Tyre

A tyre comprising a tread band on which a plurality of grooves is provided;

• at least one block defined by said plurality of grooves;
• at least one sipe of complex shape provided on said at least one block defining a first and a second block portions separated from each other by said sipe, as well as a first and a second surfaces, respectively, on said first and second block portions, facing each other in a region of said sipe of complex shape, each of said first and second surfaces extending along a plane of reference incident to a tread surface radially external to said tread band, a longitudinal direction, substantially parallel with said tread surface, and a transverse direction substantially perpendicular to said longitudinal direction, being defined in said plane of reference, wherein on at least one of said first and second surfaces at least one first protuberance is provided, a projection of which in said transverse direction is at least partially superimposed on the projection in said transverse direction of the other of said first and second surfaces, and a vertex of which is positioned at a first depth from said tread surface measured in said transverse direction, said vertex being connected to said plane of reference via a first connecting surface facing toward a radially outer side of said sipe and a second connecting surface facing toward a radially inner side of said sipe, said first connecting surface being inclined with respect to said plane of reference at an angle of between about 50° and about 90° and said second connecting surface being inclined with respect to said plane of reference at an angle of between about 0° and about 50°.