Abstract: A heavy duty pneumatic radial tire has an outer profile of a tread portion in radial section of the tire having a given composite arc shape as a function of the internal structure of the tire, particularly a belt structure including at least two belt layers inclusive of main cross belt layers of steel cords.

Abstract: A pneumatic tire which comprises a belt disposed radially outside a carcass and inside a tread and having opposite axial edges, the belt comprising a cord continuously wound around the carcass while running zigzag between the edges of the belt to defining cord segments extending between the edges of the belt, the cord segments including first cord segments and second cord segments, the first cord segments laid substantially parallel with each other, and the second cord segments laid substantially parallel with each other and crosswise to the first cord segments.

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 vehicle tire having a radial carcass and, disposed radially outwardly thereof, a belt with at least two plies that are disposed one above the other in a radial direction. Each of the belt plies contains individual filaments of metal wire that are disposed parallel to one another. Each of the filaments, within a circumferential plane, extends at an angle to the circumferential direction of the tire from one belt side that axially delimits the belt to the other belt side that axially delimits the belt, with the individual filaments of two radially superimposed belt plies being respectively oriented diagonally and crossed relative to one another. The individual filaments have a wavelike or helical configuration in the circumferential plane, and have amplitudes that in the circumferential direction are distributed in a random manner.

Abstract: A radial tire improved in the ground pressure distribution, in which the thickness (A) of the tread rubber at the tire equator is larger than the thickness (B) at an effective belt edge point (P), a belt edge camber height (CH) is in the range of from 0.5 to 0.75 times a shoulder camber height (SH), and the belt edge camber height (CH) is in the range of from 0.5 to 0.75 times a carcass camber height (KH), wherein the belt edge camber height (CH) is the radial distance between the effective belt edge point (P) and an axially inner point (Q) located axially inward of the point P by an axial distance of 0.

Abstract: A cut resistant pneumatic tire is provided. The tire has a monofilament wire structure embedded in or under its tread or sidewall, and is used in off the road applications such as mining. The monofilament wire has a diameter of 0.4 to 1.2 mm and is made of brass plated steel. The wire may be woven or may have a spring link configuration. Two monofilament wires may be twisted together, and when two such wires are used, the total diameter is 0.8 to 1.4 mm.

Abstract: A pneumatic radial tire comprising a carcass and a belt comprising belt plies composed of steel belt cords wherein at least two circumferential grooves are constructed in the tread part continuously in the direction of the tire's equator, and lateral grooves in some parts defined by dividing the tread part in the direction of the tire's axis into approximately three or four equal areas. The tire prevents one-side drifting of a car in driving, improves a straight-forward driving performance.

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 pneumatic tire having an improved carcass structure capable of increasing the sidewall rigidity, the tire (1) comprising a carcass (8) composed of an inner carcass ply (9) and an outer carcass ply (10), the inner carcass ply having a pair of edges turned up around the bead cores (5) from the axially inside to outside of the tire, each turned up portion thereof extending radially outwardly beyond the maximum tire width point (B), a bead apex (6) disposed between the main portion and the turned up portion, the outer carcass ply having a pair of edges each disposed between the bead apex and each turned up portion of the inner carcass ply, the edges of the outer carcass ply terminated radially outward of the radially inner end of the bead core, each sidewall portion provided with at least one steel cord reinforcing layer (11a, 11b, 11c) made of parallel steel cords.

Abstract: A pneumatic tire which is provided radially outside a carcass (6) with a belt (9) made of cords (10) embedded in topping rubber, each of the belt cords comprises four steel monofilaments (12A and 12B) including one or two waved steel monofilaments (12A) and unwaved steel monofilaments (12B), the four steel monofilaments having the same diameters are compactly twisted together so as to make alternate contact portions and non-contact portions (P) with a gap (T) between at least one waved steel monofilament and the adjacent steel monofilaments, and the four steel monofilaments have the same diameter (d) of 0.2 to 0.35 mm.

Abstract: A pneumatic radial tire for heavy duty vehicles comprises a radial carcass, a belt, a belt reinforcing layer and a tread, in which the belt has a particular structure formed by using a rubberized strip containing one or more cords therein, and the belt reinforcing layer comprised of at least one rubberized cord ply in a region corresponding to at least each side region of the tread, and the belt and the belt reinforcing layer satisfy a ratio h/h.sub.0 of not more than 65%. In the tire of the above structure, the occurrence of shoulder wear is controlled together with the avoidance of belt end separation and the durability is improved.

