Patent ID: 7150302

Claim:
A tire bead core having an annular body formed by annularly winding and bundling one bead wire in a form of a quadrangle in cross section which has two pairs of opposing sides substantially parallel to each other, the annular body comprising a plurality of winding portions radially stacked, each winding portion comprising sections of the bead wire annularly wound so as to align in a widthwise direction of the bead core which is parallel to the rotation axis of the bead core, wherein a winding portion of the annular body located radially outward is displaced to one side of the widthwise direction with respect to a winding portion of the annular body located radially inward, wherein the winding portion located radially more outward is displaced more to the one side of the widthwise direction, and wherein a displacement amount between the winding portions adjacent to each other is 10% to 50% of a width of the bead wire.