| 摘要 |
PROBLEM TO BE SOLVED: To enable the rolling resistance to be reduced without deteriorating tire performance such as performance on wet surfaces and wear-resistance. SOLUTION: The tire is provided with a caucus layer 2 between a pair of left and right bead portions 1, 1, and at least dual belt layers 7 on the outer periphery of the caucus layer 2 in a tread portion 4. In this case, a groove or a recess portion 8, where the minimum lower thickness is 80% or less than the mean tread thickness and 1 mm or more, is provided in a range S which is 80-115% of 1/2 W with respect to the maximum belt width W of the belt layer 7 from the crown center. Low tanδrubber 9 of 30-90% of the tanδof the center portion cap tread rubber is provided in at least one part of the cap tread rubber in the range S.
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