Abstract: A pneumatic tire, which is improved in high speed durability, maintaining the required tread rubber thickness for mud and snow tires, is disclosed. The tire comprises a radial carcass and a belt including a breaker. The breaker comprises an inner ply and an outer ply, each composed of steel cords laid at an angle of 16 to 26 degrees to the tire equator. The outer breaker ply has a width WB2 of 0.7 to 0.75 times the tire cross sectional width TW. The inner breaker ply has a width WB1 of 1.03 to 1.10 times said width WB2 of the radially outer breaker ply. The tread profile comprises a crown portion defined by a circular arc having a single radius Rc of curvature of 1.4 to 2.6 times the tire cross sectional width TW and having the center on the tire equatorial plane, and a pair of tread shoulder portions continuing from the axially outer ends of said tread crown portion, each defined by a circular arc having a single radius Rs of curvature of 0.10 to 0.20 times the tire cross sectional width TW.

Abstract: A heavy duty rubber composite having a reinforcement structure is described, wherein the reinforcement structure is 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.

Abstract: A belted radial ply tire which comprises a bead core disposed in each bead portion, a carcass extending between the bead portions and turned up around the bead cores, and a belt comprising at least two cross plies disposed radially outside the carcass and inside the tread, andin a state that the tire is mounted on its regular rim and inflated to its regular inner pressure but loaded with no tire load, the effective belt width BW of the effective belt part BE of the belt, the belt edge camber height CH of the belt, and the tire section width TW satisfy2.50(BW/TW)-1.25<CH<13.3(BW/TW)-4.65.

Abstract: A pneumatic tire has a belt reinforcing structure comprising a folded belt ply and a spirally wound structure extending transversely between the folded edges of folded portions of the folded belt ply. No cut belts are used in the assembly. In an illustrated embodiment, both the folded belt ply and the spirally wound ply are reinforced with aramid cords. Also, a plurality of spirally wound plies can be used.

Abstract: A medium pneumatic truck tire (10), has a belt package (18) comprising a plurality of belt plies (20, 22, 24, 26). The tread (16) of the tire is 200 to 380 mm wide (8 inches to 15 inches). In the shoulder area (31) of the tire, an overlay strip (32) is abutted against belt edge (34) of top belt (26) and is disposed over belt edge (33) of the adjacent belt (24). The overlay strip (32) is applied in two layers, and the reinforcing cords (38) therein have an angle of about 0.degree. with respect to the equatorial plane of the tire (10). The overlay strip (32) is about 51 mm (2 inches) wide and has an overlap splice of about 40 mm (1.5 inches). The overlay strip (32) overlaps belt edge (36) by 15 to 20 mm (0.5 to 0.75 inch).

Abstract: A radial tire for motorcycle has a belt layer of cords with modulus of elasticity of 600 kg/mm.sup.2 or more wound spirally on a carcass nearly parallel to the tire equator, and a bead apex rubber disposed on a bead core between a carcass main portion extending from a tread to a bead core and a carcass turned up portion. The bead apex rubber consists of a soft apex part SA with JISA hardness of 50 to 60 degrees extending radially outward from the bead core, and a hard apex part HA with JISA hardness of 70 to 95 degrees extending radially outward from the soft apex part SA. A height h1 the soft apex part SA from a bead base is 0.20 to 0.40 times a height h0 of the tread end, and a height h2 of the hard apex part HA is 0.50 to 1.25 times the height h0 of the tread end.

Abstract: A radial tire for a four wheeled vehicle comprising a reinforced carcass ply extending between two bead regions through sidewall regions to a tread region and a reinforcing breaker disposed in the tread region extending circumferentially around the tire radially outside the carcass ply wherein the tread region is substantially curved in cross-section and has a camber value C/L of between 0.25 to 0.75. The breaker includes at least two plies of reinforcing fabric, a narrower breaker ply which is radially innermost and a wider breaker ply which is radially outermost, and each of the breaker plies except the outermost ply has adjacent to each of its lateral edges a circumferentially extending support strip which extends laterally outward from the edge of the breaker ply to at least the lateral position of the edge of the widest breaker ply.

