Abstract: A cord arranging method using a guide roller and capable of forming annular cord structures of various shapes is disclosed. A guide roller 30 is moved along the surface of a rotating core 13 to guide a continuously fed cord 1 to a continuously changing position on the surface of the core 13 to wind the cord 1 in successively and closely arranged coils to form an annular cord structure. The guide roller 30 is moved two-dimensionally along the surface of the core 13, and the angular position of the guide roller 30 is regulated such that the guide roller 30 presses the cord 1 against the surface of the core 13 always perpendicularly to the surface of the core 13.

Abstract: In a belt layer structured by a plurality of zigzag endless belts which are layered in a tire radial direction and are folded-over at both ends in a tire widthwise direction and are disposed uniformly over an entire region, an angle ?1 of an inner side cord portion and a tire equatorial plane, an angle ?2 of an outer side cord portion and the tire equatorial plane, and an angle ?M of an intermediate cord portion and the tire equatorial plane, are ?1>?M>?2.

Abstract: A motorcycle tire includes at least one carcass-type reinforcement structure formed of reinforcement elements, anchored on either side of the tire to a bead whose base is intended to be mounted on a rim seat, each bead being extended radially towards the outside by a sidewall. The sidewalls meet up radially towards the outside with a tread. Under the tread there is a crown reinforcement structure including at least one layer of reinforcement elements known as a working layer which has at least one continuous reinforcement cord forming portions in the central zone thereof. Those central cord portions display identical angles of between 10-80 degrees formed with the longitudinal direction, the angles being measured at points of intersection of the cord with a circumferential plane. Two adjacent cord portions are linked by a U-shaped loop.

Abstract: A carcass ply is applied around an outer surface of a building drum, according to an application diameter greater than the fitting diameter of the tyre. An annular anchoring structure defining the fitting diameter is coaxially engaged around each of the end flaps. A n outer sleeve including at least one belt structure possibly associated with a tread band is disposed at a coaxiaily centred position around the carcass sleeve applied onto the building drum. Through axial approaching of two halves forming the building drum, the carcass sleeve is shaped into a toroidal configuration to determine application of same against a radially internal surface of the outer sleeve.

Abstract: A process for manufacturing a tyre includes: providing a first plurality of strip-like elements, each substantially having a first effective width; providing at least a second plurality of strip-like elements, each substantially having a second effective width; arranging the strip-like elements of the first plurality and of the second plurality on a support by approaching side edge portions thereof to one another, so as to form at least one reinforcing component of the tyre on the support; wherein the first effective width is different from the second effective width.

Abstract: A process for producing a tire, in which a tire improved in qualities, such as uniformity and weight balance, is produced through inhibiting of rubber lumping under the influence of gravitational force at the time of initiation of rubber discharge.

Abstract: The present invention provides a method of producing a tire component member, which method allows rubber strip pieces to be sequentially attached without forming a gap therebetween.

Abstract: When a sidewall portion is formed with a white line or character having different color from that of a main body rubber, a rubber ribbon is wound along a circumferential direction of the tire a plurality of times, a black sidewall rubber provided with a concave groove extending in the circumferential direction of the tire is formed in a region where the white line or character is to be formed, an integrally extruded white rubber extrudate is fitted into the concave groove, the white rubber extrudate is covered with a black rubber sheet, the rubber sheet is partially cut down to expose the white rubber extrudate.

Abstract: A mechanism for laying a strip on a receiving surface rotating about a first axis. The mechanism includes a laying head moving along a second axis oriented parallel to the axis of rotation of the surface and along a third axis oriented parallel to a radial direction passing through the point of contact between the receiving surface and a strip applicator of the laying head. The laying head is rotatable about a front axis oriented substantially perpendicular to the second and third axes and passing through the contact point. the laying includes a device for estimating the value of the of the angle ? formed by a tangent to the transverse profile of the surface and the second axis. The movements of the laying head are determined by the value of the angle ? in such a way as to displace the laying head in a direction parallel to the tangent following the transverse profile of the receiving surface.

