| 摘要 |
PROBLEM TO BE SOLVED: To reduce separation made between each of cords and to improve durability of a tire by eliminating a rigidity step difference among each of rubber. SOLUTION: A spiral belt 7 is constituted by combination of a first ply 7A on which the first cord 7A1 having characteristics that initial tensile resistance is more than 50cN/pieces is covered with coating rubber 7A2 and a second ply 7B on which the second cord 7B1 having the same characteristics is covered with coating rubber 7B2. COPYRIGHT: (C)2005,JPO&NCIPI
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