Abstract: The weight, space and convenience advantages of a run-flat tire can be substantial. This is especially true for the urban-economy car or family type vehicles which have limited space available for a spare tire and inadequate space for the removed flat tire. These vehicles also have higher comfort requirements that must be addressed. The mini-spare solution to the flat tire problem has very limited performance capabilities. Other solutions include major modifications in the rim and/or the tire, which are not cost effective or compatible with a conversion to standard tires on the same rims.The run-flat tire of this invention includes thickened sidewall portions, a belt package with a cap ply, lower sidewall rubber support portions, a specially designed bead seat area with a rim seat ply and three carcass layers. The classical problems of inflated vs. deflated performance tradeoffs in ride comfort, handling, radial stiffness and endurance of the tire are substantially improved.

Abstract: A belt ply for pneumatic tires including at least one ring of sheet or strip material extending in the circumferential direction of the tire. These rings include extension zones formed of undulations, projections or recesses, extending transversely to the circumferential direction of the tire. The rings additionally include notches or recesses of defined length extending in the circumferential direction to improve the flexibility of the tire in the extension zones.

Abstract: In order to improve the resistance of a crown reinforcement (20) of a radial tire to perforations, cuts and the drawbacks resulting therefrom, the crown reinforcement (20) is formed of three plies (21, 22, 23) of non-stretchable metal wires or cables. The resistances R.sub.1, R.sub.2, R.sub.3 of these plies being such that1.5.ltoreq.R.sub.1 /R.sub.2 .ltoreq.2.5and0.5.ltoreq.R.sub.3 /R.sub.2 .ltoreq.1.5,the two radially outer plies (22, 23) having wires or cables separated by a distance (e) equal to at least their diameter.

Abstract: A pneumatic tire 20 is disclosed. The tire 20 has a carcass 21, a belt reinforcement member 26 disposed radially outwardly of the carcass 21, an annular tread 32 disposed radially outwardly of the belt reinforcing member 26, the tread 32 having a net-to-gross ratio of less than 35%. The tread 32 comprises an inner tread 34 and a plurality of traction lugs 50. At least 25% of the lugs 50 have aligned axially inner and axially outer portion is separated by a notch 60 extending between the leading edges 52 and trailing edges 54 and having a depth (n.sub.h) greater than 50% of the radial height (l.sub.h) of the lug 50 at a center of the notch along the leading edge 52, the center being located at a position 40% to 60% of the lug length (l.sub.L) from the axially inner end 53. Both the axially outer and inner portions of the notched lugs 50 have axially inner ends including enlarged lug heads.

Abstract: A pneumatic radial tire in which a tread weight .alpha. per unit ground contact area is selected to be not greater than 1.80.times.10.sup.-3 kg/cm.sup.2, a cord reinforcing ply which extends up to a location outside of a top end of a bead filler in a radial direction of the tire is disposed in a bead portion and a cord angle .theta. of the cord reinforcing ply relative to a circumferential direction of the tire is selected to be 25.degree.-80.degree., a height RH of the cord reinforcing ply from a rim base up to the top end of the cord reinforcing ply, which is measured in the radial direction of the tire, is selected to satisfy the ratio, RH/SH=0.28-0.65, with SH being a cross-sectional height of the tire, and a height FH of the bead filler from the rim base up to the top end of the bead filler, which is measured in the radial direction of the tire, is selected to satisfy the ratio, FH/SH=0.11-0.28, with SH being the cross-sectional height of the tire.

Abstract: The invention refers to the manufacture of a pneumatic tire having a toric profile at high transversal curvature wherein the reinforcing annular structure and the tread band are shaped together, starting from a cylindrical configuration to the final topic profile, in a single shaping step, before being assembled to the carcass, the step for vulcanizing the pneumatic tire being carried out without requiring a further shaping of the pneumatic tire.

