) and a shrinkage of at most 6%.

Abstract: In order to improve the endurance of the crown reinforcement (3) of a tyre, he H/S form ratio of which is at most 0.6, the latter is formed radially from the inside to the outside by a triangulation ply (31) of metal cables oriented at at least 60.degree. and two working crown plies (32, 34) formed of inextensible metal cables oriented at angles of between 10.degree. and 45.degree., between which there is inserted an additional ply (33) of metallic elements oriented substantially parallel to the circumferential direction of the tire.

Abstract: A pneumatic radial tire includes a cylindrical steel cord belt layer having a two-layered structure is formed by winding a tape obtained by burying one or a plurality of steel cords in parallel with one another in a matrix, round the outer circumference of a carcass layer on a tread while bending the tape zigzag.

Abstract: A combination system of pneumatic semiradial tires for front and rear wheels comprises a carcass of two carcass plies and a belt of two belt plies, in which cord extending directions in each of the carcass and the belt are opposite to each other with respect to the equator of the tire between the front tire and the rear tire, and is excellent in the turning performance when the combination system is applied to a racing vehicle running on a circuit course in one-way direction over a greater part of a full running distance.

Abstract: A steel cord for reinforcing rubber articles comprises one wave-form or helical core steel filament and five to eight sheath steel filaments disposed around the core steel filament, the pitch Pc of the core steel filament is 3.0 dc/0.34.ltoreq.Pc.ltoreq.10.0 dc/0.34 (dc=diameter of steel core filament) and the core forming ratio Rc=Lc/dc (Lc is an amplitude of the wave or helix of the core steel filament) is within a particular range varying depending on the number of sheath steel filaments. A pneumatic tire contains a cross belt reinforced with the above-mentioned steel cords where(i) an angle .theta. formed by the reinforcing steel cords and the equatorial plane of the tire is:12.degree..ltoreq..theta..ltoreq.30.degree.(ii) a gap between any two adjacent steel cords in the same layer of the cross belt, I, is:0.5 mm.ltoreq.I.ltoreq.2.0 mm(iii) a gauge of the gum between any two facing steel cords in different layers of the cross belt, G, is:0.35 mm.ltoreq.G.ltoreq.2.0 mm.

Abstract: The radial pneumatic passenger car tire of this invention has three belt plies. The inner and outer plies are constructed essentially the same having the same cord material disposed at an angle of approximately 15 to 20 degrees. The belt reinforcing members in the inner and outer plies can be of a textile cord material or preferably are of a nylon monofilament material. The middle ply of the three belt plies has reinforcing members at an opposed cord angle to the other plies of approximately -15 to -20 degrees. The middle ply is made with reinforcing members being either of textile cords or preferably metallic cables.

Abstract: A pneumatic tire particularly adapted for cars, is provided with belt strips (7, 8) each comprising a first and a second series of cords (7a, 7b, 8a, 8b) made of different materials, alternated with each other axially across the width of the tire according to a preestablished sequence. The cords (7b, 8b) of the second series, made of aramid or glass for example, cooperate with those of the first series (7a, 8a), made of steel, to withstand tensile stresses in the longitudinal direction. Conversely, the cords (7b, 8b) of aramid or glass have a greater compliance than the steel cords (7a, 8a) towards compressive stresses. The elastomer incorporating the cords (7a, 7b, 8a, 8b) is filled with reinforcing fibers, short aramid fibers or aramid pulp for example, and has a modulus of elasticity between 15 and 50 megapascals.

Abstract: A heavy duty radial tire having a belt layer assembly formed of at least four layers formed from steel cords. The belt layers may be divided into two groups: a group of outer layers which are disposed at an outer side in a radial direction of the tire, and a group of inner layers which are disposed at an inner side in the radial direction of the tire. Cross-sectional areas of the steel cords of at least one layer of the group of outer layers are greater than the cross sectional areas of the steel cords of the group of inner layers. The steel cords of at least one layer of the group of outer layers and the group of inner layers are provided such that ratios I/A of cross sectional secondary moments I and cross sectional areas A of the steel cords are greater than or equal to 4.5.times.10.sup.-3 mm.sup.2. Accordingly, a superior effect can be achieved in that cut resistance can be improved without deterioration in other properties of the tire.

Abstract: A pneumatic radial tire for use in heavy duty vehicles comprises a belt having a particular structure wherein a rubberized strip containing one or more cords is slantly extended from one of both side edges of the belt toward the other side edge with respect to an equatorial plane of the tire and continuously extended substantially zigzag in a circumferential direction of the tread while bending at each side edge of the belt at different inclination angles of the strip with respect to the equatorial plane in each of side regions of the belt before and after the bending at the side edge.

