| 摘要 |
PURPOSE:To improve maneuvering stability without degrading comfortability like a conventional technology in which the maneuvering stability is improved by excessively increasing bead part rigidity. CONSTITUTION:An organic fiber cord layer 14 whose Young's modulus in the orthogonal direction to the peripheral direction of a bead core 4 which is formed by bundling plural steel wires 11, is at least 50kg/mm<2>, is wound around the head core 4 so as to cross in the peripheral direction of the bead core 4. |