Abstract: A heavy duty pneumatic radial tire comprising a carcass, a tread and a belt layer consisting of four belt plies piled radially one above another and containing steel cords therein. The four belt plies consist of a large belt ply having a width wider than that of the other belt plies, a middle belt ply arranged radially inward of the large belt ply and having steel cords oblique in the same directions as those of steel cords of the large belt ply, a first small belt ply arranged between the large belt ply and the middle belt ply and having steel cords oblique in opposite directions to those of the cords of the large belt ply and a width smaller than that of the middle ply, a second small belt ply arranged radially inward of the middle belt ply and having steel cords oblique in opposite directions to those of the cords of the large belt ply and a width smaller than that of the middle belt ply.

Abstract: A motorcycle tire which comprises a carcass (6) extending between tire bead portions (4), and a belt (7) disposed radially outside the carcass, wherein the belt (7) is formed by spirally winding at least two reinforcing members (11 and 12) having different elastic moduli so that the lower elastic modulus reinforcing member (11) and the higher elastic modulus reinforcing member (12) serially appear in the widthwise direction of the belt.

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 pneumatic radial tire for truck and bus comprises a carcass ply containing cords arranged substantially in a radial direction of the tire and a belt superimposed about said carcass ply and comprised of plural belt layers each containing steel cords arranged at a cord angle of 5.degree.-20.degree. with respect to an equator of the tire. In this case, the steel cord for the belt layer has a two-layer structure of a core comprised of two steel filaments and a single sheath comprised of 6-8 steel filaments and satisfies the particularly relationships on filament diameter, twisting pitch, bending rigidity, tensile strength and distance between adjoining cords.

Abstract: In a pneumatic tire of the type wherein both end portions of a carcass layer are supported by a pair of right and left bead cores, respectively, and at least two belt layers are disposed on the outer periphery of a tread of the carcass layer, a cord reinforcing layer having a cord weight per unit width of not greater than 1.30 g/mm on a radial section and a cord angle of not greater than 80.degree. with respect to a tire circumferential direction is disposed at a buttress portion between a maximum width portion of a tire section and the end portion of the belt layers in a tire width-wise direction.

Abstract: A cut resistant pneumatic tire is provided. The tire has a monofilament wire structure embedded in or under its tread or sidewall, and is used in off the road applications such as mining. The monofilament wire has a diameter of 0.4 to 1.2 mm and is made of brass plated steel. The wire may be woven or may have a spring link configuration. Two monofilament wires may be twisted together, and when two such wires are used, the total diameter is 0.8 to 1.4 mm.

Abstract: The present invention relates to a bias pneumatic tire having a belt structure comprising six annular layers. The tire of the present invention has particular utility as an aircraft tire and avoids many of the undesirable stresses/strains resulting from the deformation in the tread areas of the tire.

Abstract: A pneumatic radial tire comprising a carcass and a belt comprising belt plies composed of steel belt cords wherein at least two circumferential grooves are constructed in the tread part continuously in the direction of the tire's equator, and lateral grooves in some parts defined by dividing the tread part in the direction of the tire's axis into approximately three. The tire prevents one-side drifting of a car in driving, improves a straight-forward driving performance.

Abstract: A motorcycle radial tire includes a carcass having at least one ply of radially arranged organic fiber cords turned up around a pair of bead cores, the radial height (Ht) of the radially outer edge of the carcass turned up portions being more than 0.6 times and less than 1.2 times the radial height (Hs) of tread edges, a first belt having one cord or a plurality of parallel cords wound spirally so that the windings thereof are laid at small angles with respect to the tire equator, a second belt having one ply of parallel organic fiber cords laid at at angle of 10 to 30 degrees with respect to the tire equator, a bead apex made of rubber having a JIS(A) hardness of 65 to 75 disposed between the main portion and each turned up portion of the carcass, and the radial height (Ha) of the radially outer edge of the bead apex from the bead base line being more than 0.5 times and less than 1.2 times the radial height (Hs) of the tread edges.

Abstract: A pneumatic radial tire comprising a toroidal carcass layer having a number of radially extending cords buried therein, a belt layer arranged on a radially outer side of the carcass layer and containing a number of nonstretchable cords inclined to an equatorial plane of the tire, and a reinforcing layer arranged between the carcass layer and the belt layer and containing a number of reinforcing elements. The reinforcing elements extend in parallel to the tire equatorial plane as a whole, and are waved at a substantially equal wavelength. The phase of a plurality of the reinforcing elements among all the reinforcing elements buried in the reinforcing layer is different from that of the remaining reinforcing element or elements.

