| 摘要 |
PURPOSE:To form circumferential grooves for dividing blocks in a tread and decrease pattern noise or the like by combining a plurality of groove elements respectively having asymmetrical sections in a circumferential direction with constant intervals and provision of horizontal grooves as joints. CONSTITUTION:In a tread portion T of a tire, many circumferential grooves 4-1 to 4-4 and many horizontal grooves 2 are respectively provided. Many block columns 3-1 to 3-5 are divided thereby. The sectional form of the respective circumferential grooves adjacent in the circumferential direction is asymmetrically made. The respective circumferential grooves having at least two types of asymmetrical sectional shapes are combined in the circumferential direction with a constant space by making the horizontal grooves as joints. For example, the respective circumferential grooves 1-2, 1-3 make a section of a part located at a block to divided by the horizontal groove 2 in the block column 3-3 sandwiched therebetween asymmetrical. |
