Abstract: A groove bottom of a circumferential groove formed in a tread surface is provided with a protruding stripe extending along an extending direction of the circumferential groove. The protruding stripe is provided with a top head portion protruding toward a tire outer circumferential side, and a base portion which is narrower than the top head portion and connects the top head portion and the groove bottom. If a small stone is pinched, the top head portion is inclined around the base portion, and the protruding stripe is deflected as a whole, thereby generating a reaction force on the basis of a deformation restoring force.

Abstract: A mold device is described for use in a mold having a plurality of tread molding segments. Each tread molding segment has an end face for mating with an adjoining segment. The mold device includes a piston located on the segment and is actuated by the opening and closing of the mold. The piston is positioned within a first chamber and has a plunger end in communication with a working material and a spring. Each of the mold segments further includes a retractable blade assembly having a distal end in fluid communication with a second chamber. The first chamber is in fluid communication with the second chamber. Closing of the mold compresses the piston, forcing the working fluid to transfer from the first chamber to the second chamber, actuating the blade assembly.

Abstract: A tire mold is described that includes a plurality of tread molding segments having an inner surface for molding the tire tread. The mold further includes a plurality of sidewall plates having an inner surface for molding the tire sidewall. The tread mold segments together with the sidewalls cooperate to form a tire molding cavity. The sidewall plate further comprises a slot that extends from the outer surface of the tread segment to the inner mold surface, and has a pin extending from the outer surface of the tread segment. The pin is mounted to a rotatable body which can swivel. The rotatable body further comprises a guide pin which cooperates with a working member to rotate the body into a desired position in order to position the pin in the tire tread to be molded. The working member actuates the rotatable body into various positions.

Abstract: An apparatus for cooling a cured tire comprising: A retractable support member having a distal end connected to a support plate; the support plate having an inflatable bladder mounted about its circumferential edge; and wherein the retractable support member is rotatable about its axis.

Abstract: A mold blocking member is described for use in a vent bore of a mold for the manufacture of rubber products. The mold blocking member has a tubular hollow body having a first end and a second end. The second end is preferably chamfered for easy insertion into the mold. The first end has a spring element positioned thereon. A cap is affixed to a flat portion of the spring element. The bottom surface of the cap may optionally include channels.

Abstract: A method may include the steps of: (a) providing a tire mold; (b) providing an extruder operatively connected to a head with a die assembly; (c) inserting at least a first compound into the first extruder; (d) forming an extrudate from the die assembly; (e) applying the extrudate directly from the die assembly into the tire mold to form a tire tread component; and, (f) controlling movement of the tire mold to correspond to the extrudate delivery.

Abstract: A method to cure a non-uniform rubber article uses one or more high thermal diffusivity pins in a mold to direct heat to the cure-limiting parts of the article to reduce the total cure time in the mold and increase the uniformity of the cure of the article. Reductions in cure time of up to 20% or more are achieved without substantially changing the function or degrading the performance of the article. The method is particularly useful for curing tires and treads for tires. Finite element analysis or thermocouple probes can used to determine the cure-limiting part(s) for the tire or tread. Using this knowledge, one or more of the high thermal diffusivity pins are located in the mold at positions to transfer heat into the cure-limiting part(s).

Abstract: A bladder is made to be expandable and contractible at a vulcanization position within a lower mold assembly and to be expandable and contractible also at a tire delivery position which is spaced a predetermined distance from the vulcanization position along a center axis of the lower mold assembly. With a centering shaft passing through an upper mold, the bladder and the lower mold assembly, a green tire loaded into the tire delivery position is held by the bladder by expanding the bladder and is loaded by the bladder into the lower mold assembly. After a vulcanization processing, the bladder removes the vulcanized tire from the vulcanization position to the delivery position, and after the centering shaft is drawn out from the lower mold assembly and the bladder, the bladder is contracted at the delivery position to make it possible to release the vulcanized tire from the bladder.

Abstract: The invention provides a tire forming mold and a tire forming method such that letters and lines of a formed tire can be clearly displayed in the case of forming the tire in which the letters and the lines having different colors are formed in a side wall portion.