Abstract: A steering stability in a pair of pneumatic radial front and rear tires is considerably improved without sacrificing the tire durability by making a circumferential rigidity of an auxiliary belt in the front tire at a portion corresponding to a central zone of a belt in widthwise direction thereof larger than that of an auxiliary belt in a rear tire at the portion corresponding to the central zone of the belt in widthwise direction thereof.

Abstract: A pneumatic tire in which the steel belt ply or plies are enclosed in at least two wraps of a cap ply fabric which is wider than the steel belt ply and which is adhered to the belt ply as well as the tire cord outside of the belt ply.

Abstract: A pneumatic radial tire for a two-wheeled vehicle, including a carcass constituted by at least one carcass ply composed of cords extending at an angle of 75.degree. to 90.degree. with respect to an equatorial plane of the tire, and a belt constituted by at least two belt plies. The belt plies is arranged radially outwardly on an outer peripheral side of a crown portion of the carcass, and composed of cords extending substantially in a circumferential direction of the tire. The number of the cords per unit width of an outermost belt ply is in a range of 30% to 80% of that of a belt ply adjacent radially inwardly to the outermost belt ply as considered on the average over the entire width of the belt.

Abstract: A pneumatic radial tire for passenger cars having a plurality of grooves formed in the tread and extending at least circumferentially of the tire, the tread being provided with two belt plies therein. The grooves have a depth in the range of 6.0 to 8.5 mm, with the thickness of the under-groove rubber layer from the bottom of the grooves to the outer belt ply being fixed within the range of 0.5 to 2.5 mm. The belt plies are both made from aramid fiber cords, or either belt ply is made from aramid fiber cords and the other ply from steel cords. The both edge portions of at least one of the belt plies are folded back toward the center of the tread at a fold percentage of 8 to 100 percent.

Abstract: A method of woven webs comprising tire cord splicing headers or tabbies can be stabilized against lateral (weft) distortion without the need for temples, by incorporating reinforcing weft strands of a stiff resilient yarn, i.e. a composite yarn comprising a stiff resilient core mantled with fibers, i.e. staple fibers applied by a core spinning technique.

Abstract: A heavy-duty radial tire including a carcass and four steel cord belts bearing most of stress of the tire. The carcass and the belts cross each other. An outer side belt layer of two belt layers of different cord diameters which are defined by the belts being divided into the two belt layers, the outer side belt layer being a belt layer of the two belt layers which is disposed at an outer circumferential side of the tire in a radial direction thereof; and an inner side belt layer disposed further toward an inner circumferential side of the tire in the radial direction thereof than the outer side belt layer. A difference between belt cord angles of respective belts of the outer side belt layers is less than or equal to 5.degree.. A difference between belt cord angles of respective belts of the inner side belt layers is less than or equal to 5.degree.. Further, 1<.PHI. out/.PHI. in.ltoreq.2.5, and .alpha. in-.alpha. out.gtoreq.5.degree. and (.alpha. out+.alpha. in)/2.ltoreq.23.degree., wherein: .PHI.

Abstract: Tires of a large size for use off-the-road with super tensile reinforcement having values of at least 4655N (1046 lbs) break strength for bunched type cord.

Abstract: A motorcycle tire includes a belt consisting successively, starting from ing ply 22 to tread 11, of a crown ply 12 at 0.degree., then a crown ply 13 at 45.degree., and a crown ply 14 at -45.degree..

Abstract: A pneumatic tire having two different bead diameters has handling, ride and treadwear advantages. The tire is made so that the rho.sub.m of the longer sidewall and the rho.sub.m of the shorter sidewall are equal. The rho.sub.m of the longer sidewall is made equal to the rho.sub.m of the shorter sidewall by establishing a belt profile wherein the amount of drop at a belt edge is specified to give a mold drop of 0.30 to 0.33 of estimated tire deflection, applying an inflated shape prediction formula to calculate the inflated belt profile and varying the value of rho.sub.m until the drop at the end of the belt closely matches a specified value, using the cosine law to specify the change in belt angle with radius, choosing a shoulder point under the belt edge that allows a 0.050 inch wedge between the bottom of the belt and the top of the carcass ply and varying the slope of the ply at the shoulder point until the inflated ply line passes through the Y-max location at rho.sub.m.

