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

Abstract: A pneumatic tire having an improved off-road traveling performance, which has a block pattern that a plurality of blocks 7 are provided in a tread portion, in which each of the blocks 7 includes a tread surface 9 facing radially outward and a wall surface 10 extending radially inwardly from the edge “e” of the tread surface 9, and at least one of the blocks 7 is provided with at least one recess portion 11 which extends on the wall surface 10 in the radial direction, and whose radially outer end opens at the tread surface 9 and whose length L along the wall surface 10 is from 10 to 70% of the height BL of the blocks 7.

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 pneumatic tire for motorcycle includes a tread portion; a pair of sidewall portions; and bead portions, wherein a ground contact region of the tread portion has five regions including a center region including the tire equatorial plane; a pair of shoulder regions including ground contact ends of the tread; and a pair of intermediate regions located between the center region and the respective shoulder regions. At a room temperature of 25° C., 100% modulus of intermediate tread rubber provided across the entire part of each intermediate region is set larger than each of 100% modulus of center tread rubber and 100% modulus of shoulder tread rubber, and a negative ratio in the ground contact region of the tread is set so as to gradually increase from the respective shoulder regions toward the center region.

Abstract: A tire suitable for off road use has blocks on its sidewalls that add thickness to the sidewall for added protection from debris tending to puncture the sidewalls. The blocks have sloping surfaces that protect the blocks from snagging or tearing from the sidewall. The blocks have surfaces designed to grip sides of ruts and are arranged in concentric patterns with overlapping for greater traction and good weight distribution when running at zero pressure.

Abstract: The present invention provides a pneumatic tire for a motorcycle which improves driving performance and braking performance without degrading driving stability particularly when a middle camber angle is applied to the tire. This tire comprises a tread portion 1, side wall portions 2 and bead portions 3, wherein this tread portion 1 comprises five regions of a central region A, shoulder regions C and intermediate regions B and 100% modulus of at least a portion forming the ground contact surface of intermediate tread rubber 7b disposed over the entire region of the intermediate regions B is larger than both of 100% modulus of at least a portion forming the ground contact surface of central tread rubber 7a disposed over the entire region of the central region A and 100% modulus of at least a portion forming the ground contact surface of shoulder tread rubber 7c disposed over the entire region of the shoulder regions C.

Abstract: A tire (2) for a motorcycle includes a tread (4). The tread (4) has a center region (18), a pair of shoulder regions (20) and a pair of middle regions (22). In straight running, the center region (18) mainly comes in contact with a road surface. In cornering, the shoulder region (20) mainly comes in contact with a road surface. A modulus (Mm) of a rubber composition in the middle regions (22) is lower than a modulus (Mc) in the center region (18) and is higher than a modulus (Ms) in the shoulder regions (20). A ratio ((Mc?Mm)/(Mm?Ms)) is equal to or higher than 1/3 and is equal to or lower than 3/1. A ratio (Wm/W) is equal to or higher than 0.3 and is equal to or lower than 0.8. A ratio (Wc/W) is equal to or higher than 0.1 and is equal to or lower than 0.4. A ratio (Ws/W) is equal to or higher than 0.1 and is equal to or lower than 0.4.

Abstract: An off-road motorcycle tire having a block pattern comprising a plurality of blocks 11 defined by tread grooves 10, each block 11 having a circumferential profile 16 of top surface 12 in the form of a straight line or a circular arc having a radius Ra of curvature of at least 500 mm, in which the circumferential profile denotes a profile in the circumferential section which passes through the centroid G of the top surface 12 and is parallel to the tire equatorial plane Cc. According to the invention, the ground contact pressure at the periphery of the top surface of blocks 11 is prevented from lowering to enhance the edge effect.

