| 摘要 |
Tyre (1 ) having a tread (2) comprising a central portion (L1 ) astride an equatorial plane (X-X) and two shoulder portions (L2.L3), wherein the shoulder portions (L2; L3) each have at least one row of lateral blocks (13;14), circumferentially separated from one another by shoulder transverse grooves (23;28); the central portion (L1 ) has a void-to-rubber ratio lower than 0,25 and comprises a first and a second row (9; 10) of central blocks; each block (32) of the first central row (9) being substantially axially aligned with a block (33) of the second row for defining a first transverse drainage channel (70), substantially continuous, which crosses the central portion (L1 ); the first transverse drainage channel (70) being defined between a first pair of blocks, formed by a block (32) of the first row (9) and a block (33) of the second row (10) arranged axially side by side, and the first circumferentially adjacent pair of blocks, formed in a similar way; each block (32) of the first row (9) has an extension direction, forming an angle a1 between 45° and 80° to the equatorial plane (X-X), and each block (33) of the second row (10) lies on the extension direction of the circumferentially preceding block (32) of the first row (9) such as to define an inclined and substantially continuous second drainage channel (71 ) which crosses the central portion (L1 ). |
