Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissements Michelin

Alain Durand

Walid Djabour

Philippe Gervais

Jean Luc Rieu

A tire with radial carcass reinforcement, comprising a crown reinforcement, itself capped radially by a tread connected to two beads by two sidewalls, the said tread comprising at least two radially superposed layers of polymer compound, a first layer of filled elastomeric compound, constituting the radially outer part of the tread, has a macrodispersion score Z higher than 80 and a maximum tan(&#x3b4;) value, denoted tan(&#x3b4;)max, lower than 0.130 and a second layer of elastomeric compound radially on the inside of the said first layer of elastomeric compound has an elongation at break at 60&#xb0; C. that is higher than 600%.

Tire comprising a tread made up of several elastomeric compounds

Tire tread

A tire tread comprising a plurality of grooves opening on to a running surface, each groove having an average orientation and being defined by facing walls, these walls being connected together by a groove bottom, each groove being defined geometrically by a transverse profile obtained by intersecting said groove by a section plane substantially transverse to the average direction of the groove, the transverse profile of a plurality of grooves having variable curvatures, the variation of said curvatures in the section plane being mathematically continuous. A tire provided with such a tread.

Transverse tread groove profile

Pneumatic tire

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Clermont-Ferrand, France

Alain Durand