Tyre for vehicle wheels

A tyre for a vehicle wheel, having a tread band comprising an annular central portion astride an equatorial plane and two annular shoulder portions arranged on axially opposite sides with respect to the annular central portion, the annular central portion being separated from each annular shoulder portion by a respective circumferential groove, wherein the annular central portion comprises a plurality of blocks arranged along at least one circumferential row between two circumferential grooves, and at least one transversal sipe capable of being adapted to define two circumferentially consecutive blocks, wherein the transversal sipe has a main surface oriented in a substantially radial direction and provided with at least one deformation defining, in adjacent circumferentially consecutive blocks, respective portions of mutual constraint, wherein said deformation has an overall decreasing width from an axial end of the sipe to a central zone thereof, wherein said deformation has a radial extension smaller than that of said main surface and extends radially more outwardly proceeding from the axial end of the sipe toward the central zone thereof.