Patent ID: 6799617
Filing Date: 2004-10-05
Classification: B60C

Abstract:
A pneumatic tire comprising a tread comprising central blocks, shoulder blocks and intermediate blocks, the central blocks each defined such that at least 80% of the top face of the block is within a central region centered on tire equator and has a width of 25% of the tread width, the shoulder blocks each defined such that at least 80% of the top face of the block is within a shoulder region extending from each of tread edges to have a width of 12.5% of the tread width, the intermediate blocks each defined such that at least 80% of the top face of the block is within an intermediate region between the central region and each of the shoulder regions,whereinin the tread developed in a plane, the central blocks are arranged circumferentially of the tire at substantially constant pitch lengths P1,the intermediate blocks in each of the intermediate regions are arranged circumferentially of the tire at substantially constant pitch lengths P2,the shoulder blocks in each of the shoulder regions are arranged circumferentially of the tire at substantially constant pitch lengths P3,in a certain number (K) of circumferential positions, the central blocks are aligned with the intermediate blocks in the tire axial direction, the number (K) is in a range of from 6 to 32, said circumferential positions are provided circumferentially of the tire at regular intervals equal to the pitch length P1 multiplied by an integral number (n), the number (n) is in a range of from 3 to 8, the pitch length P2 and pitch length P3 are equal to the pitch length P1 multiplied by n/(nâˆ’1) or n/(nâˆ’2).