A chemical vapor deposited, \u03b2 phase polycrystalline silicon carbide having a high thermal conductivity and reduced stacking faults. An indication of an overlap area on a base image displayed within a computer display is received. Each circumferential narrow groove is formed in such a manner that, when the tire is mounted on the vehicle, the circumferential groove is located on the outer side of the tire with reference to the center of the second rib in the tread width direction.