A bead core of the present disclosure is a bead core comprising an annular body in which a strip member comprising one or more bead wires coated with a coating resin is wound and stacked, and in an axial cross section of the annular body, the strip member has two side surfaces, and has at least one end portion of at least one of the two side surfaces that is chamfered.

This pneumatic tire includes bead cores formed by winding a bead wire. In a cross-sectional view of the bead core, the bead core has a wire array structure of a hexagon formed by winding the bead wires in a close-packed manner. The hexagon is a projecting hexagon with an obtuse internal angle at every vertex. A layer number M of wire cross sections in a Y-axis direction and a maximum value N_max of an array number N of the wire cross sections in an X-axis direction satisfy 0.75M/N_max1.30. A distance A in a lateral direction from a vertex of the hexagon on the innermost side in the lateral direction to the centroid of the hexagon, and a distance B in the lateral direction from a vertex of the hexagon on the outermost side in the lateral direction to the centroid of the hexagon, satisfy 1.05B/A.

Provided is an annular bead ring formed from a bead wire that has been subjected to wire drawing, the bead wire having a true strain of 2.80 or greater as calculated by =ln(d.sub.0/d.sub.1).sup.2, a tensile strength of 2000 MPa or greater, and a proof stress of 1700 MPa to 1980 MPa, where do is a wire diameter (mm) of the bead wire before wire drawing and di is a wire diameter (mm) of the bead wire after wire drawing.

A tire for a motor vehicle having at least one carcass ply comprised of a crown portion and two axially opposite side portions terminating in beads for mounting the tire on a rim. A tread band and a belt structure are interposed between the carcass structure and the bead. Each bead includes on elongated cord comprised of a first yarn, such as aramid, having a melting or decomposition point T.sub.1, and a second yarn, such as nylon, having a melting point T.sub.2, wherein T.sub.1>T.sub.2, and T.sub.2 is greater than 40 C.

Provided are: a cable bead which can realize a weight reduction while maintaining the breaking pressure resistance; and an airplane tire including the same. A cable bead (10) includes: a core (1) composed of an annularly formed steel; and a sheath (3) composed of at least one sheath layer, which is formed by spirally winding a sheath filament (2) composed of a steel around the core (1). The sheath filament (2) has a carbon content of higher than 0.90% by mass but 0.95% by mass or less, and a chromium content of 0.15 to 0.30% by mass.

A pneumatic tire is provided that can achieve performance that is equivalent to or higher than that of known tires while allowing weight reduction of bead cores by using, for the bead cores, a composite cord. A pneumatic tire includes annular bead cores (5) embedded in bead portions (3), and a carcass layer (4) locked on the bead cores (5). Each of the bead cores (5) includes a cable bead structure in which a composite cord (10) is spirally wound around an annular core body (20), the composite cord including a core wire (11) formed of carbon fibers and a plurality of siding wires (12) formed of glass fibers disposed around the core wire (11).

A metal-resin composite member for a tire, comprising plural metal cords that are positioned alongside each other, an adhesive layer that is disposed on the metal cords, and a resin layer that is disposed on the adhesive layer, the metal-resin composite member satisfying at least one of the following (1) or (2): (1) the adhesive layer is independently disposed on each of the plural metal cords, and at least one of the adhesive layers has a cross-sectional shape that has a projecting portion; (2) the adhesive layer is integrally disposed on all of the plural metal cords, and a region consisting of the metal cords and the adhesive layer has a cross-sectional shape that has, between the metal cords, a portion that is narrower in width than a portion at which the metal cords are disposed.

A pneumatic tire comprises a carcass formed of a carcass ply extending between a pair of bead portions in a toroidal shape, and a bead core disposed in a respective one of the bead portions, the bead core comprising an axially inner core and an axially outer core respectively disposed on an axially inner side and the axially outer side of the carcass ply. The bead portion comprises an inner bead apex rubber extending radially outward from the inner core, and an outer bead apex rubber extending radially outward from the outer core. An outer apex height Ho from a bead base line to a outer end of the outer bead apex rubber is in a range of from 120% to 150% of an inner apex height Hi from the bead base line to the outer end of the inner bead apex rubber.

In a bead core, metal cords are accumulated and formed in plural columns and plural columns, and the row direction length is formed greater than the column direction length; the metal cords are set in two or more columns from the third row of the metal cords on as counted from a tire radial direction outer end inward in the tire radial direction and excepting a tire radial direction innermost end; a length dimension of the bead core is set equal to or greater than twice a maximum width dimension of the bead core; the centroid of the bead core is positioned on the tire radial direction inner end side of the bead core relative to the lengthwise direction center portion of the bead core; a maximum width portion of the bead core is positioned from the second row of the metal cords on as counted from the tire radial direction inner end of the bead core outward in the tire radial direction; and the maximum width portion of the bead core is positioned from the second row of the metal cords on as counted from the tire radial direction outer end of the bead core inward in the tire radial direction.

In a pneumatic tire, a bead core has end portions in a tirewidth direction formed as vertical lines along a tireradial direction. A length of the vertical lines is from 20% to 30% of a core height. In two adjacent bead core layers of first, second and third layers, the radial outer layer tireincludes two or more bead cores more than the radially inner layertire, and a misalignment amount between the bead wires each at an end portion on one side in the tirewidth direction is one-half of a bead wire thickness. A side on which the misalignment amount between the first and second layer bead wires is one-half of the thickness of the bead wire is opposite in the tirewidth direction to a side on which the misalignment amount between the second and third layer bead wires is one-half of the thickness of the bead wire.