Abstract: A pneumatic tire includes plural land portions that are provided at a tread and that are partitioned by plural circumferential direction grooves that extend along a tire circumferential direction. A lug groove is provided at at least one land portion among the plural land portions and crosses the land portion in a tire width direction. A fine groove is provided at a groove bottom portion of the lug groove, has a narrower groove width than the lug groove, and 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 coupling curved face joins the groove bottom face and a groove side face at a length direction end portion of the fine groove, to a groove side face of the circumferential direction grooves.

Abstract: In a pneumatic tire, blocks 11 each have a block width that is increased from circumferential end portions to a circumferential middle portion of the block 11 in a manner such that widthwise end portions 10 located on both ends in the tread width direction are positioned in a circumferentially intermediate portion of the block 11 and also have the maximum circumferential length that is larger than the maximum width of the block 11, thereby having, in its plan view, a polygonal contour shape that includes end sides 11a located in the circumferential end portions, and circumferential distances a and a1 between a circumferential middle position 11b of each end side 11a of the block 11 and a circumferential middle position 10a of a line L connecting the widthwise end portions 10 of the block 11 are both twice or more of the maximum depth of circumferential grooves.

Abstract: A pneumatic tire includes plural land portions that are provided at a tread and that are partitioned by plural circumferential direction grooves that extend along a tire circumferential direction. A lug groove is provided at at least one land portion among the plural land portions and crosses the land portion in a tire width direction. A fine groove is provided at a groove bottom portion of the lug groove, has a narrower groove width than the lug groove, and 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 coupling curved face joins the groove bottom face and a groove side face at a length direction end portion of the fine groove, to a groove side face of the circumferential direction grooves.

Abstract: In a pneumatic tire, blocks 11 each have a block width that is increased from circumferential end portions to a circumferential middle portion of the block 11 in a manner such that widthwise end portions 10 located on both ends in the tread width direction are positioned in a circumferentially intermediate portion of the block 11 and also have the maximum circumferential length that is larger than the maximum width of the block 11, thereby having, in its plan view, a polygonal contour shape that includes end sides 11a located in the circumferential end portions, and circumferential distances a and a1 between a circumferential middle position 11b of each end side 11a of the block 11 and a circumferential middle position 10a of a line L connecting the widthwise end portions 10 of the block 11 are both twice or more of the maximum depth of circumferential grooves.