Abstract: Provided are a apparatus and a method for vulcanizing a pneumatic tire, where are capable of: smoothly releasing a vulcanized pneumatic tire from multiple sectors separated from one another in a circumferential direction in each of an upper mold and a lower mold; and thereby lightening load on each mold. In addition to springs for biasing the sectors to always move into a smaller diameter, respectively, pushpins for moving the sectors into larger and smaller diameters are actuated by the respective cylinder rods of drive cylinders, and thereby the movements of the individual sectors into the larger and smaller diameters are controlled. Accordingly, even though the sectors would otherwise move abruptly into the smaller diameter due to biasing forces of the springs after the vulcanized tire is released from the sectors at the larger diameter, a radius-reducing movement speed of the sectors is control led by the cylinder rods in contact with rear ends of the push pins.

Abstract: A tire building core manipulating apparatus for a segmented tire building core is provided, the core including a plurality of core segments extending generally radially from a central axis. The manipulating apparatus includes a support frame; a core latching mechanism mounted to the support frame for operatively engaging a mating mechanism on the core whereby suspending the tire building core in a preferred axial orientation and raises and lowers the core to engage one or more stations in a tire curing line. A transport mechanism relocates the support frame with the tire building core in the preferred axial orientation between a plurality of stations in the tire curing line.

Abstract: An apparatus selectively forms indicia of a tire sidewall. The apparatus includes a tire mold member for vulcaninzing an uncured tire. The tire mold member includes a surface engageable with a portion of the uncured tire, a detachable indicia forming member engageable with a portion of the uncured tire to form indicia on a surface of the tire sidewall, and a housing for releasably retaining the indicia forming member on the tire mold member. The housing is fixed to the tire mold member and releasably secures the indicia to the tire mold member. The indicia forming member is secured to the housing by an impact device applied in a first direction and released from the housing by mechanical pressure to one end portion of the indicia forming member applied in the first direction.

Abstract: A tire forming mold in which a depression for forming a land portion of a tread surface is provided in a molding surface forming a tread pattern of a tire. The tire forming mold has a pocket provided in the depression, a block fitted into the pocket to form an exhaust chamber in an inner portion of the pocket and holding a laminated blade, which is formed by superposing thin plates, so that one end portion is exposed to the molding surface and the other end portion is exposed to the exhaust chamber, and an exhaust hole having one end portion is communicated with the exhaust chamber and the other end portion is communicated with a mold back face or a mold split face.

Abstract: A method of producing a bicycle rim including, positioning a first quantity of woven fiber strips having a first width and a first length and a second quantity of strips of said woven fibers having a shape different from the first shape to form a first laminated band from the first quantity and the second quantity of strips. A second narrower laminated band is produced. The first band is re-shaped to a V-shaped band before the first band is inserted along the periphery of a mold interior. A core is positioned on the first band and the second band is positioned on the first band. Rim well rings are positioned from outside on the second band, to abut the sides of the second band. A spreader ring is inserted between the rings to join the material near the upper rim flanks and the rim flanges.

Abstract: The invention relates to a vent plug for a tire vulcanization mold used for a vent hole of the mold, the tire vulcanization mold, and a manufacturing method for the tire using the mold. The vent plug includes a plug holder with a hollow ventilation portion and a plug head within the ventilation portion. The plug holder includes a tapered seat portion, an inside diameter of which becomes smaller toward a mold rear side, and a cylinder portion located at the mold rear side of the seat portion. The plug head includes a tapered head portion, an outer diameter of which becomes smaller toward the mold rear side, a base body portion located at the mold rear side of the head portion, and a slit portion communicating with the ventilation portion from an upper end face of the plug head.

Abstract: A tire vulcanizing mold has two or more mold segments with forming surfaces jointly defining the tread rubber profile of a tire to be vulcanized and with a surface area with elevations, such as webs, wherein the surface area forms the circumferential tread rubber profile area of the tire and wherein the elevations impress the depressions, such as grooves, in the tread of the tire. A tire vulcanized with the vulcanizing mold may be a motorcycle tire or an ultra-high performance tire. Certain regions of the forming surfaces of the mold segments that form the tread rubber profile are provided with a roughness, such that those regions of the vulcanizing mold which form the circumferential tread rubber profile area are provided with the roughness. The elevations, on the other hand, which impress the depressions are not provided with this roughness but they are instead smooth.

Abstract: A mold blocking member for use in a vent bore of a mold for the manufacture of rubber products is provided. The mold blocking member has a tubular hollow body having a first end and a second end, wherein the first end has a cap with an inner portion surrounded by a recessed annular portion, wherein the inner portion is connected to the recessed annular portion by a sidewall, wherein the sidewall has one or more slots therein. The slots opening has a width dimension in the range of about 0.1 mm to about 0.6 mm and a thickness in the range of about 0.03 mm to about 0.15 mm. It is preferred that the inner portion is flat and recessed with respect to the outer rim of the first end.

