| 摘要 |
<p>Sudden delamination damage between a carcass and a belt layer at the final stage of wear caused by thermal degradation is suppressed. In an all-steel radial structure, reinforcing rubber layer 11 having a 100% modulus which is 2 Mpa or more and is not more than 100% moduli of a topping rubber of carcass 6 and a topping rubber of belt layer 7 and having a thickness T of 0.3 to 3.5 mm is disposed between the carcass 6 and the belt layer 7. The belt layer 7 includes a pair of working belt plies 10 which radially overlap each other and whose belt cords are inclined in one and the other directions with respect to a tire equator. The working belt plies 10 are such that a flexural rigidity G of the belt cord per a single cord falls within the range of 110 to 340 gf·cm, and a belt ply flexural rigidity defined by the product G×N of the flexural rigidity G and the number N of cords per inch of working belt ply 10 falls within the range of 2,000 to 3,500 gf·cm.</p> |
