Patent ID: 9126456
Filing Date: 2015-09-08
Classification: B60C

Abstract:
1. A pneumatic tire comprising: a belt layer including a pair of cross belts and a circumferential reinforcing layer disposed between the cross belts or disposed inward in the tire radial direction of the cross belts and that comprises a steel wire wound spirally at a slant within a ±5° range with respect to a tire circumferential direction, and a tread portion disposed outward in the tire radial direction of the belt layer and that contacts a road surface; wherein when assembled on a regular rim, inflated to a maximum air pressure of a regular inner pressure, provided with a camber angle of 0° , and subjected to 100% of a regular load, a form of a ground contact patch of the tread portion is such that 0.9<LZ/LC<1.0, where LC is a ground contact length in the tire circumferential direction on a tire equatorial plane and LZ is a ground contact length in the tire circumferential direction of an edge in a tire width direction of the circumferential reinforcing layer; the circumferential reinforcing layer has a width in the tire width direction that is not less than 60% and not more than 85% of a maximum ground contact width in the tire width direction of the ground contact patch of the tread portion; and a form of the ground contact patch of the tread portion is such that 0.95<L98/L90<1.05, where L90 is a ground contact length in the tire circumferential direction at a location where the ground contact length is 90% of the maximum ground contact width in the tire width direction, from the tire equatorial plane; and L98 is a ground contact length in the tire circumferential direction at a location where the ground contact length is 98% of the maximum ground contact width in the tire width direction, from the tire equatorial plane.