Abstract: Provided are the following: which enhances ventilation efficiency during vulcanization of the tire and also enhances the durability of the metal mold; a plug to be used in a vent hole of the metal mold for tire formation; and a tire manufactured by using the metal mold for tire formation. The metal mold for tire formation of the present invention is one in which vent holes (2) pass through toward an outer portion (1b) of the metal mold from an inner surface (1a) of a metal mold (1), and in which a plug body (3) is detachably fitted into each of the vent holes (2). The plug body (3) is configured by a cylinder (4) and a valve (5). The cylinder (4) includes a large-diameter head portion 4a at an upper portion the cylinder (4), a tubular cylindrical portion 4c with a ventilation hole (4b) formed in the center of the cylinder (4). The valve (5) is inserted into the ventilation hole 4b of the cylinder (4) with an interstice (7) having a predetermined size t interposed therebetween.

Abstract: A reinforced blade for use in a tire vulcanization mold is provided. The reinforced blade, having a thickness of less than 0.030 inches, is configured to form a sipe in a tread of a tire in the tire vulcanization mold. The reinforced blade includes a main segment and a support segment extending from one end portion of the main segment of the reinforced blade and configured to support the end portion of the main segment of the reinforced blade in the mold during vulcanization.

Abstract: A mold (150) for a tread layer (40) having tread-forming side and sole-forming side, the sole-forming side having a plurality of mold elements (56) extending therefrom toward the tread-forming side. Either the mold elements (56) or the sole-forming side of the mold is configured to create a tread layer (40) having a tread element such as an incision, lateral groove, longitudinal groove or other void on the sole side of the tread layer that enables the edges of the tread element to obtain full coverage when subjected to an abrasion process.

Abstract: A tire mold is described that includes a plurality of tread molding segments having an inner surface for molding the tire tread. The mold further includes a plurality of sidewall plates having an inner surface for molding the tire sidewall. The tread mold segments together with the sidewalls cooperate to form a tire molding cavity. The sidewall plate further comprises a slot that extends from the outer surface of the tread segment to the inner mold surface, and has a piston having a head slidably received in the slot. A pin is positioned between the piston head and an end of the slot. The mold further includes actuating means for actuating the piston in the slot when the mold is closed.

Abstract: A process for vulcanization and moulding of a pneumatic tyres in tyre manufacture is carried out with an apparatus including a vulcanisation mould and including: a pair of plates adapted to be moved close to each other; a plurality of circumferentially distributed mould sectors; the plates and sectors being mutually movable between an open condition at which they are spaced apart to enable loading of the tyre being worked, and a closed condition at which they define a moulding cavity having a geometric configuration matching the outer surface of the tyre to be obtained. The process includes the steps of: loading the green tyre into the mould; vulcanising the tyre: opening the mould; and exerting a radially outward thrust action on each mould sector.

Abstract: A die rib for a tire mold defines the inlets to vent passages of the mold through the sides of the die ribs so that the vent passages do not open through the contour surface of the mold. In one exemplary configuration, the invention provides a die rib having a vent inlet disposed along at least one side of the die rib. The vent inlet may be disposed along up to 80 percent of the length of the die rib with at least one foot disposed against the contour surface of the tire mold section.

Abstract: A splice bar for a tire tread die designed for providing a narrow strip of electrically conductive rubber extending from a lower under tread to the surface of the outer tread by positioning a slotted chimney block in a the outer tread rubber passage and having a passage between the chimney slot and the under tread rubber passage specially shaped for improving the flow of rubber during extrusion. This passage is essentially straight for guiding a strip-shaped stream of rubber of the under tread to the chimney slot. The passage intersects the rear surface of the splice bar to form a generally rectangular shaped corridor extending from the rear surface to the chimney slot.

Abstract: A tire has at least one tread wear indicator. Each wear indicator is a single mark that provides continuous information to the consumer, while changing its presentation based upon the amount of tread wear. The mold blade employed to form the ear indicator has a series of stacked portions, each portion having a different configuration, the configuration being constant for the length of each portion.