Abstract: A pneumatic radial tire is formed by disposing a single steel cord belt layer on the outer side of a carcass layer in a tread, and providing a cylindrical organic fiber cord belt layer of a double structure on the outer side of the steel cord belt layer by winding a tape, which is obtained by burying one or a plurality of organic fiber cords in parallel with each other in a matrix, around the steel cord belt layer while bending the tape zigzag.

Abstract: A steel cord for reinforcing rubber articles comprises one wave-form or helical core steel filament and five to eight sheath steel filaments disposed around the core steel filament, the pitch Pc of the core steel filament is 3.0 dc/0.34.ltoreq.Pc.ltoreq.10.0 dc/0.34 (dc=diameter of steel core filament) and the core forming ratio Rc=Lc/dc (Lc is an amplitude of the wave or helix of the core steel filament) is within a particular range varying depending on the number of sheath steel filaments. A pneumatic tire contains a cross-belt reinforced with the above-mentioned steel cords wherei) an angle .theta. formed by the reinforcing steel cords and the equatorial plane of the tire is:12.degree..ltoreq..theta..ltoreq.30.degree.(ii) a gap between any two adjacent steel cords in the same layer of the cross belt, I, is:0.5 mm.ltoreq.I.ltoreq.2.0 mm(iii) a gauge of the gum between any two facing steel cords in different layers of the cross belt, G, is:0.35 mm .ltoreq.G.ltoreq.2.0 mm.

Abstract: The tire of this invention has a belt package with a combination of a steel refinforced inner belt ply and an aromatic polyamide reinforced outer belt ply. The strength per unit width of the aromatic polyamide reinforced ply is made to be within 30 percent greater than the strength per unit width of the steel reinforced belt ply. The tire of this invention has angles of the aromatic polyamide reinforcing members from the mid-plane greater than the angles of the steel reinforcing members from the same mid-plane by 1 to 8 degrees. High impact endurance values are disclosed to be a function of the difference in bending stiffness values for each ply as well as a function of the composite shear stiffness values.

Abstract: A pneumatic tire comprising a belt and a tread disposed radially outside of a toroidal carcass extending between a pair of beads, wherein the belt comprises at least one circumferential belt layer having rubber coated reinforcing elements extending substantially along the circumferential direction of the tire and at least one inclined belt layer having rubber coated reinforcing elements extending at an angle with respect to the tire equatorial plane, wherein at least one said inclined belt layer is protruded radially outwardly at the center portion in the widthwise direction of the belt with respect to its both side portions.

Abstract: A heavy duty radial tire has a belt comprising first, second and third plies disposed in this order from the carcass to the radially outside thereof, each belt ply being made of steel cords laid parallel with each other, the inclining direction of the cords with respect to the tire equator of the first ply being the same as that of the second ply, but reverse to the inclining direction of the third ply, the first belt ply cord angle being 35 to 80 degrees, the second belt ply cord angle being 15 to 30 degrees, and the third belt ply cord angle being 15 to 30 degrees, whereby the belt satisfies (A) the total of the second belt ply strength and the third belt ply strength is 3.4 to 10.0 times the first belt ply strength, and/or (B) the second belt ply strength is in the range of from 1.05 to 2.0 times the third belt ply strength, wherein the strength of each belt ply is defined as the total tensile strength of belt cords in a predetermined unit width of the belt ply.

Abstract: The radial pneumatic tire of this invention is suitable for use on passenger cars, light trucks, or the like. The belt package of this otherwise conventional tire has three belts which are preferably steel. The first belt is at an angle of 55 to 80 degrees, the second belt is at an angle of 18 to 28 degrees and the third belt is at an angle or -18 to -28 degrees with respect to the midcircumferential plane. The parallel reinforcing members of the first belt ply are spaced apart a distance at least equal to the parallel reinforcing members of the second belt ply. The parallel reinforcing members of the third belt ply are spaced a distance apart a distance less than those of the second belt ply. The strength per unit width in the circumferential direction of the first belt ply is less than the strength per unit width in the circumferential direction of the second belt ply. The strength per unit width of the third belt ply is greater than that for the second belt ply.

Abstract: A motorcycle radial tire comprises a tread reinforced between its edges by a breaker assembly and having in its normally inflated fitted condition a camber value C/L of between 0.5 and 0.7, a reinforcing carcass of radially disposed cords extending radially inside the breaker assembly and between two bead regions and wrapped in each bead region around an annular bead core from the axial inside to the outside to form carcass ply turn-ups, and tire sidewalls between the tread edges and bead regions, the tire characterized in that the breaker assembly comprises two breaker plies each reinforced with aromatic polyamide cords oppositely inclined with respect to the circumferential direction of the tire and a supplementary ply disposed radially adjacent to the breaker plies and reinforced with nylon reinforcements laid parallel to each other and disposed at an angle in the range of 75.degree.-90.degree. to the circumferential direction of the tire.

