Patent ID: 8800618

Claim:
A pneumatic tire having lug grooves arranged in a tread in a direction intersecting a circumferential direction of the tire and arranged in the circumferential direction of the tire, and land portions divided by the lug grooves, wherein when a distance from a ground-contact end to a tire equatorial plane is defined as L in a state in which the tire is assembled to a normal rim and a normal internal pressure is charged into the tire and a normal load is applied to the tire, in a region where a distance from the tire equatorial plane to an axial outer side of the tire is in a range of from 0.45L to 0.55L, a step portion which is a boundary between a tread side groove wall and a tire center side groove wall is respectively provided on both sides of the lug groove, an average groove width at the tread side of the step portions is widened toward the axial outer side of the tire and a width of the step portion is increased toward the axial outer side of the tire, and the tread side groove walls at a tread-in end and a kicking end of the land portion are inclined in opposite directions to each other with respect to an axial direction of the tire, wherein a depth position where the step portion is formed is a position of from 0.3 to 0.7 times of a groove depth of the lug groove from the tread side to the tire center side, and wherein in a region where the distance from the tire equatorial plane is in a range of from 0.55L to the axial outer side of the tire: an average width of the lug groove is substantially constant, and an average width between the tire center side groove walls is decreased toward the axial outer side of the tire.