| 摘要 |
PROBLEM TO BE SOLVED: To improve both of turning performance and wear resistance of a center part 27.SOLUTION: Since a reinforcement cord, which constitutes a belt layer 24, is configured from a cord having a low elastic modulus (a tensile force of less than 15 N at the time of elongation by 1%), a circumferential shear force of a tread 26 is lowered, and as a result, a value of wear energy becomes small, and wear resistance of the tread 26 is improved. Further, tanδ of a shoulder part 28 is so made as to be larger than tanδ of a center part 27, and consequently, a grip limit at the shoulder part 28, which grounds during turning, is enhanced, thereby improving turning performance. |
