Tire comprising a tread with a foamed material

Abstract

The tyre comprises a tread (14) that has a running layer (14A) made of cellular material having a thickness E and a degree of expansion of greater than or equal to 50%. The running layer (14A) comprises hollow tread pattern elements (20, 22, 26). At least 95% of the hollow tread pattern elements (20, 22, 26) each satisfy the following two conditions a) and b): a) the tread pattern element (20, 22, 26) is separated from at least one other hollow tread pattern element (20, 22, 26) by a distance less than or equal to DP=7 mm, the separation distance between two hollow tread pattern elements (20, 22, 26) being the shortest distance between these two tread pattern elements (20, 22, 26) travelled in the cellular material, b) the tread pattern element (20, 22, 26) has a depth at least equal to 80% of the thickness E of the running layer (14A).

Dependencies are inferred from the claim text.