Tire comprising a tread having a tread surface (11) and comprising a plurality of grooves (2) of generally circumferential orientation and of depth H, these grooves (2) defining a plurality of rubber elements (3, 30), at least one of which comprises a plurality of cavities (6), each cavity (6) of volume Vc of generally elongate shape with a total length Lc and being designed to communicate with a single groove (2) of generally circumferential orientation, each cavity (6) being extended all the way along its length Lc by an incision (80) which extends radially outwardly to emerge at the tread surface (11), this tire being such that the incision (80) comprises an incision portion (81) beginning at the cavity and forming an angle A of at least 10° with a line perpendicular to the tread surface and passing through the point of intersection of the incision with the cavity (6).