Patent ID: 9346323
Filing Date: 2016-05-24
CPC Classification: B60C

Claim Text:
1. A pneumatic tire comprising: three circumferential main grooves; one circumferential narrow groove having a groove width that is less than that of the circumferential main grooves; and one row of center land portion, a pair of left and right second land portions, and a pair of left and right shoulder land portions partitioned and formed by the circumferential main grooves and the circumferential narrow groove in a tread portion, wherein when the second land portion and the shoulder land portion in a first region demarcated by the center land portion are referred to as an inner side second land portion and an inner side shoulder land portion, and the second land portion and the shoulder land portion in a second region are referred to as an outer side second land portion and an outer side shoulder land portion, the circumferential narrow groove is disposed at a position that partitions the outer side second land portion and the outer side shoulder land portion, the center land portion is a rib that is continuous in a tire circumferential direction, the inner side second land portion and the outer side second land portion are rows of blocks divided in the tire circumferential direction by a plurality of lug grooves, a groove area ratio S a groove width Wd of the circumferential narrow groove and a maximum groove width Wmax of the other three circumferential main grooves have a relationship such that 3.1≦Wmax/Wd≦5.0.