Patent ID: 9221304
Filing Date: 2015-12-29
Classification: B60C

Abstract:
1. A tire comprising: a plurality of rib-shaped land portions which extend in a tire circumferential direction; and a circumferential groove positioned between the land portions and extending in the tire circumferential direction, wherein the circumferential groove is formed with an intra-groove groove recessed farther inward in a tire radial direction than the circumferential groove with a groove bottom of the circumferential groove being an upper end of the intra-groove groove, the intra-groove groove includes: a high-angle groove section in which an angle formed between a straight line perpendicular to a tire equator line and the intra-groove groove is equal to or more than a predetermined angle, and a low-angle groove section in which an angle formed between the straight line and the intra-groove groove is smaller than the predetermined angle, and which is continuous with the high-angle groove section, the high-angle groove section is positioned closer, than the low-angle groove section, to an intra-groove center line passing through a center of a tread width direction of the circumferential groove, and a width perpendicular to an extension direction of the high-angle groove section is wider than a width perpendicular to an extension direction of the low-angle groove section, wherein the low-angle groove section is provided at both ends of the high-angle groove section.