| 摘要 |
<p>A pneumatic tire (1) is described comprising: a carcass structure (2) having at least one carcass ply (2a), and at least one annular reinforcing structure (3) associated to said carcass ply (2a), a pair of axially opposite side walls (7, 8) on the carcass structure (2), a belt structure (5) arranged at a radially outer position with respect to the carcass structure (2) and a tread band (6), arranged at a radially outer position with respect to the belt structure (5), and generally consisting of a first elastomeric material incorporating at least one portion substantially consisting of a second elastomeric material; wherein the tread band (6) comprises at least one groove (11) defined in the at least one portion substantially consisting of the second elastomeric material; wherein the ratio between the modulus of elasticity (E') under compression at 100°C of the second elastomeric material and the modulus of elasticity (E') under compression at 100°C of the first elastomeric material is not lower than about 1.30; and wherein the ratio between the IRHD hardness at 100°C of the second elastomeric material, measured in accordance with standard ISO 48, and the IRHD hardness at 100°C of the first elastomeric material, measured in accordance with standard ISO 48, is lower than about 1.10.</p> |
