| 摘要 |
PURPOSE:To suppress heat generation and improve durability and comfortability in high speed running, by constituting a tire tread of a base tread rubber layer and a cap tread rubber layer, and providing inner and outer belt cover layers outside of a belt layer to specify a tire structure. CONSTITUTION:A base tread rubber layer 3b is formed of rubber having a loss tangent (tan delta) of not more than 0.2, and a cap tread rubber layer 3c is formed of rubber having a loss tangent (tan delta) of not less than 0.4. A plurality of belt layers 5 having a cord angle of 10-30 deg. relative to a circumferential direction of a tire is provided outside of a tread portion of a radial carcass 4. There are further provided an outer belt cover layer 6u covering the belt layer 5 over the entire width outside of the belt layer 5, and an inner belt layer 6d between the belt cover layer 6u and the belt layer 5 at both ends of the belt layer 5. |
