Pneumatic Tire

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;
• and
• 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.