Assertion: radial tire's structure | /r/HasProperty | at least three layers
Facets:
Source sentences:
text: In order to attain the above-mentioned objects, a fundamental structure of the pneumatic radial tire of the present invention comprises a reinforcing belt layer having a structure composed of at least three layers made of a metallic cord and disposed between a carcass and a tread, and a narrow groove extending in the circumferential direction of the tire which is provided in each of left and right shoulder portions of the surface of the tread, wherein among the layers constituting the reinforcing belt layer, a second reinforcing belt layer and a third reinforcing belt layer starting with the carcass towards the tread cross each other at a cord angle of 10° to 30° relative to the circumferential direction of the tire; and a first reinforcing belt layer starting with the carcass towards the tread has a cord angle of 40° to 75° relative to the circumferential direction of the tire and is split into left and right portions in the central region of a crown and provided with an organic fiber cord layer having a cord angle of 0° to 10° relative to the circumferential direction of the tire between the left and right split portions of the first reinforcing belt layer.