| 摘要 |
PURPOSE: To improve a biased abrasion resistance while a drain function and a traction function, which are the natural functions of a block pattern, are maintained. CONSTITUTION: When it is assumed that the groove depth from the surface 1a of a block 1 to a groove bottom 2 is h, the thickness of a rubber layer from the groove bottom to the upper end of a belt isα, and the length of the surface 1a of the block 1 is A, the relation between the height of the block and the dimension of the block surface is expressed by 1.5(h+0.5α< A<2.0(h+0.5α). (Herein, the length of the block surface is expressed by A=ΣS/ W-ΣWG, assuming thatΣS is the surface area of a tread part for one pitch (one block in the circumferential direction) included in the distance W between both ground ends of a tread andΣWG is a total of the widths in the lateral direction of the longitudinal grooves of a tire. |
