| 摘要 |
PURPOSE: To prevent the development of the heel-and-toa abrasion to the inside of a tread by forming the parts having the large and small rigidity, by forming a zigzag longitudinal fine groove on the inside in the axial direction from the starting point of the lug grooves arranged in the tire circumferential direction at a shoulder part. CONSTITUTION: A lug groove 4 which is opened in a buttless part from the starting point 4A at the position at a distance Z of 0.05-0.115 times of TW from the tread edge E and has a groove depth of 1.02-1.12 times of the groove depth D of a longitudinal main groove 2 is formed at the shoulder land part 3 between the tread edge E and the longitudinal main groove 2 having the groove width in 4-12% of the tread width TW. Further, a zigzag shaped longitudinal fine groove 5 having a groove width less than 1.2mm and a groove depth in 0.6-0.9 times D is arranged between the starting point 4A and the longitudinal main groove 2, and the innermost side position S in the axial direction of a bent part is set far from the distance Y in 0.55-0.70 times of the difference between the width X in the axial direction of a shoulder land part 3 and the distance Z, from the edge E, between the starting point 4A and the longitudinal main groove 2, and the crossing angleθof the zigzag part is set to 130-180 deg.. Accordingly, the heel-and-toe abrasion quantity can be reduced, and the abrasion resistance and the wet performance can be improved. |
