Patent ID: 7387696
Filing Date: 2008-06-17
Classification: B60C

Abstract:
1. A method for optimizing and reducing the running noise of a tire provided with a tread having a tread pattern formed of a plurality of tread pattern motifs, this method comprising the following steps: A—forming a first annular distribution from at least two groups of motifs of different respective lengths, this first distribution comprising Ni groups, the ratio between the shortest length and the longest length in the longitudinal direction being equal to Ri; B—creating a second annular distribution from at least two groups of motifs of different respective lengths, this second distribution comprising Nj groups, the ratio between the shortest length and the longest length in the longitudinal direction being equal to Rj; C—calculating a value of an amount of overlap Tij and of the estimated overall pitch ratio R D—comparing the calculated value of Tij with a desired value of between 0.20 and 0.50 and comparing the calculated value of R E—if this calculated value of Tij is not between 0.20 and 0.50 or if the calculated value of R