Patent ID: 8210218

Claim:
A pneumatic tire having a non-specified rotational direction and comprising lug grooves cutting across at least a land portion at a shoulder side of a tread portion at both sides in a tire width direction, wherein: the number of the lug grooves is in a range of from 32 to 44 at each side in the tire width direction; a negative rate of a tread surface portion of the tread portion is in a range of from 15 to 30%; each of the lug grooves comprises a tapered groove portion wherein a groove width gradually becomes narrower such that a trapezoidal block portion having a short side at the shoulder side as seen from a tire tread surface side and having a tread surface which is formed in an isosceles trapezoidal shape is formed between the lug grooves in a tire peripheral direction, one side of each of the lug grooves is entirely formed of a straight section, and the other side of each of the lug grooves is formed of a straight section that is parallel to the one side and a tapered section which tapers toward an end of the one side to form the tapered groove portion; the tapered groove portion is formed such that a distance from a tread end extends beyond a one quarter point corresponding to one half of a length from the tread end to the tire equatorial plane, and the tapered section extends beyond the one quarter point; and an approximately middle point of an oblique line of the trapezoidal block portion is positioned at the one quarter point.