Abstract: A pneumatic tire has a pair of bead portions, side wall portions extending to an outer side in a tire diametrical direction from the bead portions, and a tread portion connected to an outer end in a tire diametrical direction of each of the side wall portions. An outer wall surface of the side wall portion is provided with a circumferential projection annularly extending along a tire circumferential direction, and a plurality of diametrical projections extending to an inner side in a tire diametrical direction from the circumferential projection and arranged so as to be spaced in the tire circumferential direction. A gap portion formed between the diametrical projections is open to an inner side in the tire diametrical direction.

Abstract: This invention provides a pneumatic tire for a two-wheeled vehicle with improved lateral grip at cornering, controlled tread wear in the shoulder regions, ensured uniformity of wear on the left and the right, and secured heat generation in the tread on an actual vehicle. The pneumatic tire has left and right dissimilar rubber layers (15b, 15c) disposed in an inner layer of the tread in the left and right shoulder regions (16), respectively.

Abstract: A pneumatic tire for motorcycle capable of increasing peel resistance of a joint portion between regions against a larger lateral force when a camber angle is large, characterized in that each approximate straight line at a meridional section of join lines between a central tread rubber 7a and an intermediate tread rubber 7b and between the intermediate tread rubber 7b and a shoulder tread rubber 7c is extended obliquely in a direction of intersecting a phantom extended line of the each approximate straight line with the tire equatorial plane inside the tire, and an intersecting angle ? of the approximate straight line j2 of the join line between the intermediate tread rubber 7b and the shoulder tread rubber 7c with a tangential line drawn to a joint point of these tread rubbers at a ground contact surface and located at the side of the tire equatorial plane is smaller than an intersecting angle ? of the approximate straight line j1 of the join line between the central tread rubber 7a and the intermediate tre

Abstract: An object of the present invention is to provide a pneumatic tire excellent in running performance on a rough road. In order to achieve the object, a pneumatic tire comprises a tread surface having a plurality of lug grooves each of which opens to a sidewall, the sidewall includes a plurality of protrusions disposed thereon, wherein each of the lug grooves includes a protruding strip portion disposed on a groove bottom of the lug groove and extending along an extending direction of the lug groove, the protruding strip portion has a start point thereof at an inner side than a ground-contact point in a width direction as viewed from a front side thereof, and extends up to one of the protrusions beyond an open end of the lug groove located at the sidewall side and is connected to the protrusion.

Abstract: A new kind of tire utilizes a replaceable tread surface to enable variable tread characteristics determined by a removable riding surface. The tire body defines a slot that extends circumferentially around the tire and receives the removable riding surface. The removable riding surface is attached within the slot by attachment mechanisms. In other embodiments, the variable tread is accomplished via a removable sleeve that fits over the existing tire.

Abstract: Pairs of motorcycle tires and a method for improving performance and resistance to wearing, consists of a tread including grooves, the tread consisting of a central area, sided by intermediate side areas and by projection areas, the latter being adjacent to the external borders of such tread. The sea/land ratio in the central area of the front tire is between 15% and 30%; the sea/land ratio in such central area of the rear tire is substantially lower than that of the other areas of the tire, the value being lower than 70%; the sea/land ratio in the intermediate side areas of the front tire and rear tire is between 20% and 40%; and the sea/land ratio in the projection areas of the front tire and rear tire is between 10% and 30%.

Abstract: The present invention aims to provide a pneumatic tire for a motorcycle capable of improving turning performance on a wet road surface as compared to that of conventional tires. The pneumatic tire for a motorcycle comprises a tread 28 consisting of a tread central portion having a width of 60% of a tread developed width and tread side portions located outside of the tread central portion in the width direction of the tire and a plurality of wide inclined grooves 42 and narrow inclined grooves 44 inclined at an angle of less than 90 degrees with respect to the circumferential direction of the tire formed in the tread side portion such that the grooves continuously extend over a region of 50% or more of a width of the tread side portion. A groove width of the narrow inclined grooves 44 is set within a range between 0.3 mm and 2.5 mm. A total area of the wide inclined grooves 42 is set to not more than 20% of an area of the tread side portion.

