Abstract: A tire tread includes at least one longitudinal rib limited by grooves. Each rib includes a plurality of incisions each opening into the grooves. Each incision has at least three parts at least two at least of these parts being of essentially transverse orientation and opening into the grooves. At least one other part is oriented essentially in the longitudinal direction. All parts of the incision of essentially longitudinal orientation are devoid any structure for blocking relative movement between the opposing faces of the incision. The parts of essentially transverse orientation include structure for limiting the amplitude of the relative movements of these faces at least in the direction of the thickness of the tread.

Abstract: A tire tread includes at lest one longitudinal rib limited by grooves. Each rib includes a plurality of incisions each opening into the grooves. Each incision has at least three parts at least two at least of these parts being of essentially transverse orientation and opening into the grooves. At least one other part is oriented essentially in the longitudinal direction. All parts of the incision of essentially longitudinal orientation are devoid any structure for blocking relative movement between the opposing faces of the incision. The parts of essentially transverse orientation include structure for limiting the amplitude of the relative movements of these faces at least in the direction of the thickness of the tread.

Abstract: A tire tread having grooves of transverse general orientation defining a plurality of blocks arranged so as to form a tread pattern having a preferred direction of travel, the blocks having a contact face, two lateral faces, a leading face forming an angle a greater than 90° with the contact face and a trailing face. For at least one tread pattern block, the trailing face of the block is formed of an upper part extending from the running face of the block which is extended towards the inside of the tread by a lower part. Furthermore, the upper part of the trailing face is undercut and forms an angle &bgr; of less than 90° with the contact face, whereas the lower part, which is inclined so as to form an angle &dgr; greater than 90° with the contact face, is provided with at least one recess which extends into the interior of the block.

Abstract: A tread for a tire having a preferred direction of travel has a plurality of tread pattern blocks, the upper faces of which are intended to come into contact with the roadway during travel of the tire. The tread pattern blocks are provided with a plurality of wells of section S and of depth H, each block being divided into a front section and a rear section by a median plane Pv perpendicular to the upper contact face of the block and to the longitudinal direction of the tread and passing through the center of mass G of the contact face of the block when new. The front section has a leading edge and the rear section has a trailing edge. This tread is characterized in that, when new and for each tread pattern block which is provided with wells, the volume of all the wells located in the front section of the block is greater than the volume of all the wells located in the rear section of the block.