Abstract: A pneumatic tire for trucks, buses, etc. having a tread profile, before inflation, which has a first circular arc forming a tread center area and second circulr arcs forming shoulder ribs at both sides of the first circular arc, the first and second circular arcs intersecting together at a point from which the shoulder rib starts to extend and inwardly of which there is a 1/4 tread width point from a tread center axis, the first and second circular arcs having an inner radial divergence, between an inside wall top of an outermost main groove and the intersecting point, of up to 3 mm and an outer edge divergence, between an outer edge of the shoulder rib and an elongated line of the first circular arc, of up to 10 mm, whereby a good river wear resistance is attained.

Abstract: In a heavy duty pneumatic radial tire, when the belt is comprised of not less than three main belt layers, a belt layer other than a belt layer adjacent to a carcass is a narrow-width rigidity reinforcing layer, or when the belt is comprised of not less than four main belt layers, a belt layer adjacent to the carcass and a belt layer other than a belt layer adjacent to the belt layer are narrow-width rigidity reinforcing layers. Such a narrow-width rigidity reinforcing layer has given width and inclination cord angle.

Abstract: A radial pneumatic tire comprises a pair of axially spaced apart beads. A radially reinforced carcass extends between and is secured at opposite end portions to the beads. The carcass includes a plurality of parallel extending reinforcing members. Each of the reinforcing members is disposed in a radial plane. A tread is located radially outward of a crown portion of the carcass. The tread is for engagement with a ground surface. A belt reinforcement package is disposed between the carcass and the tread. The carcass and belt package have particular profiles when the tire is properly inflated.

Abstract: A pneumatic tire for a vehicle comprises a carcass ply extending between two bead regions and passing through a tread region which extends between two tread contact edges, a tread region reinforcing breaker radially outwards of the carcass in the tread region and a ground contacting tread surface curved in the axial direction wherein the curvature of the outer tread surface when the tire is mounted on its design wheel rim and normally inflated has a continuously decreasing radius from a point P which is at a distance SP in the axial direction from the tire circumferential center line equal to 20% of the distance from the tread center to the adjacent tread contact edge.

Abstract: A pneumatic tire for a vehicle comprises a carcass ply extending between two bead regions and passing through a tread region which extends between two tread contact edges, a tread region reinforcing breaker radially outwards of the carcass in the tread region and a ground contacting tread surface curved in the axial direction wherein the outer surface of the widest breaker ply when the tire is mounted in its design wheel rim and normally inflated has a curved shape in the tire axial direction and has a continuously decreasing radius from a point B to the adjacent edge of the breaker wherein point B is at a distance SP in the axial direction from the tire circumferential centerline equal to 20% of the distance from the tread center to the adjacent tread contact edge.

Abstract: A radial ply tire for vehicle wheels has a torus-shaped body of elastomeric material which contains a belt-shaped reinforcing insert which has in the region underneath the tread of the tire a strip which is stretchable, pre-loadable and, under the influence of external forces, restorable in the circumferential direction of the tire. The strip of the reinforcing insert contains apertures extending largely transversely with respect to the circumferential direction of the tire. The apertures extend only partially through the strip in a transverse direction and are arranged in rows, the apertures being parallel and offset with respect to one another in successive rows. Between them there are transversely extending unbroken portions which provide the desired transverse stiffness of the belt.

Abstract: Tires using high tensile reinforcement with values of at least 1240N (280 lbs) for U+T type cord and at least 2000N (450 lbs) for bunched type cord.

Abstract: An improved pneumatic radial ply truck tire 10 having an aspect ratio below 0.70 is designed to replace two conventional truck tires on the trailer axle of semi-trailers. These tires 10 are commonly referred to as Super Single Tires. The improved tire 10 has a radially outer tread surface 30 which is defined by three radii of curvature R.sub.1, R.sub.2, and R.sub.3 on each side of the tread centerline C.sub.L. Radii R.sub.1 and R.sub.2 are internal to the tire 10 whereas radius R.sub.3 is external to the tire 10 and defines the outer surface 30C of the tread shoulder region. The combination of curvatures 30A, 30B and 30C yields a substantially rectangular contact patch greatly improving the treadwear rates of the tire 10. The tire 10 has the radius R.sub.2 in the range of 1.3 to 2 times the radius of curvature R.sub.1, the external radius R.sub.3 is in the range of 0.7 to 2.5 times the first radius of curvature R.sub.1, preferably in the range of 1.0 to 2.5 times R.sub.

