| 主权项 |
1. A pneumatic tire, comprising:
a plurality of land portions that are provided at a tread and that are partitioned by a plurality of circumferential direction grooves that extend along a tire circumferential direction; a lug groove that is provided at at least one land portion among the plurality of land portions and that crosses the land portion in a tire width direction; a fine groove that is provided at a groove bottom portion of the lug groove, that has a narrower groove width than the lug groove, and that has a groove bottom face formed with a circular arc shaped profile when viewed in cross-section at right angles to a groove length direction; a first curved face that is provided so as to couple one of mutually facing groove side faces of the lug groove to a groove side face of the circumferential direction grooves, and that extends toward a groove bottom face of the circumferential direction grooves; a second curved face that is provided so as to couple another of the mutually facing groove side faces of the lug groove to the groove side face of the circumferential direction grooves, and that extends toward the groove bottom face of the circumferential direction grooves; and a coupling curved face that is formed from a first extension line extending from a boundary line between the first curved face and the one groove side face of the lug groove and from a second extension line extending from a boundary line between the second curved face and the other groove side face of the lug groove, to the groove bottom face and a groove side face at a length direction end portion of the fine groove, to a groove side wall of the circumferential direction grooves, wherein the first extension line configures a boundary between the first curved face and the coupling curved face, and the second extension line configures a boundary between the second curved face and the coupling curved face. |