Abstract: An object is to reduce a cycle time for fabricating a low rolling resistance pneumatic tire and to provide the same pneumatic tire. As a means therefor, in building a tread portion by winding spirally a rubber strip material whose cross section is divided into a first region made of a conductive rubber and a second region made of a non-conductive rubber in a tire circumferential direction in a partially overlapping fashion by the use of an extruding machine which extrudes continuously the rubber strip material, an area ratio of the first region relative to the cross section of the rubber strip material is made to change in a tire width direction.

Abstract: The invention can efficiently provide a carcass member constituting a carcass layer of a radial tire, particularly, a carcass member a direction of a cord of which constitutes an angle of substantially 90° relative to a tire circumferential direction, and can easily adjust a length in accordance with a size, one piece of a cord (C) is continuously passed through a rubber coating die (14) to coat rubber on the cord, the rubber coated cord (C1) is shaped such that a sectional outer shape thereof constitutes an elliptical shape, the rubber coated cord (C1) is wound around an aligning drum (30) while adjusting a direction of the elliptical shape by way of an aligning guide (20) to bond without producing a gap to form a cylinder-like member (A1), thereafter, the cylinder-like member (A1) is cut in a direction in parallel with the drum axis center to constitute a sheet-like shape.

Abstract: A method for manufacturing a tyre for vehicle wheels includes the steps of building a carcass structure, including at least one carcass ply associated with annular anchoring structures, on a forming support, building a belt structure in a radially outer position with respect to the carcass structure and building a tread band in a radially outer position with respect to the belt structure, wherein the at least one carcass ply, the annular anchoring structures and the belt structure each include at least one reinforcing element deposited in a radially outer position with respect to the forming support.

Abstract: A method for manufacturing a tyre for vehicle wheels, includes a carcass structure having at least one carcass ply associated with axially opposite annular anchoring structures. The method includes the steps of manufacturing at least one pair of annular anchoring structures of the carcass structure and associating the pair of annular anchoring structures with the at least one carcass ply at axially opposite end flaps of the carcass ply. The step of manufacturing each annular anchoring structure includes the steps of manufacturing a bead core and coating the bead core with a reinforcement tape through an apparatus. The step of coating the bead core includes the steps of winding the reinforcement tape onto the bead core moving a tape deposition member with respect to the bead core. The step of manufacturing the annular anchoring structure further includes a step of loading the reinforcement tape onto the tape deposition member.

Abstract: A pneumatic tire containing a tread, a carcass having at least one belt ply disposed below the tread, and a cap ply located between the carcass and the tread. The cap ply comprises at least one layer of an open construction leno weave tape having a pair of warp yarns in the longitudinal direction and a weft yarn in the weft direction. The pair of warp yarns comprises a first warp yarn and a second warp yarn, where the second warp yarn has a force of elongation of between about 1 and 40% the force of elongation of the first warp yarn, where the second warp yarn is in tension, and where the second warp yarn has an elongation at break of greater than 2%. The leno weave tape is disposed in a flat pattern around the circumference of the carcass in the area of the belt ply. A method of making a pneumatic tire is also disclosed.

Abstract: A pneumatic tire containing a tread, a carcass having at least one belt ply disposed below the tread, and a cap ply located between the carcass and the tread. The cap ply comprises at least one layer of an open construction leno weave tape having a pair of warp yarns in the longitudinal direction and a weft yarn in the weft direction. The pair of warp yarns comprises a first warp yarn and a second warp yarn, where the second warp yarn has a force of elongation of between about 1 and 40% the force of elongation of the first warp yarn, where the second warp yarn is in tension, and where the second warp yarn has an elongation at break of greater than 2%. The leno weave tape is disposed in a flat pattern around the circumference of the carcass in the area of the belt ply. A method of making a pneumatic tire is also disclosed.

Abstract: A pneumatic tire containing a tread, a carcass having at least one belt ply disposed below the tread, and a cap ply located between the carcass and the tread. The cap ply comprises at least one layer of an open construction leno weave tape having a pair of warp yarns in the longitudinal direction and a weft yarn in the weft direction. The pair of warp yarns comprises a first warp yarn and a second warp yarn, where the second warp yarn has a force of elongation of between about 1 and 40% the force of elongation of the first warp yarn, where the second warp yarn is in tension, and where the second warp yarn has an elongation at break of greater than 2%. The leno weave tape is disposed in a flat pattern around the circumference of the carcass in the area of the belt ply. A method of making a pneumatic tire is also disclosed.

