| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic radial tire and a die therefor capable of improving the high-speed durability performance, the partial wear resistance performance, and the groove crack resistance performance and reducing the manufacturing cost of the die. SOLUTION: In this pneumatic radial tire and the die thereof, the difference between the radius of the tire on the equatorial surface of the tire and the radius of a tread contact end face of the tire is >=4%, the crown shape of the tread is formed so as to constitute >=80% of the tread contact width by connecting three tread radii having a point of inflection, a connection part in the radial direction of the tire of the tread radii to each other is located at the position of 10-30% of the tread contact width from the contact end, a straight groove is disposed in the tire circumferential direction, and a belt reinforcing layer formed of organic fibers of at least two layers is disposed below the straight groove. |