Abstract: The present invention provides for an improved device for molding keyhole sipes larger in size, i.e. sipes having a wider passage, than currently being formed in treads that will avoid damaging the tread during formation and removal thereof from a mold. The device includes an elongated deformable body member having a blade extending in a direction away therefrom and substantially along the length thereof. The body member also includes a stiffening member securely fixed in position therein that extends substantially the length thereof. The stiffening member provides a desired rigidity to the deformable body member, thereby limiting flexion along its length under the stress of a rubber formulation when the mold is closed during the molding process. Also, the deformable body member provides low stress on the tread when a slit of the keyhole sipe is pulled around the body member during removal of the tread from a mold.

Abstract: Vent valve for venting bores of vulcanization moulds, especially for the tread profile area, consisting of a valve sleeve, in which a valve insert and a wound spring are movably located, wherein the valve insert consists of a valve shank, which is at one end equipped with a disk and at the other end with a conical surface changing into backwards oriented conical end, and the movement of the valve insert is controlled by a delimiter of opening the valve. Inner surface of the valve sleeve is in its part located further away from disk provided with conical surface, oriented away from the disk, and the delimiter of opening the valve is formed by two mutually cooperating conical surfaces or parts of conical surfaces, wherein the conical surface formed at the end of the valve shank of the valve insert is oriented against the conical surface or part of conical surface of the valve sleeve.

Abstract: A pneumatic tire includes a tread that has: land portions formed and segmented by a plurality of circumferential grooves extending in a tire circumferential direction and by a plurality of widthwise grooves extending in a tire width direction; and sipes formed in contact patches of the land portions. The pneumatic tire includes: recessed sections (groove-bottom recessed sections) that are formed in tire-width-direction lateral surfaces of the land portions provided in tire-width-direction outermost parts, so as to connect to the widthwise grooves; and indents/lugs that are formed in bottom surfaces of the recessed sections such that indents/lugs thereof are arranged alternately and continuously in a linear manner.

Abstract: A device (20) comprising a pressure measurement surface (28) functionally attached to a proof body (22) and a rigid component (30), functionally attached to the proof body (22), the measurement surface (28) forming a surface of the rigid component (30). In addition, the device comprises a support (38), functionally separated from the proof body (22), of generally annular shape, housing the rigid component (30) and a flexible mass (40) radially inserted between the support (38) and the rigid component (30) such that the contour of the measurement surface (28) is bounded by the flexible mass (40), this flexible mass (40) adhering to the support (38) and to the rigid component (30).

Abstract: An insert for a tire mold is provided. In one embodiment, the insert has an elongated cylindrical body. The insert includes at least one channel portion with a plurality of channels disposed in a non-axial direction along the surface of the insert. The at least one channel portion extends from a first end of the insert. The insert may further include a reduced diameter portion with at least one axial groove disposed thereon.

Abstract: The invention relates to a vent plug for a tire vulcanization mold used for a vent hole of the mold, the tire vulcanization mold, and a manufacturing method for the tire using the mold. The vent plug includes a plug holder with a hollow ventilation portion and a plug head within the ventilation portion. The plug holder includes a tapered seat portion, an inside diameter of which becomes smaller toward a mold rear side, and a cylinder portion located at the mold rear side of the seat portion. The plug head includes a tapered head portion, an outer diameter of which becomes smaller toward the mold rear side, a base body portion located at the mold rear side of the head portion, and a slit portion communicating with the ventilation portion from an upper end face of the plug head.

Abstract: A tire includes a tread in which there is provided a molded channel. The molded channel is interrupted by at least one furrow of the tread and extends along a curved path. The path of the molded channel is preferably substantially parallel to an outside surface of the tread in a radial section plane of the tire.

Abstract: The present invention relates to a method of retreading a tire and a retread tire (10) made by this method. The method comprises the steps of providing a tread layer (40) having a tread side (44) and a sole side (46) wherein the surface of the sole side (46) includes a plurality of tread elements (48) such as sipes and/or grooves or other void. Each tread element (48) has a first edge (64) and a second edge (66) at the surface of the sole side (46) of the tread layer (40). At least one of the first edge (64) and second edge (66) is formed to have a break edge (84) such as a rounded edge or a chamfered edge of 0.4 mm or more. The break edge (84) removes the sharp corner and provides increased endurance for the retreaded tire (10).

