Patent ID: 9493039
Filing Date: 2016-11-15
CPC Classification: B60C

Claim Text:
1. A pneumatic tire comprising: a tread portion provided with a unidirectional tread pattern having an intended tire rotational direction and defined by circumferentially continuously extending five main grooves dividing the tread portion into six rows of circumferentially arranged blocks which are a pair of axially inner rows of crown blocks circumferentially divided by crown axial grooves, a pair of axially outer rows of shoulder blocks circumferentially divided by shoulder axial grooves and a pair of in-between rows of middle blocks circumferentially divided by middle axial grooves, wherein an imaginary crown region, which is defined between two lines extending parallel with the tire circumferential direction passing through both axially outermost ends of the crown blocks in each of the axially inner rows, has a land ratio of from 0.75 to 0.85, an imaginary middle region, which is defined between two lines extending parallel with the tire circumferential direction passing through both axial ends of the middle blocks in each of the in-between rows, has a land ratio of from 0.65 to 0.75, the land ratio of the imaginary crown region is in a range of from 1.05 to 1.25 times the land ratio of the imaginary middle region, the five main grooves are a central main groove extending straight in the tire circumferential direction, two middle main grooves extending zigzag in the tire circumferential direction, and two shoulder main grooves extending zigzag in the tire circumferential direction, the crown axial grooves and the middle axial grooves are each inclined to the intended tire rotational direction toward the axially inside of the tire, the crown axial grooves and the middle axial grooves each have a widths of from 4.0 to 7.0 mm, and the widths of the crown axial grooves are more than the width of the central main groove and less than the widths of the middle main grooves next to the central main groove, each of the crown blocks is provided with the ground contacting top surface of each of the crown blocks is provided with no void other than the inside notch and the outside notch, each of the shoulder blocks is provided with the ground contacting top surface of each of the shoulder blocks is provided with no void other than the inside notch and the outside notch, and each of the middle blocks has