Abstract: A high-speed running pneumatic radial tire comprises a cylindrical crown portion, a pair of sidewall portions extending inward therefrom, a radial carcass extending from one of the sidewall portions through the crown portion to the other sidewall portion, and a belt and a tread successively superimposed on the crown portion outward in the radial direction of the tire. The tread has plural rows of blocks defined by plural circumferential grooves and many lateral grooves, and the belt is comprised of at least two main crosscord belt layers and an auxiliary belt layer arranged thereon. The auxiliary belt layer is formed by spirally winding a rubberized ribbon ply of heat-shrinkable cords on the main belt layers, in which an overlapped amount of the ribbon ply is made large in a zone of the tread substantially corresponding to the block row than in a zone of the tread substantially corresponding to the circumferential groove.

Abstract: A pneumatic tire includes a toroidal carcass anchored by at least a pair of bead cores and a belt having strips. The strip has as reinforcing elements a plurality of zigzag or wave-shaped cords or filaments arranged side by side around a crown of the toroidal carcass. The strip is coated with a high molecular weight material less in modulus of elasticity than the reinforcing elements. Waves of the reinforcing elements of the strips are arranged in width directions of the belt so that ratios of amplitudes to wave lengths of the waves are maximum at side edges of the belt. The ratios are preferably progressively increased toward the side edges of the belt. Ratios of amplitudes to pitches of the waves are 0.005-0.175 and ratios of pitches of the waves to maximum circumferential lengths when filled with a normal inner pressure is less than 0.025.

Abstract: An off-the-road pneumatic steel radial tire comprises a radial carcass comprised of at least one carcass ply containing steel cords and a belt superimposed about a crown portion of the carcass and comprised of at least three laminated steel cord layers. In this tire, the belt includes at least two main belt layers each containing substantially inextensible steel cords, in which steel cords included in at least one of these main belt layers satisfy conditions that a cord diameter is. the same in this layer but different from that of the remaining main belt layer, and a ratio of cord diameter in these main belt layers is within a range of 1.2-3.0, and a ratio of total breaking load of cords in these main belt layers per unit width is within a range of 1.1-2.0 times.

Abstract: A multi-layer circumferentially reinforced radial pneumatic light truck tire having a belt structure of at least two layers of 2+2x.35ST cord for Load Range E.

Abstract: A high performance pneumatic radial tire includes a tread with plural circumferential grooves, a radial carcass, a belt composed of two belt layers of metal cords, one additional reinforcing layer arranged on a radially outer side of the belt and on an axially central area of the tread, and at least two additional auxiliary layers arranged on each of widthwise opposite side portions of the tread and composed of organic fiber cords. The additional reinforcing layer is composed of cords crossing the metal cords in the belt layer adjacent thereto and inclined with respect to the tire-circumferential direction, and has a width smaller than a minimum width of the belt but greater than a distance between the circumferential grooves located on widthwise outermost sides of the tread, respectively. The organic fiber cords composing at least two additional auxiliary layers extend substantially in the tire-circumferential direction, and at least two additional auxiliary layers have different widths.

Abstract: A high performance pneumatic radial tire comprises a toroidal carcass, a tread radially outside a crown portion of the carcass, a belt layer interposed between the carcass and the tread and having a same width of the tread, and an auxiliary layer arranged between the belt layer and the tread and covering the entire belt layer. organic cords are buried substantially parallel to an equatorial plane of the tire in the auxiliary layer, and land portions are defined between at least two circumferential main grooves formed in an outer surface portion of the tread and between the circumferential main grooves and axially opposite edges of the tread.

Abstract: A process for applying a belt structure during the manufacture of a large heavy duty tire such as for an earthmover machine including forming a belt band 5 obtained by adhering together two rubberized fabric strips 8, 9 so as to be laterally offset with respect to each other. Each strip has reinforcing cords 8a, 9a disposed according to symmetrically cross-biased orientations. A belt band made of at least two adhered together strips is wrapped on the carcass 2 of a tire being manufactured with one or more complete turns around the radial outer circumferential surface of the carcass. The end edges 5a, 5b of the belt band 5 are cut perpendicularly to the longitudinal axis thereof and are disposed to overlap each other with the amount of overlap ranging between 20 and 80 mm.