Patent ID: 7281555

Claim:
An off-the-road tire having a gauge of a tread rubber within a range of 60-200 mm, in which a plurality of widthwise grooves extending substantially in a widthwise direction of the tire are arranged in each side region of the tread, and a pair of circumferential fine grooves continuously extending zigzag in a circumferential direction of the tire are arranged in a central zone of the tread, and a groove bottom of only an end portion of a straightforward extending portion in the zigzag circumferential fine groove is rendered into a raised bottom at an end portion located toward a side edge of the tread and/or an end portion located toward the side of the tread center, and a plurality of widthwise fine grooves extending substantially in the widthwise direction of the tire and contacting their groove walls with each other in a ground contact area are arranged between these circumferential fine grooves, and wherein the groove width of the circumferential fine groove is rendered into a width contacting the groove walls with each other in a ground contact face.