Abstract: A tire has a first and second beads mounted on a rim. A first sidewall extends upward from the first bead to a first edge of a horizontal tread face located substantially directly above the first bead. A second sidewall extends upward from the second bead and curves toward a second edge of the tread face such that a curved tire surface is provided between the second bead and the second edge of the narrow tread face. Two tires are mounted on a rear motorcycle axle such that a gap is defined between first sidewalls of the right and left tires, and a drive extends through the gap to the axle. When the motorcycle is leaned in a curve, one of the wheels is above the ground surface, and the motorcycle is supported on the curved tire surface of the other tire.

Abstract: There is provided a pneumatic radial tire for a motorcycle enabling safe running the motorcycle in conformity to various road conditions by achieving both performances of wet performance, i.e., hydroplaning and traction performances in particular, and linearity in handling at high level. In the pneumatic radial tire for a motorcycle, (a) tilt lug grooves are disposed at a tilt angle of 5 to 85° relative to a tire circumferential direction, (b) a ratio of the minimum length Lmin thereof to the surface length W thereof along one side of a tread is 0.

Abstract: The present invention aims to improve the durability of a motorcycle pneumatic tire in which a tread portion is formed by a rubber strip-laminating body and to provide a method of producing such tire. A pneumatic tire 1 for a motorcycle has a tread portion 5 consisting of a rubber strip-laminating body 8 formed by continuously and spirally winding a rubber strip 11 in the tire circumferential direction. An imaginary extended plane p of an outermost layer 10a of the rubber strip-laminating body 8 forming the surface 9 of the tread portion defined by extending a boundary between the rubber strips constituting the outermost layer from the surface 9 of the tread portion to the outside of the tire is situated in a tread end side with respect to a normal line n of the surface 9 of the tread portion.

Abstract: The present invention provides a pneumatic tire for a motorcycle capable of satisfying all of high-speed durability, turning performance and slide controllability. The invention relates to a pneumatic tire 10 for a motorcycle having a bead core 12, a carcass 14, a tread rubber 18, a side rubber 26 and a spiral belt 30. The number of cords Nmc in the spiral belt 30 in the center area is set to 30 to 70/50 mm, and the number of cords Nms in the spiral belt 30 in the shoulder area is set to 10 to 45/50 mm (Nmc/Nms=1.5 to 3.0). The tread rubber 18 is set to tan ?/E?=0.06 to 0.14 MPa?1 in the center area CA and the tread rubber 18 is set to tan ?/E?=0.12 to 0.16 MPa?1 in the shoulder area SA (TEc/TEs=0.4 to 0.9).

Abstract: An off-road motorcycle tire having a block pattern comprising a plurality of blocks 11 defined by tread grooves 10, each block 11 having a circumferential profile 16 of top surface 12 in the form of a straight line or a circular arc having a radius Ra of curvature of at least 500 mm, in which the circumferential profile denotes a profile in the circumferential section which passes through the centroid G of the top surface 12 and is parallel to the tire equatorial plane Cc. According to the invention, the ground contact pressure at the periphery of the top surface of blocks 11 is prevented from lowering to enhance the edge effect.

Abstract: An off-road tire for motorcycle comprises a tread portion provided with a plurality of blocks including an axially outmost shoulder block, a pair of sidewall portions, and a pair of bead portions, the shoulder block comprising a tread face with an axially outer edge corresponding to a tread edge and a lateral face extending from the tread edge to an radially inner edge located on the sidewall portion, the lateral face with a swelling portion swelling axially outside of the tire than a reference line which connects the tread edge and the radially inner edge, in a cross section including a tire axis, and the radial height of the radially inner edge of the lateral face from the bead base line being in a range of from 30 to 50% of the tire section height.