Abstract: During building of a tyre, at least one component of elastomeric material is manufactured through application of an elongated element in the form of coils disposed side by side and/or superposed onto a forming support driven in rotation and transversely moved in front of an applicator device. The elongated element is formed by feeding a continuous thread element coming from an extruder between two shaping rollers. During formation, a detector operating close to the shaping rollers cyclically detects the width of the elongated element and the cross-section area of the continuous thread element to monitor the volumetric flow rate of the continuous thread element close to the shaping rollers. The feeding speed of the continuous thread element toward the shaping rollers is adjusted through feedback on the extruder or on a driving device operating downstream of the extruder itself, to keep the volumetric flow rate value within a predetermined range.

Abstract: Provided are a pneumatic tire with a durability which is improved by preventing oxygen deterioration of coating rubber of a reinforcement layer, and a method of manufacturing the pneumatic tire. The pneumatic tire according to the present invention is a pneumatic tire including a reinforcement layer having reinforcement cords. In the pneumatic tire, the reinforcement layer is covered with thin films each made of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending a thermoplastic resin with an elastomer in a way that the reinforcement is wrapped with the thin films.

Abstract: It is a subject to provide a method for manufacturing a tire rubber member and a pneumatic tire using the same capable of improving productivity and of accurately finishing sectional shapes.

Abstract: A tyre building machine (1) comprises a rotatable drum (2), to which strips of material (7) can be applied. Strips of material (7) are transported to the drum (2) by means of conveyors (3). The run of the pieces of material (7) transversely in relation to the running direction is sensed by means of a first sensor (9) and fed to a position controlling device (12). To compensate for machine- or transfer-induced errors, at least one second sensor (16), which senses the position of the strip of material (7) transversely in relation to the running direction, is provided in the region of the drum (2). An output signal of this second sensor (16) is in operative connection with the position controlling device (12) to correct the setpoint value correspondingly (FIG. 1).

Abstract: The feeding apparatus is provided with a first feeding section for feeding a long-formed sheet in the longitudinal direction of the sheet, a second feeding section for feeding the long-formed sheet delivered from the first feeding section in a direction intersecting obliquely with the feeding direction of the first feeding section and a control section for controlling the first feeding section and the second feeding section so that the second feeding section starts to operate before the leading end of the long-formed sheet delivered from the first feeding section is in contact with the second feeding section.

Abstract: In tyre manufacture, a belt structure is made by means of strip-like segments each including parallel cords incorporated into an elastomeric layer, which strip-like segments are sequentially laid down in mutual circumferential side by side relationship on a toroidal support.

Abstract: During manufacture of a tyre for motor vehicles, one or more structural elements of elastomeric material, such as a tread band provided with a respective under-layer, are manufactured by laying a continuous elongated element on the carcass structure or other forming support, which elongated element is longitudinally divided into a first and second mutually-coupled portions that are obtained through extrusion of two different elastomeric materials coming from respective extruders leading to a common extrusion die. Laying of the coils takes place in such a manner that the first and second materials form a first layer and a second layer overlapping the first layer, respectively.

Abstract: A pneumatic tire having a portion formed by laminating a rubber ribbon exhibits improved durability due to reduced propagation of cracks from the surface of the laminated portion of the rubber ribbon at a sidewall, for example. A pneumatic tire includes a laminated portion (40) formed by winding and laminating a rubber ribbon (50), and a surface layer (41) formed by bonding a rubber sheet on the outer surface of the laminated portion (40) at, for example, a sidewall (31). The surface layer (41) covers projections, recessions, and portions of adhesion failure on the laminated portion (40), and smoothes the surface of the tire, thus preventing cracking from propagating from the surface of the tire by tensile forces (P) and compressive forces (Q) during flexure.

Abstract: A device for laying reinforcement cords (41) of a tire. The device is formed of a first frame (1) comprising a motor-driven shaft (10) with an axis XX?, the motor-driven shaft (10) supporting a reference form on which the blank (4) of the tire rests. The first frame (1) itself is mounted rotatably about an axis ZZ? on a second frame (2) in such a manner that the axis ZZ? has a point of intersection with the axis of rotation XX? and belongs to the equatorial plane (E) of the blank (4) or of the reference form on which the blank rests. A third frame (3) is rigidly connected to the second frame (2), the third frame (3) supporting an apparatus (13) for laying the lengths of cords (41) by projection of the lengths of cords directly into their final position on the receiving surface formed by the tire blank (4).

