| 摘要 |
A tread rubber 2G comprises a base portion 9 made of electrically non-conductive rubber compounding silica and having a width substantially equal to a width of the tread reinforcing-cord layer 7; a conducting portion 11 made of the electrically conductive rubber, covering a radially outer surface of the base portion 9 and extending i n the axial direction of the tire, and protruding both end portions 11a and 11b outwardly from the base portion 9 so as to connect the both end portions with tire members Ty electrically conducted to a rim J at a state of mounting the tire on the rim; and a cap portion 10 made of electrically non-conductive rubber compounding silica and di sposed outside the conducting portion 11 in the radial direction of the tire and forming a major part of a ground contact surface 2a. The radially outmost surface of the conducting portion 11 in a meridian section of the tire is exposed on the ground contact surface 2a. The cap portion 10 comprises a first cap portion 10A disposed on one side and a second cap portion 10B disposed on another side of the outmost surface 11A of the conducting portion 11 in the axial direction of the tire. |