Abstract: In a pneumatic tire for a motorcycle where grooves 30, 31 (inclined portion 32) extending generally in a width direction are formed on an outer surface of a tread portion 13 and a rotational direction is designated, driving performance or braking performance is improved. Driving force affects on a tire for a rear wheel during accelerated running, so that an entire land portion 35 between the inclined portions 32 is about to lean backwardly in the rotational direction. However, the inclined portion 32 is generally inclined forwardly in the rotational direction from a deepest point D toward an opening end K, so that a support portion 36 formed at a rear end of each land portion 35 in the rotational direction and having a substantially triangular shape strongly resists the leaning, thereby effectively suppressing the leaning of each land portion 35. As a result, grip force during driving is improved, thereby improving driving performance.

Abstract: The invention relates to a method of making an outer tire layer on a pneumatic tire microcellular closed-cell sponge rubber, method of making the aforesaid product.

Abstract: A motorcycle tire is provided that is capable of remarkably improving a traction characteristic and an anti-sideslip characteristic for cornering without deteriorating the mud expulsion characteristic especially on a dirt road. In embodiments, a motorcycle tire has a plurality of main blocks scattered on a tread. Sub blocks are provided between the main blocks. The sub blocks are made of rubber and have a block height H2 lower than that the height H1 of the main blocks. A part of the rubber constituting a top portion of the sub block is removed to reduce the area of a upper face of the sub block.

Abstract: To provide a pneumatic tire for a motorcycle in which both wear resistance and wet steering stability can be attained. Since a pair of zigzag circumferential direction grooves 28 are positioned at the center of a tread central region 24C and has an amplitude, even when a certain camber angle is exceeded, an occurrence of a sudden separation of the zigzag circumferential direction groove 28 from a road-contact surface 26 can be prevented, whereby deterioration of wet steering stability can be suppressed. When the camber angle increases, water in a road-contact surface 26 is drained by inclining grooves 32 which are arranged at an external side of the zigzag circumferential direction groove 28. Since sharp inclining groove portions 32A of the inclining grooves 32 are positioned in the tread central region 24C, and no lug groove components are employed, circumferential direction rigidities of land portions in the tread central region 24C are high and exhibits excellent wear resistance.

Abstract: This invention relates to a rubber composition prepared with reinforcement comprised of a combination of precipitated silica aggregates and pelletized rubber reinforcing carbon black composites of carbon black and organic binder of a controlled hardness and to a tire with at least one component comprised of and derived from such rubber composition in which said carbon black pellet composites are disintegrated (fragmented) in situ within said rubber composition in the presence of particulate precipitated silica and silica coupling agent. In one aspect the invention relates to a tire having a component of a rubber composition comprised of at least one conjugated diene-based elastomer and reinforcing filler comprised of a combination of precipitated silica, silica coupling agent and fragmented rubber reinforcing carbon black pellet composites, said pellets having a controlled hardness value.

Abstract: A tire for a motorcycle wherein the radius of curvature (R1) of a corner portion on one side (an inside in an axial direction) of a groove of the tire is smaller than a radius of curvature (R2) of the other corner portion; the radii of curvature (R1) and (R2) are set to be 2 mm or more; a first phantom circle for defining the corner portion is inscribed on a second phantom circle for defining the corner portion; the point of contact of the first phantom circle and the second phantom circle is positioned on the outside from the center of a groove; and the distance between the center of the groove and the point of contact is equal to or smaller than one fifth of the width (B) of the groove.

Abstract: The present invention, in one embodiment, is a method of making a tire with a skin covering at least a portion of the outer peripheral surface of the tire. In practicing the method, a partially cured tire and a partially cured skin are provided. The partially cured tire and the partially cured skin are installed in a tire mold with the skin engaging and covering at least a part of the outer surface of the tire and with the skin facing an inner surface of the mold. Heat and pressure are applied to the tire to press the skin and the tire against the inner surface of the mold. The heat and pressure are maintained for a predetermined time period to vulcanize and bond together the tire and the skin.

Abstract: A bicycle tire 10 is described having a tread that comprises transverse channels defining a block tread pattern for improving grip when the tire is used in off-road conditions. Two axially spaced circumferentially continuous parallel ribs 14 straddle the tire centreline and project radially beyond the block tread pattern to improve ride quality on a smooth road surface.

