Patent ID: 7703491

Claim:
A pneumatic tire comprising: a tread area that is divided into a plurality of lands by a plurality of grooves formed in the tread area, wherein each of the grooves includes a plurality of protrusions arranged at intervals on a bottom of the groove, the protrusions are lower than the lands from the bottom of the groove, and separated from the lands, each of the protrusions includes a protrusion main body having a top portion that is a highest portion from the bottom of the groove; and a slope portion having a slope that makes an angle with the bottom of the groove in a range between 3 degrees and 60 degrees, and the slope portion is formed in at least one direction along the groove, wherein a joint is provided between two adjacent protrusions, a height of the joint is equal to or less than 1 millimeter from the bottom of the groove, the two adjacent protrusions are connected by the joint, and wherein the slope portion is formed in three directions or more with respect to the protrusion main body.