Pneumatic tyre.

摘要

A pneumatic tyre including a tread (2) having a plurality of rows of pattern elements extending in the circumferentially direction of the tyre to provide a tread pattern, the pitch of each row of pattern elements being varied in the circumferential direction of the tyre characterised in that a joint portion of one of the outer components of the tyre is positioned in a region of the tyre where at least 8% of the pattern elements whose pitch is different to the average pitch are consecutively provided so that the rigidity of the joint portion is balanced by the resultant rigidity of the pattern elements in said zone to reduce the radial force variation in the tyre. In one arrangement the joint portion of the tread is positioned where at least 8% of the pattern elements have a pitch less than the average pitch. Alternatively or in addition the tyre may have a steel belt and a reinforcement layer over the belt which has its joint in the region where at least 8% of the elements have a pitch greater than the average pitch.