| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pneumatic tire that prevents a decrease in high speed durability by suppressing excessive vulcanization during vulcanizing and heat generation during driving at the bottom of a groove, and improves steering stability at high speed driving. <P>SOLUTION: A grove bottom rubber layer 23 formed of a rubber composition with cyclic polysulphide blended therein is disposed at the bottom of a groove 10 in a circumferential direction. The groove bottom rubber layer 23 extends from the bottom of the groove 10 in the circumferential direction toward an inner side in the radial direction of the tire up to a base rubber layer 22 to divide a tread rubber layer 21 in the width direction of the tire. <P>COPYRIGHT: (C)2013,JPO&INPIT |
