| 摘要 |
A land section (3) formed on a tread surface (1) has formed therein a closed sipe (5) comprising at least three cuts (4) which extend in the radial direction from an imaginary axis (2) as the center and terminate within the land section (3), said imaginary axis (2) extending in the direction of the depth of the land section (3). The cuts (4) are helically twisted about the imaginary axis (2) along the depth direction in such a manner that the angle (?) of the twist is set to be greater than or equal to 10° and less than 135° and that the width of the cuts (4) or the length of the cuts (4) in the radial direction is set to be greater on the tread surface (1) side than on the bottom surface side. |
