Pneumatic tire and method of manufacturing same

A method of manufacturing a pneumatic tire comprising a tread reinforcing-cord layer electrically-conductive to a rim in a state of the tire mounted on the rim, a tread rubber of which the radially inner periphery forms a contact area contacting the above-mentioned tread reinforcing-cord layer and of which the radially outer periphery forms a tread ground contact area contacting a road surface;

• characterized in that the method comprises
• a tread rubber forming process and
• a vulcanizing process to vulcanize a green tire provided with the above-mentioned tread rubber in the tread section;
• wherein
• the above-mentioned process of forming the tread rubber comprises a base rubber section forming step to form the base rubber section outward the above-mentioned tread reinforcing-cord layer in the radial direction of the tire by helically winding an unvulcanized first electrically non-conductive rubber strip containing silica from the one tread edge side to the other tread edge side, and a cap rubber section forming step to form the cap rubber section outward the above-mentioned base rubber portion in the radial direction by helically winding an unvulcanized second electrically non-conductive rubber strip containing silica from the other tread edge side to the one tread edge side;
• the above-mentioned step of forming the base rubber section comprises a step of forming a first electrically conductive winding section to form the first electrically conductive winding section comprising the unvulcanized first electrically conductive rubber strip wound helically more than once with the unvulcanized first electrically non-conductive rubber strip between winding sections of the above-mentioned unvulcanized first electrically non-conductive rubber strips adjacently in the axial direction of the tire by interrupting the unvulcanized first electrically conductive rubber strip being the substantially same in width as the above-mentioned unvulcanized first electrically non-conductive rubber strip into the above-mentioned unvulcanized first electrically non-conductive rubber strip;
• and
• the above-mentioned cap rubber section forming step comprises a step of forming a second electrically conductive winding section to form the second electrically conductive winding section comprising the unvulcanized second electrically conductive rubber strip wound helically with the unvulcanized second electrically non-conductive rubber strip between winding sections of the above-mentioned unvulcanized second electrically non-conductive rubber strips adjacently in the axial direction of the tire by interrupting into the above-mentioned unvulcanized second electrically non-conductive rubber strip the unvulcanized second electrically conductive rubber strip being the substantially same in width as the above-mentioned unvulcanized second electrically non-conductive rubber strip;
• wherein an exposed surface section comprising a radial upper end of the above-mentioned first electrically conductive winding section exposed at the radially outer periphery of the above-mentioned base rubber section and an exposed surface section comprising a radial lower end of the above-mentioned second electrically conductive winding section exposed at the radially inner periphery of the above-mentioned cap rubber section are tilted in different directions relative to the circumferential direction of the tire, and these exposed surface sections intersect each other, and as a result, the above-mentioned first and second electrically conductive winding sections are conducted each other at the above-mentioned position of the intersection;
• and
• wherein, in the above-mentioned second electrically conductive winding section, the above-mentioned second electrically conductive rubber strip is helically wound less than once.