Abstract: This invention provides a method for manufacturing a tire in which the time necessary for the manufacture can be reduced without deteriorating uniformity in manufacturing the tire by a strip-build process. The method for manufacturing the tire comprises discharging a strip rubber (S) having a predetermined sectional shape by rubber discharging devices (A1, A2) while rotating a molding drum (B), and successively winding the discharged strip rubber (S) around the molding drum (B) to mold the rubber into a tire shape.

Abstract: The invention can surely accomplish lamination without the generation of voids in building a tire constructed to comprise a plurality of rubber members for a tire when a ribbon-shaped rubber strip (R) is spirally wound and laminated, and uses holding rolls (30) and two sets of stitching rolls (40a), (40b) arranged in parallel with a center of a rubber strip width (W) therebetween to enable performing of an independent pressing motion, such that the rubber strip (R) is pressed and bonded by the holding rolls (30) in a position, in which the rubber strip (R) is wound, and the stitching roll (40a) or (40b) positioned fore in an advancing direction of traverse movement, out of the two sets, is caused to perform a pressing motion in a regional part just after the press whereby a fore part of the rubber strip in the advancing direction is pressed and bonded.

Abstract: A fabrication method for a tire comprising a circumferential reinforcement, the said method comprising a stage during which a thread is wound around a form, the tension of the thread being managed during winding, in which method the thread tension is managed through the length of a compensation loop acted upon by a spring.

Abstract: A pneumatic tire according to the invention includes a cap rubber 12 as a non-conductive rubber layer and a conductive layer 13 that extends from the tread surface to the bottom surface of the cap rubber 12 through the cap rubber 12. The conductive layer 13 has a main portion 13a extending from the tread surface toward the inner periphery of the tire, and plural branch portions 13b branched from the main portion 13a and extending toward the outer periphery of the tire. At least, one of the branch portions 13b is exposed to the tread surface.

Abstract: A tire comprising at least one reinforcement structure of carcass type anchored on either side of the tire in a bead, the base of which is intended to be mounted on a rim seat, each bead being extended radially outward by a sidewall, the sidewalls extending radially towards outward to join a tread, the reinforcement structure extending circumferentially from the bead towards said sidewall, an anchoring zone for the reinforcement structure, said tire furthermore comprising an anti-vibration means arranged circumferentially in the junction zone of the shoulder and the sidewall.

Abstract: Tyre belt comprising a rubber composition based on at least one isoprene elastomer, a reinforcing filler, a crosslinking system and an antioxidant agent, characterized in that said antioxidant agent comprises a 4,4?-bis(alkylamino)triphenylamine corresponding to the formula (I): in which R1 and R2, which are identical or different, each represent a linear or branched alkyl group having from 1 to 12 carbon atoms or a cycloalkyl group having from 5 to 8 carbon atoms. Such an antioxidant gives the belt of the invention a better long-term resistance to fatigue and to crack propagation.

Abstract: A process and an apparatus for building a pneumatic tyre for vehicle wheels, in which the tyre includes a carcass structure including at least one carcass ply, at least one annular reinforcing structure associated with the carcass structure, a tread band at a position radially external to the carcass structure, and a pair of sidewalls at axially opposite positions on the carcass structure. The apparatus has a toroidal support and at least one turning-up device provided with an annularly continuous presser element axially translatable along the axis of the toroidal support and radially expandable and contractible relative to the axis of the toroidal support to contact the axially internal surfaces of the strip-like elements and turn them up around at least one reinforcing element.

Abstract: A cord for reinforcing tires, comprising a core of at least one p-aramid filament that has a modulus greater than about 6.5 N/dTex and a sheath of steel strands that are helically wound around the p-aramid filament.

