| 摘要 |
A pneumatic vehicle tyre has tread surface profile elements 41 to 417 which have grooves of different lengths. These grooves may be combined with fine grooves (9) (Figs 4, 5, 7). As a result of such grooves being distributed irregularly, the vibration frequencies of the profile elements are split into a broad frequency spectrum, so that the noise level produced by the tyre is substantially reduced. The profile elements may be at angles of 45 DEG to 90 DEG with respect to the central plane of the tyre. <IMAGE>
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