Abstract: An asymmetric reinforcement belt structure for a pneumatic tire includes an outer belt and inner belt, each reinforced with a plurality of generally parallel cords. The outer belt has a first portion between the centerlines of the cords and a first surface and a second portion between the centerlines of the cords and a second surface. The first portion has a thickness T1 which is between 110% and 150% of T2. Similarly, the inner belt has a third portion and a fourth portion, with the third portion being between the centerlines of the cords and a third surface and a the fourth portion being between the centerlines of the cords and a fourth surface. The fourth portion has a thickness T4 which is between 50% and 90% of a thickness of the third portion T3. Orienting the cords within the belts in this way separates them slightly more than would be so if the belts were symmetrical.

Abstract: A pneumatic tire having improved rolling resistance and increased resistance to separation between coat rubber and steel cords embedded therein. The steel cord is formed from two intertwisted steel filaments containing 0.80-0.92 weight percent of carbon. The rubber coat has 100% elastic modulus of 35-55 kg/cm.sup.2. Each of the cords and the rubber coat has a specified mean cross-sectional area (Sa, Sb). The cords are spaced apart from each other by a specified distance across the junction of adjacent belts.

Abstract: The tires for vehicles possess under their tread a belt which extends in the circumferential direction. At least one, preferentially two, layers contain, as strengthening and stabilizing means, foils or sheets with direction-dependent rigidity, which possesses its highest value in a preferred direction. The foils or sheets are so arranged that the preferred direction is oblique to the circumferential direction. Preferentially, the direction-dependent rigidity is realized with a waving or crimping. Through this alignment, which is arranged oblique to the tire circumference, the stabilizing effect of the waving is seen in both the longitudinal as well as the oblique directions. Thus, in comparison with the usual belted tires, less material is needed in tire production, and these tires are both light, but nevertheless possess good driving characteristics and superb rolling resistance.

Abstract: A pneumatic tire comprises: a carcass extending between bead portions of the tire; a belt reinforcement layer disposed radially outside the carcass and including at least one cord ply extending between tread edge portions to reinforce a substantially full width of the tread portion; and a cord layer disposed radially outside the belt reinforcement layer and having a width narrower than that of the belt reinforcement layer, wherein the cord layer is disposed beneath a rib defined between circumferentially extending grooves to reinforce the rib, or the cord layer is disposed asymmetrically with respect to the tire equator to provide a asymmetrical reinforcement for the tread.

Abstract: A radial tire for motorcycles which comprises: a carcass ply of organic fiber cords arranged radially at an angle of 70 to 90 degrees to the tire equator and turned up around bead cores to form two turned up portions and a main portion therebetween; and a belt disposed radially outside the carcass and inside a tread, wherein the radial height Ht of the radially outer edge of each carcass turned up portion is 0.5 to 1.2 times the radial height of the tread edge, both from the bead base. The belt is composed of three pieces, two lateral pieces and a central piece therebetween, each piece being made of at least one spirally wound cord having an elastic modulus of not less than 600 kgf/sq. mm and formed by winding spirally a ribbon of rubber in which the at least one cord is embedded. The width of the central piece of the belt is 0.1 to 0.6 times the tread width. The central piece is differed from at least one of the lateral pieces in respect of cord specification and/or cord arrangement.

Abstract: A heavy duty radial tire including a tread region reinforced by a breaker strip assembly comprising at least three breaker plies of fabric of parallel metallic cords in which the cords of the radially innermost first ply and those of the third ply are inclined at a relatively small angle with respect to the equatorial plane of the tire, wherein the cords of the second ply, disposed radially between the first and third plies, are the only cords inclined at an inclination angle with respect to the equatorial plane in the range of 40.degree. to 85.degree., and wherein the cords of the first and third plies are inclined in opposite directions to each other and have inclination angles with respect to the equatorial plane in the range of 5.degree. to 40.degree..

Abstract: A heavy duty rubber composite has a reinforcement structure composed of a network material made from a three-dimensionally shaped textile material forming an open-mesh three-dimensional network which penetrates the rubber material three-dimensionally in a skeleton-like manner. The network material is advantageously firmly incorporated into the rubber composite by appropriately linking the network material with the other reinforcements present in the rubber composite.

Abstract: A pneumatic radial tire containing a non-metallic cord breaker belt disposed radially outside a carcass, and a jointless band belt disposed radially outside the breaker belt, said band belt being made of at least one hybrid cord wound spirally and continuously in the circumferential direction of the tire at an angle of 0 to 3 degrees with respect to the tire equator. The hybrid cord includes a low elastic modulus thread and a high elastic modulus thread which are finally-twisted together, said low modulus thread having at least one low modulus fiber, first-twisted and having an elastic modulus of not more than 2000 kgf/sq.mm and said high modulus thread having at least one high modulus fiber first-twisted and having an elastic modulus of not less than 3000 kgf/sq.mm. In the band belt ply, the count (E) of the hybrid cord per 5 cm width, the stress (F1) in kgf of the hybrid cord at 2% elongation, and the stress (F2) in kgf of the hybrid cord at 6% elongation satisfies the following relationships: FI.times.