Patent ID: 7958921
Filing Date: 2011-06-14
Classification: B60C,Y10S

Abstract:
1. A pneumatic tire having a designated rotational direction, wherein-an entire area having a width 85% of a total tire width and a center area having a width 30% of the total tire width is defined in a tread portion, the pneumatic tire comprising: a center main groove that is positioned in the center area on a tire equatorial line and that extends in a tire circumferential direction, and subsidiary main grooves that are positioned in the center area on each side of the center main groove and extend in the tire circumferential direction; a plurality of angled grooves between the center main groove and each subsidiary main groove, wherein the plurality of angled grooves extend at an angle in a direction opposite the rotational direction and towards an outside in the tire width direction; a plurality of lateral grooves that extend at an angle, in a direction opposite the rotational direction, from each subsidiary main groove towards the outside in the tire width direction; blocks partitioned between the angled grooves and also partitioned between the lateral grooves; and a plurality of sub grooves in each block partitioned between the lateral grooves and extending from the lateral grooves towards the rotational direction; wherein an end of a leading side of the sub grooves is closed, and a total length of an edge on the tread surface of the blocks in the center area is from 40% to 60% of a total length of an edge on the tread surface of the blocks in the entire area.