Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Luc Schaffhauser

Vincent Tourneux

Laurent Huc

Tire comprising a tread () extending between an outboard axial edge () and an inboard axial edge (), over a width L, in which the tread comprises at least 4 circumferential ribs (-) separated by grooves (-), in which the circumferential rib () adjacent to the outboard axial edge of the tread extends from the outboard axial edge over a width of at least 0.6&#xb7;L and comprises a portion () with a width of at least 0.1&#xb7;L made from a first rubber composition and an axially adjacent second portion () made from a second rubber composition, the first rubber composition having values for the elastic modulus at 300% deformation, the Shore A hardness and the complex modulus G* at 60&#xb0; C. which are respectively comprised between 1.1 and 2.1 times, 0.95 times and 1.20 times, and 1.00 times and 2.10 times the corresponding values of the second rubber composition.

Tire comprising an improved tread

Tire comprising two beads and a carcass reinforcement anchored in each bead, each bead comprising a plurality of annular reinforcing structures forming at least one anchoring alignment, parallel to a portion of the carcass reinforcement, and an additional stiffening reinforcement formed by one single alignment of at least two annular reinforcing structures and extending between a first end situated a distance Hfrom the tangent to the seat-forming bead portion being 20-70% of the anchoring alignment minimum distance H, the first end lying an axial distance Lfrom the interior surface of the tire being 50-85% of the maximum axial width Lof the bead; and a second end, the second end being radially and axially at the same level as or on the outside of the first end such that the distance LA separating the first and second ends is &#x2267;30% of the mean anchoring alignment length.

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Chamalieres, France

Luc Schaffhauser