Abstract: A motor-cycle tire (1) comprising a ground contacting tread (2) reinforced between its edges (3,4) by a breaker assembly and having in its normally inflated fitted condition a camber value C/L of between 0.5 and 0.

Abstract: In the method of mounting a pneumatic radial tire comprising a spiral belt and a pair cross belt members arranged in parallel to each other at both sides of an equational plane of the tire and at a given opening space onto a vehicle body, the tire is mounted as a front tire and/or a rear tire so as to contact a portion of the cord in the belt member facing the opening space with ground under a given condition in a forward rotating direction of the tire.

Abstract: This invention relates to a pneumatic rubber tire having a circumferential rubber tread of a lug and groove configuration which extends to a substantial portion an adjacent rubber sidewall and is designed to be ground-contacting. Said lug and groove configured portion of said sidewall is of a rubber composition comprised of a blend of cis 1,4-polyisoprene natural rubber and cis 1,4-polybutadiene rubber which contains reinforcement as carbon black, starch/plasticizer composite and aggregates of participated silica together with a coupling agent. Said circumferential rubber tread is of a rubber composition comprised of at least one diene-based rubber together with carbon black reinforcement and is exclusive of starch and precipitated silica.

Abstract: A tire 10 for a bicycle is described having a tread that comprises transverse channels defining a block tread pattern for improving grip when the tire is used in off-road conditions. Two axially spaced circumferentially continuous parallel ribs 14 straddle the tire centreline and project radially beyond the block tread pattern to improve ride quality on a smooth road surface.

Abstract: Pneumatic tire, particularly a two-wheeler pneumatic tire, such as a bicycle tire, which includes at least one rubberized casing that is anchored in beads by wrapping bead cores. A tread is provided. An outer covering has a layer thickness of less than or equal to 0.5 mm. The outer covering has a high tear resistance and extends at least over the tread.

Abstract: A high-transverse-curvature tire (1), in particular to be mounted on the front wheel of a motor-vehicle, which includes a belt structure (6) including, in a radially external layer (9a), a plurality of circumferential coils (7a), axially arranged side by side, of a cord (7) wound at a substantially zero angle with respect to the equatorial plane (X—X) of the tire. An area occupied by rubber blocks (10) formed in a portion of the tread band (8), having a length equal to the pitch (p) of the tread pattern and a width equal to the axial development of the tread band (8), is between 70% and 90% of the total area of the portion.

Abstract: A pneumatic tire has a tread portion curved so that the maximum section width of the tire lies between tread edges. The tread portion is provided with central blocks arranged circumferentially of the tire at pitches P1, axially outer blocks arranged circumferentially of the tire at pitches P3, and middle blocks arranged circumferentially of the tire at pitches P2 between the central blocks and axially outer blocks: the pitches P1 have a longer length than the pitches P2 and the central blocks, and the middle blocks are substantially aligned every two or more (number n) pitches P1; two or more circumferential positions at which the central blocks and the middle blocks are substantially aligned are provided around the tire; circumferential positions of the axially outer blocks are between the middle blocks.

Abstract: A radial tire for motorcycles comprises a carcass extending between bead portions through a tread portion and sidewall portions, and a belt disposed radially outside the carcass in the tread portion and comprising two cross breaker plies of cords laid at angles of from 16 to 26 degrees with respect to the tire equator. And the method of making the radial tire comprises vulcanizing the tire in a mold which causes a variable stretch to the belt during vulcanizing the tire, wherein the stretch at the tire equator is in a range of from 6.0 to 7.0%, and the stretch gradually decreases from the tire equator to the axial edges of the belt. The stretch is defined as (BD2/BD1−1)×100 wherein BD1 is the inside diameter of the belt before tire vulcanization, and BD2 is the inside diameter of the belt during tire vulcanization.

