| 摘要 |
<p>A high and medium performance tyre for vehicles comprises a tread band divided into three portions, i.e. a central portion (11) and two shoulder portions (51, 52), respectively, where the central portion (11) comprises a plurality of circumferential grooves (7, 8) intersected by a plurality of transverse recesses (9) distributed in the form of two circumferential series of recesses located axially opposite each other and inclined in the opposite sense with respect to the circumferential direction. In each series, the recesses are arranged in succession in groups of three, alternating with groups of three recesses of the other series. The circumferential grooves (7, 8) have a V-shaped right cross section with the rounded vertex directed radially inwards, having a width greater than and a depth less than that of the transverse recesses (9) which have a U-shaped right cross section; preferably the two right cross sections have the same surface area.</p> |
