Abstract: A pneumatic tire comprises a tread provided with at least two circumferential main grooves and a rib defined in a tread central portion by the circumferential main grooves, wherein an auxiliary groove is formed in the tread central portion, the auxiliary groove having a circumferential groove portion extending in a tire equator direction and an axial groove portion extending from an end of the circumferential groove portion in such a manner that the axial groove portion is bent at an acute angle to the circumferential groove portion, and at least an end of the auxiliary groove is open into the circumferential main groove.

Abstract: There is provided a pneumatic tire sufficiently improving drainage performance, driving stability, uneven wear resistance and quiet performance. A pneumatic tire 1 has at least one tire circumferential groove 9 extending along the tire circumferential direction in a tread portion 2. In addition, there are provided in a surface of the tread portion, a plurality of inclined grooves consisting of two or more small grooves 10 inclined at the same direction with respect to the tire circumferential direction and having an inclination angle within a range between 10 degrees and 60 degrees and configured in a zig-zag manner by coupling ends of the small grooves 10. The inclined grooves 11 are included in any widthwise section of the tread portion 2 of the tire and a part of the inclined grooves 11 is opened to the tire circumferential groove 9.

Abstract: There is provided a pneumatic tire sufficiently improving drainage performance, driving stability, uneven wear resistance and quiet performance. A pneumatic tire 1 has at least one tire circumferential groove 9 extending along the tire circumferential direction in a tread portion 2. In addition, there are provided in a surface of the tread portion, a plurality of inclined grooves consisting of two or more small grooves 10 inclined at the same direction with respect to the tire circumferential direction and having an inclination angle within a range between 10 degrees and 60 degrees and configured in a zig-zag manner by coupling ends of the small grooves 10. The inclined grooves 11 are included in any widthwise section of the tread portion 2 of the tire and a part of the inclined grooves 11 is opened to the tire circumferential groove 9.

Abstract: A pneumatic tire comprises a tread provided with at least two circumferential main grooves and a rib defined in a tread central portion by the circumferential main grooves, wherein an auxiliary groove is formed in the tread central portion, the auxiliary groove having a circumferential groove portion extending in a tire equator direction and an axial groove portion extending from an end of the circumferential groove portion in such a manner that the axial groove portion is bent at an acute angle to the circumferential groove portion, and at least an end of the auxiliary groove is open into the circumferential main groove.