Abstract: A mold and molding device for forming a sunken groove in a tire is provided. The molding device includes a thin flexible wire having a desired cross-sectional shape. The wire thickness can range from about 0.5 mm to about 5 mm. The flexible wire is preferably hyperelastic. An optional molding element may be connected to the flexible wire.

Abstract: A mold and molding device for forming a sunken groove in a tire is provided. The molding device includes a thin flexible wire having one or more molded elastomer elements thereon. The flexible wire is preferably hyperelastic and the molded elastomer is preferably silicone rubber.

Abstract: Provided is a mold for vulcanization of a tire which does not entail troublesome work including removing vent spews, and which does not spoil the external appearance of the tire with the spews, as well as prevents light failures from occurring in the tire. Vent grooves (13, 14) are formed in sidewall molding surfaces (4, 5) for molding sidewall parts in such a way as to extend zigzag in the tire circumferential direction, respectively. At least one vent hole (11 or 12) is formed in each of the vent grooves (13, 14).

Abstract: The invention relates to a device comprising a receiving device (3) for post-treating tyres (1). After vulcanising the elastomer material, the tyres (1) are subjected to internal pressure by means of support gas, and cooled. Said receiving device (3) is embodied such that it can maintain the tyres (1) and also seal the inner chamber of the tyres. Also, a pressurised gas supply is connected to the receiving device (3). Said receiving device (3) comprises at least two fixed receiving areas (4) for at least two tyres (1). The tyres undergo at least one introduction process using a positionable handling device (19).

Abstract: A green tyre is built on a forming drum and then transferred to a bead moulding and pre-vulcanisation station where each bead of the tyre is moulded by tightening it between two axially opposite clamping surfaces respectively carried by an axially external annular locating element and an axially internal annular locating element consisting of radially expandable circumferential sectors. The tightened beads can be pre-vulcanised through heat supply by means of electric resistors integrated into the axially external annular locating elements. The tyre with the tightened and possibly pre-vulcanised beads is transferred to a moulding cavity having an inner wall substantially conforming to the shape of an outer surface of the moulded tyre to carry out moulding and complete vulcanisation of the tyre.

Abstract: A tire mold and a molding device for forming a sunken groove in a tire are provided. The molding device includes one or more rigid elements joined to a flexible member. The flexible member is formed from a flexible material, preferably a superalloy, or hyperelastic material. The molding device may further comprise a magnet. A portion of the flexible member is positioned in contact with a first surface of a relief forming element of a mold and the rigid element has a mating surface in mating contact with a second surface of the relief forming element. The mold further may further comprise a second relief forming element positioned adjacent the first relief forming element, wherein the rigid element further includes an outer surface in mating contact with a surface of said second relief forming element.

Abstract: A tire mold and a molding device for forming a sunken groove in a tire are provided. The molding device includes one or more rigid elements joined to a flexible member along an attachment point or line on the connecting surface of the rigid element. The flexible member is formed from a flexible material, preferably a superalloy, or hyperelastic material. If multiple rigid elements are utilized, the rigid elements are closely spaced together such that a portion of the opposed walls are in mating contact with an adjacent rigid element.

Abstract: A tread provided with a plurality of cutouts of essentially transverse orientation and characterized in that when new, some of the transverse cutouts form on the running surface hollowed zones of average width Lt greater than or equal to 2 mm and of maximum depth Pt at most equal to 80% of the thickness Pb of tread to become worn, the other transverse cutouts forming on the same running surface incisions of average width Li less than 2 mm and of depth Pi at most equal to Pt. A plurality of the incisions extending by hollowed zones such that after homogenous wear of the tread the volume V1 of the hollowed zones opening on to the new running surface is between 50% and 150% of the volume V0 formed by the hollowed zones when new.

Abstract: An insert for a tire mold is provided. In one embodiment, the insert has an elongated cylindrical body. The insert includes at least one channel portion with a plurality of channels disposed in a non-axial direction along the surface of the insert. The at least one channel portion extends from a first end of the insert. The insert may further include a reduced diameter portion with at least one axial groove disposed thereon.

Abstract: A vacuum forming apparatus for forming a tire, wheel, or other item in a mold having a cavity with the shape of the item to be cast that is contained in the apparatus. The vacuum forming apparatus utilizes a bell shaped outer cover arranged to seal along its lower edge to a mold base plate, and includes a canister maintained under a deep vacuum and arranged in or connected to the apparatus as a reservoir to receive a mixture of urethane constituents, with the deep vacuum removing air from that mixture, and the air free mixture is passed through a valve and into the mold cavity. A low level vacuum is pulled through a vent valve in the bell shaped outer cover to pull the flow of urethane material through the cavity, filling the mold. With the cavity filled, the canister valve is shut and the vent valve in the bell shaped outer cover is closed, allowing the urethane material in the mold cavity to cure, and the mold is broken open and the cast item is removed from the cavity.