Abstract: The invention can reduce a step between rubber strips even in the case that the rubber strip is made thick, and inhibits a reduction of uniformity and tire quality, a deterioration of a tire outer appearance, and the like. A rubber strip (10) may be scalene triangular shape, a trapezoidal shape or a parallelogram shape having has a bottom line (11) forming a strip width (W), a first diagonal line (12) extending from one end of the bottom line (11) and a second diagonal line (13) extending from the other end (P2) of the bottom line (11), a length (L0) of the bottom line is set to 5 to 50 mm, and a thickness (T) thereof is set to 0.2 to 5.0 mm.

Abstract: A large-width ply base material 30a and a small-width ply base material 30b, which have different width dimensions, are standard-length cut, a plurality of strip plies 26 being at least one of large-width strip plies 26a and small-width strip plies 26b thus obtained are used, non-cut surface sides of the respective strip plies 26 are joined together to build a band-shaped ply member 28, and the ply member 28 is wound round a building drum 50 in a tensioned state, in which the tensile rate is equal to or less than 3%.

Abstract: Disclosed are a method for manufacturing a heavy-duty pneumatic tire by winding a reinforcing belt disposed in a belt layer of a tread with an untopped spiral steel cord, and a tire manufactured by the same.

Abstract: A tire, in which excessively overlapping portions can be made small and excessively overlapping portions on a winding beginning side and on a winding terminating side are not present in the same cross sectional position in a width direction and which is good in tire weight balance and can improve RFV.

Abstract: This invention provides a pneumatic tire having a highly improved steering stability, wherein a reinforcing layer formed by spirally winding a strip-shaped triaxial fabric or triaxial fabric-rubber composite having a width W satisfying a relation of the following formula (I): W?2/3×31/2×(2b/a+d)??(I) [wherein d=4×(D/(??))1/2×10?2, D is a thickness (total dtex) of cord constituting the triaxial fabric, ? is a density (g/cm3) of the cord constituting the triaxial fabric, and a is weaving density (cords/b mm) in one axis constituting the three axes] in a circumferential direction of the tire is disposed in one or more of a bead portion 1, a sidewall portion 2 and a belt portion 5.

Abstract: A process for producing a tread for a tire with a radially inner layer composed of a first rubber material and with a radially outer second layer composed of a second rubber material and forming the ground-contact surface of the pneumatic tire. The first rubber material has higher electrical conductivity than the second rubber material, and where, in a form of a web axially dividing the second layer around the periphery of the tire, the first rubber material extends radially outwards through the second layer as far as the ground-contact surface. A ply of the first and second layers are constructed radially one on the other, on a rotationally symmetric construction surface, on one of the two axial sides of the web to be produced.

Abstract: Reinforcing rubber which constitutes a reinforcing rubber layer in a pneumatic tire 10 is formed by winding a plurality of beltlike reinforcing rubber sheets adapted to have almost the same cross-sectional area and cross-sectional shape around a forming drum over its entire periphery while being shifted in the axial direction of the forming drum such that at least portions thereof in the width direction of the tire overlap each other over the whole periphery of the forming drum and by separately jointing both longitudinal ends of the respective reinforcing rubber sheets. As a result, a pneumatic tire with improved run-flat durability without hindering comfortable riding can be formed while hindrances to manufacture are minimized.

Abstract: A ply application station for applying a tire carcass cord ply to an annular surface includes a plurality of applicator heads disposed at respective spaced apart circumferential locations about the annular surface, each applicator head proximally positioned to a respective assigned region of the annular surface. The system coordinates the application of at least one ply cord by each head to the annular surface region assigned respectively to each head. The plurality of applicator heads operate independently within their respective assigned regions while the core annular surface is rotatably indexed in order to achieve a desired cord ply pattern.

Abstract: A synchronous drive system and method for tire cord application to an annular core surface includes an arm that moves laterally about a first axis in a forward and a reverse direction across the annular surface. A cord application head is coupled to the arm and positions one or more cords on an on the annular surface in the forward and reverse directions. First and second ring motors are coupled to synchronously move the arm and rotate the core. The cord application head may further reciprocate about a second axis of rotation.

