Patent ID: 7537033
Filing Date: 2009-05-26
Classification: B60C

Abstract:
1. A pneumatic tire comprising: a plurality of circumferential grooves extending in a tire circumferential direction in a tread surface having a width and a circumferential center; a plurality of lateral grooves extending from the circumferential grooves away from the circumferential center of the tread surface, the lateral grooves being open at their distal ends from the circumferential center of the tread surface and provided intermittently in the tire circumferential direction; and line portions provided in a wall face of the circumferential grooves, the line portions being composed of a plurality of ridges or recesses that are inclined from 10 ° to 35° with respect to the tire circumferential direction; wherein water can flow in the circumferential grooves along the line portions to form a vortex flow, and can be discharged from the circumferential grooves, and wherein the line portions are provided in a range of not less than 50% of the wall face of the circumferential grooves in a cross section of the circumferential grooves orthogonal to the groove longitudinal direction.