Abstract: A tire structure for a bicycle includes a tire body having an outer periphery, and a tread integrally formed on the outer periphery of the tire body. The tread includes an inner layer having a first color, and an outer layer coated on the inner layer and having a second color different from the first color. The outer layer formed with a plurality of openings, thereby exposing the inner layer outward from the outer layer through the plurality of openings. In such a manner, the inner layer and the outer layer of the tread present at least two different colors, thereby increasing the aesthetic quality of the tire structure of the bicycle.

Abstract: In a high-transverse-curvature tire (1), in particular to be mounted on the front wheel of a motor-vehicle, comprising a belt structure (6) including, in a radially external layer (9a), a plurality of circumferential coils (7a), axially arranged side by side, of a cord (7) wound at a substantially zero angle with respect to the equatorial plane (X-X) of the tire, the area occupied by rubber blocks (10) formed in a portion of the tread band (8) having a length equal to the pitch (p) of the tread pattern and a width equal to the axial development of the tread band (8), is between 70% and 90% of the total area of said portion. Such a tire (1) advantageously couples a substantial reduction in the shimmy effect with a good wet grip and a reduction in both the braking distance and aquaplaning phenomena on wet road.

Abstract: An all terrain vehicle tire (10) has an annular tread (12) and a casing (11) radially inward of the tread (12). The tread (12) has a plurality of tread lugs (92, 94) and a central rib (95). The plurality of tread lugs (92, 94) are disposed on each tread half and spaced axially from the equatorial plane of the tire (10). The spacing from the equatorial plane of the tire (10) is a distance of at least 10% of the tread width. The central rib (95) is located between the plurality of tread lugs (92) on each tread half. The central rib (95) has a nonskid depth as measured from the inner tread surface of less than the maximum nonskid depth of the tread lugs (92, 94). The preferred embodiment tire (10) has a pair of inserts (42), one insert (42) being in each sidewall (18, 20) of the tire (10) and a third insert (70) disposed between a breaker reinforcing structure (36) and at least one ply reinforcing structure (38) of the casing (11).

Abstract: A motor-cycle tire (1) comprising a ground contacting tread (2) reinforced between its edges (3,4) by a breaker assembly and having in its normally inflated fitted condition a camber value C/L of between 0.5 and 0.

Abstract: A pneumatic radial tire capable of effectively controlling the occurrence of wandering phenomenon when being used in vehicles such as passenger car, small-size truck, truck, bus and the like is provided, in which a second tread zone contacting with a mountain side of a slant road surface is arranged so as to project toward a side of a first tread zone contacting with a flat road surface and camber thrust of the radial tire is increased by the second tread zone during the running on ruts and the like under loading.

Abstract: A pneumatic tire for a front wheel of a motorcycle comprises a pair of bead cores, a radial carcass toroidally extending between the pair of bead portions, a belt disposed on a radially outer surface of the carcass, and a tread portion disposed thereon, wherein the carcass is comprised of at least one carcass ply containing organic fiber cords, and the belt is a spiral belt layer formed by spirally winding a continuous rubberized cord or a continuous ribbon-shaped body containing plural cords therein in a widthwise direction of the tire, and the tread portion has a two-layer structure comprised of a cap rubber layer and a base rubber layer in at least a central region in the widthwise direction of the tire, or a reinforcing layer is disposed inside an innermost carcass ply or on an inner surface of an innerliner, or the bead core is a helically wound laminate of a single steel wire having a polygonal shape at a section of the bead core in the radial direction.

Abstract: A high-transverse-curvature tire (1), in particular for mounting onto the rear wheel of motor-vehicles, comprises a tread band (8), coaxially extended around a belt structure (6), wherein a plurality of rubber blocks (10), defined between a plurality of grooves (1 1) extending along a direction substantially transverse to the tire running direction (D), are formed which grooves comprise a bottom (12) connected to opposite inlet (13) and outlet (14) sidewalls. In an equatorial zone (E) of the tread band (8), the inlet wall (13) of the grooves (11) is inclined with respect to the bottom (12) of the same towards the tire rolling direction, and forms an angle (&agr;) of from 50° to 80° with respect to a plane (&pgr;) tangent to the bottom (12).

