| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight pneumatic radial tire without reducing durability.SOLUTION: A pneumatic radial tire includes a belt formed of at least two belt layers. Each of the first and second belt layers of the belt is obtained by embedding steel cords 10 each comprising a core formed by arranging in parallel two core filaments 11 without twisting and N(2≤N≤4) sheath filaments 12 twisted around the core in coating rubber along a belt width direction in parallel. When a diameter of the core filament 11 is d1, and a diameter of the sheath filament 12 is d2, d1>d2 is satisfied. When a thickness of the first belt layer is t1, and a thickness of the second belt layer is t2, t1<t2 is satisfied. |
