| 摘要 |
PURPOSE:To effectively prevent shoulder drop wear, especially, by forming a specific longitudinal groove in a tread to divide it into a shoulder part and a crown part and also forming the shoulder part and the crown part from a plurality of or single specific rubber pile. CONSTITUTION:A plurality of circumferentially successive longitudinal grooves 6a and 6b are formed on the surface of the tread 5 of a tyre 1, whereby dividing the tread 5 into the shoulder part SH and the crown part CE. The shoulder part SH is made from multiple lamination of both cap rubber piles CS and base rubber piles BS. And the crown part CE is made from a single lamination block consisting of crown rubber piles R. Each of the longitudinal grooves 6a and 6b is formed on the tread 5 in such a way that the border face (a) between the cap rubber piles CS and the crown rubber piles R contains the border line (b) shown on the surface of the tread 5. |
