The invention relates to a tire comprising a tread comprising a plurality of main grooves (1) disposed on either side of a median plane X-X ', each of these main grooves (1) opening axially to the outside of said tread and extending axially towards the median plane XX 'so that the plurality of main grooves form a generally V-shaped pattern, characterized in that, from a certain wear rate determined, at least one additional groove (3) appears between two circumferentially adjacent main grooves (N-1, N), said additional groove extending generally parallel to said main grooves (N-1, N).
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