Michelin Recherche Et Technique S.a.

Societe Detechnologie Michelin

Renaud Durand

Charles Bradford Weaver

Hiroshi Ishikawa

Pneumatic tire

Tread for pneumatic tires

A tread () comprising a plurality of grooves of longitudinal and transverse general orientation (), the grooves of longitudinal orientation comprising main grooves () of depth G and secondary grooves () of depth G' less than the depth G of the main grooves, the central part (C) of the tread, defined axially by two grooves of longitudinal orientation, and of a width of between 0.25 and 0.5 times the width W of the tread, being provided with at least one main groove () of longitudinal orientation and of average depth G. The depth G&#x2032; of the secondary grooves () is between 0.4 and 0.6 times the depth G of the main grooves (). The transverse grooves () of the ribs of the central part (C) comprise over at most half of their length a connecting bridge (), the surface radially to the outside of which is at a distance Hc from the running surface of between 0.4 and 0.8 times the depth G of the main grooves. The transverse grooves () of the ribs of each edge (B) comprise over at most half of their length a connecting bridge () which prevents closure of said transverse grooves. The surface radially to the outside is at a distance Hs from the running surface which is at most equal to 0.3 times the depth G of the main grooves.

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Bangkok, Thailand

Renaud Durand