Abstract: A tooling head for bidirectional tire cord application to an annular surface reciprocates in a forward and a reverse direction across the annular surface. The tooling head includes a housing; a nose block assembly coupled to the housing and reciprocating in an axial direction relative to the tooling head housing; a pair of cord engaging rollers mounted to a remote end of the nose block assembly and moving therewith in a forward and a reverse direction across the annular surface, the rollers positioning at least one cord against the annular surface in the forward and reverse directions; and a biasing element engaging against the nose block assembly for alternatively biasing the rollers against the annular surface.

Abstract: A method of manufacturing a pneumatic tire according to the present invention can improve productivity. A steel cord S is continuously shaped in a helical manner or in a manner of a two-dimensional wave with at least one of amplitude and pitch of shaping of the steel cord varying in a phased manner or in a continuous manner just before winding of the steel cord S around a belt-forming drum 4. Then, the shaped steel cord S? is continuously wound around the rotating belt-forming drum 4 spirally in the circumferential direction of the drum in such a manner that the circumferential stiffness of a belt-reinforcing layer 16 varies in the widthwise direction of the tire.

Abstract: An unvulcanized rubber strip (3) is supplied to an outer peripheral surface of a rotating cylindrical body (4) from a sending-out roller (16) which laterally moves in an axial direction of the cylindrical body (4), thereby spirally winding the rubber strip (3) to form a winding body (5). In a tilting reference plane (29) defined as a plane which is in parallel to a plane (4S) passing through an axis (4i) of the cylindrical body (4) and which passes through an axis (16i) of the sending-out roller (16), the sending-out roller (16) is held such that the sending-out roller (16) can tilt positively and negatively within an inclination angle (?) of 0 to 45° with respect to a tilting reference line (N) which is parallel to the axis (4i) of the cylindrical body (4). The sending-out roller (16) is laterally moved while changing the inclination angle (?).

Abstract: The invention can reduce a step between rubber strips even in the case that the rubber strip is made thick, and inhibits a reduction of uniformity and tire quality, a deterioration of a tire outer appearance, and the like. A rubber strip (10) may be scalene triangular shape, a trapezoidal shape or a parallelogram shape having has a bottom line (11) forming a strip width (W), a first diagonal line (12) extending from one end of the bottom line (11) and a second diagonal line (13) extending from the other end (P2) of the bottom line (11), a length (L0) of the bottom line is set to 5 to 50 mm, and a thickness (T) thereof is set to 0.2 to 5.0 mm.

Abstract: The invention relates to a machine for manufacturing an object closed onto itself, which machine comprises first means for guiding and carrying a tyre material to be arranged round the first means, characterized in that the first means can change form in controlled manner between a first form and a second form. The invention also relates to a machine for manufacturing an object closed onto itself, which machine comprises first means for guiding and supporting a tyre material to be arranged round the first means, characterized in that the machine also comprises sixth means for folding the tyre material arranged round the first means, for which purpose the sixth means comprise a number of folding members movable relative to each other, which folding members can engage on the tyre material for folding and can therein move inside recesses provided for this purpose in the first means.

Abstract: An object is to provide a tire reinforcing layer forming device which can form, by a single device, plural reinforcing layers whose cord directions intersect one another. A reinforcing material piece 12A, which is distributed to an upper conveying path 72U, is affixed from a left end side of a drum 16 toward a right side, while the drum 16 is rotated in a direction of arrow CW. In this way, the reinforcing material piece 12A, which is affixed to an outer peripheral surface of the drum 16, falls to the right, i.e., rises to the left. Thereafter, similarly, the reinforcing material pieces 12A are successively affixed without gaps, and a first reinforcing layer is formed. Next, the reinforcing material piece 12A, which is distributed to a lower conveying path 72D, is affixed from the left end side of the drum 16 toward the right side, while the drum 16 is rotated in an opposite direction.

Abstract: An automatic plant for producing tyres includes a plurality of work stations and a plurality of devices for transferring the tyres from one work station to another work station and for moving the tyres within a same work station. Each work station is designed to assemble one or more corresponding structural components of the tyres. At least one of the structural components is supplied from a machine for producing the at least one structural component, through a dynamic storage unit, and to at least one of the work stations. A method for producing tyres includes making at least one structural component of the tyres, supplying the at least one structural component to a toroidal support, assembling the at least one structural component on the toroidal support, transferring the tyres from one work station to another, moving the tyres within a same work station, and vulcanizing the tyres.

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.