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 pneumatic tire 22 includes a pair of beads 30 and a carcass 32 extending on and between both beads 30. Each bead 30 includes a core 48. The core 48 includes: a main body 56 including a cord 60 extending in a circumferential direction; and a stretchable portion 58 formed from a crosslinked rubber. The stretchable portion 58 is located inward of the main body 56 in an axial direction. The stretchable portion 58 has a size with which at least one cross-section of the cord 60 can be included therein in a cross-section of the bead 30. Preferably, in the tire 22, the main body 56 includes a hard unit and a soft unit. The soft unit is located outward of the hard unit in a radial direction. A hard cord of the hard unit stretches more easily than a soft cord of the soft unit.

The present disclosure relates to a cable bead for a pneumatic tire which constitutes a bead part of a pneumatic tire, improves rubber permeability by restricting a ratio between a diameter of a cable and a pitch of an outer wire, and improves durability of a pneumatic tire by improving rubber adhesive properties through cobalt coating on a surface of the outer wire, and a pneumatic tire having the same, and the cable bead for a pneumatic tire is characterized in that the diameter D of the cable and a pitch P of the outer wire 20 satisfy a relationship formula, P/D=25 to 45, and further characterized in that the surface of the outer wire 20 is coated with cobalt after wire drawing.

A bead wire for a tire includes a core, an outer layer, and at least one intermediate layer. The core includes at least one yarn of a multifilament textile fiber embedded in an organic matrix. The outer layer includes an outer-layer metal wire wound around the core. Each intermediate layer includes an intermediate-layer metal wire wound around the core. Each intermediate layer is disposed between the core and the outer layer.

A cable bead comprising an annular core and a side wire spirally wrapped up around the annular core, wherein the annular core is made up of a round steel wire made to circle once or made, without being stranded, to circle 2 to 10 times side by side, and wherein the side wire is a round steel wire consecutive from the annular core. This provides a high-strength cable bead that can press a tire main body against a wheel without fail even if a tire is charged with a high load.