Abstract: A method and apparatus for venting a mold for vulcanizing a tire is provided. The mold comprises a plurality of tread segments for forming the tread on a green tire, wherein each of said tread segments further comprises an outer cavity plate having an interior surface and an exterior surface, the cavity plate having a plurality of channels. Each of the channels has a vent hole extending from the channel to the exterior surface of the outer cavity plate, and a rib mounted over the channel. The adjoining surface of the rib mating with the interior surface of the cavity plate, wherein one of the mating surfaces has a roughened surface forming a vent passageway with the interior surface of the cavity plate for venting mold gasses from the interior of the mold to the exterior of the mold. The invention may further include a blade and blade passageway wherein the blade outer surface has a rough outer surface for forming a vent passageway with the blade passageway.

Abstract: A pneumatic tire comprises a tread portion provided with sipes, the sipes each having a zigzag configuration at any depth from the top of the sipe to a certain depth, and the zigzag configuration having vertexes Q1 on one side of the zigzag and vertexes Q2 on the other side of the zigzag, wherein as the depth increases from the top of the sipe to said certain depth, the vertexes Q1 shift in the longitudinal direction of the sipe and the direction of the shift is turned at least once such that the vertexes Q1 first shift towards one direction then towards the other direction, thereby describing a zigzag line extending from the top of the sipe to said certain depth and having at least one tuning point, but the vertexes Q2 describe lines which are linear or less zigzag when compared with the zigzag lines described by the vertexes Q1.

Abstract: A tire blade system for curing tires including a tire mold defining at least one slot, the slot defining a first recess and a second recess spaced by a bridge, the walls of the first and second recess being straight; a blade including a body exposed within the tire mold and an attachment assembly received in the slot, the attachment assembly including a first and a second prong spaced by a notch; and wherein the first prong includes a engaging edge and the second prong including an undercut edge, and when the blade is inserted into the slot, the engaging edge deflects the bridge toward the undercut edge to resiliently hold the blade in the slot.

Abstract: A tire mold and a molding device for forming a sunken groove, sipe in a tire is provided. The molding device molding device comprises a flexible member and a blade element, the flexible member having a distal end for mounting to a tire mold, a radiused midsection and a second end, wherein a portion of the second end is embedded within the blade element, the blade element having a lower surface with a cutout to allow bending of the flexible member.

Abstract: The tire has a plurality of radially outer rubber components defining a radially outer surface (S1) exposed to fluids having a relative displacement with respect to the rotating tire. At least one radially outer component has projections, the projections being defined by first sides (2) and second sides (2?) of unequal length. The first sides (2) have a greater length, delimiting therebetween an angle ? ranging from 5° to 60° and forming at their intersection an apex (P). The projections protrude by a height (h) from the radially outer surface (S1) from which said first and second sides originate, the height (h) ranging from 0.2 to 100 micrometers. In more than 75% of the projections, any plane tangent to the first side (2) of the projection cuts the radially outer surface (S1) at an acute angle.

Abstract: A method may include the steps of: (a) providing a tire mold; (b) providing an extruder operatively connected to a head with a die assembly; (c) inserting at least a first compound into the first extruder; (d) forming an extrudate from the die assembly; (e) applying the extrudate directly from the die assembly into the tire mold to form a tire tread component; and, (f) controlling movement of the tire mold to correspond to the extrudate delivery.

Abstract: A pneumatic tire is cured and molded by a sectional type tire mold including an annular side mold section having a tread forming surface for forming a tread surface, the side mold section comprising a plurality of sectors into which the side mold section is divided along a circumferential direction of the side mold section. A tread surface, which has first regions formed by sector divisional position vicinity regions of the side mold section and second regions formed by sector divisional position distant regions of the side mold section, has lands defined by at least one circumferential groove which extends in a circumferential direction of the tire. Sipes which extend from the at least one circumferential groove into at least one of the lands with their extension ends located within the at least one land are disposed at predetermined intervals along the tire circumferential direction. The sipes comprise first sipes in the first regions and second sipes in the second regions.