Abstract: A pneumatic radial tire for motorcycle comprises a belt containing cords extended substantially in a circumferential direction of a tread and has a directional tread pattern defined by plural main slant grooves having a given inclination angle with respect to the circumferential direction and extending from a tread center up to a tread shoulder region and a slant sub-groove arranged between the slant main grooves and having an inclination angle smaller than that of the slant main groove, in which the slant main groove has a given width in connection with a periphery length between both ends of the tread at a particular posture under a given air pressure; a main portion of the slant sub-groove is terminated so as not to open into the slant main groove and has given groove width, length in the circumferential direction of the tread, and depth.

Abstract: A motorcycle tire comprises a tread portion curved convexly such that the maximum cross section width TW of the tire lies between the tread edges, a carcass ply of cords arranged radially at an angle of 70 to 90 degrees to the tire equator, and a belt ply of at least one cord laid at an angle of 0 to 35 degrees disposed radially outside the carcass ply in the tread portion. When the tire is mounted on a standard rim and inflated from 10% of a standard inner pressure to 100% thereof, the tread portion swells such that the amount of swelling is larger in a shoulder region than a crown region of the tread portion. The carcass cord tension Tcs in the shoulder region is 2.0 to 3.8 times the carcass cord tension Tcc in the crown region, and the belt cord tension Tbs in the shoulder region is 1.2 to 2.0 times the belt cord tension Tbc in the crown region.

Abstract: A tire for two-wheeled vehicles is described, said tire having a transverse curvature coefficient with a value of not less than 0.15, comprising a torus-shaped carcass having structural means which allow improvements in the handling of the vehicle, while leaving unchanged the other performance characteristics, in particular the comfort. These structural means consist in at least one ply of a rubberized fabric provided with textile cords having a count of between 420/2 and 840/2 dtex and a modulus of elasticity of between 100,000 MPa/cm and 200,000 MPa/cm. Preferably the carcass comprises a pair of these rubberized fabric plies reinforced with PEN cords.

Abstract: A pneumatic tire for a two-wheeled vehicle having high lateral stiffness and exhibiting improved steering stability has a tread pattern defined in a tread portion by numerous sets of combination lug groove patterns. In this tread portion, one set of the left and right sides of the lug groove patterns is reverse W-shaped as a whole in the tire rolling direction, each of mid bending points P on both sides of the reverse W-shape is arranged at the region of 20-80% of a tire tread half width TW from a tire central circumferential line EC, an angle of the lug groove component to a tire shoulder portion from the mid bending point P is 20-70° with respect to a tire equatorial plane E, and an angle of the lug groove component to the tire central circumferential line EC from the bending point P is 20-70° with respect to the tire equatorial plane E.

Abstract: A tire for a two-wheeled vehicle comprising a ground contacting tread having at least one tread groove formed therein and extending axially from the tread center to the tread edge, wherein in a first region of the tire tread, which is the central tread region and is the region of contact between the tire and the ground when the motorcycle is in the condition of moving in a straight line, the alignment of the tread groove is substantially circumferential, and in a second region of the tire tread, which is at the axial edge of the tread and is the region of contact when the motorcycle is in the condition of turning under maximum cornering, the alignment of the tread grooves is substantially transverse, and in a third region, which is the tread region between the first central region and the second axial region and which is the ground contacting region when the motorcycle is turning at less than the maximum cornering condition, the groove alignment changes progressively axially outwardly from substantially circu

Abstract: A pneumatic radial tire capable of effectively controlling the occurrence of wandering phenomenon when being used in vehicles such as passenger car, small-size truck, truck, bus and the like is provided, in which a second tread zone contacting with a mountain side of a slant road surface is arranged so as to project toward a side of a first tread zone contacting with a flat road surface and camber thrust of the radial tire is increased by the second tread zone during the running on ruts and the like under loading.