Abstract: Tyre for vehicle wheels, comprising a tread band having a plurality of blocks, at least some of said blocks comprising at least one sipe (30) extending from an axially outer portion of the block up to an axially inner portion of the block along a predetermined trajectory and from a radially outer face of the block towards a radially inner portion of the block. The sipe (30) comprises, in any cross-section perpendicular to said predetermined trajectory, a main portion (400) having a first radial dimension and a first transversal dimension and, in a radially inner position with respect to the main portion (400) and adjacent to the radially inner portion of the block, a bottom portion (450) having a second radial dimension smaller than the first radial dimension and a second transversal dimension greater than the first transversal dimension.

Abstract: Tyre for vehicle wheels, comprising a tread band having a plurality of blocks, at least some of said blocks comprising at least one sipe (30) extending from an axially outer portion of the block up to an axially inner portion of the block along a predetermined trajectory and from a radially outer face of the block towards a radially inner portion of the block. The sipe (30) comprises, in any cross-section perpendicular to said predetermined trajectory, a main portion (400) having a first radial dimension and a first transversal dimension and, in a radially inner position with respect to the main portion (400) and adjacent to the radially inner portion of the block, a bottom portion (450) having a second radial dimension smaller than the first radial dimension and a second transversal dimension greater than the first transversal dimension.

Abstract: A tire for vehicle wheels, in particular for heavy load vehicle wheels, has a tread band including 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 is separated from a respective annular shoulder portion by a respective circumferential groove. The annular central portion includes a plurality of blocks arranged along at least one circumferential row between two circumferential grooves and at least one transversal sipe arranged between two circumferentially consecutive blocks. The transversal sipe has a main surface oriented in a substantially radial direction and provided with at least one deformation defining, in the adjacent blocks, respective portions of mutual constraint. The deformation has an overall decreasing width from an axial end of the sipe to a central zone thereof and has a radial extension smaller than that of the aforementioned main surface.

Abstract: A tyre for vehicle wheels, in particular for heavy load vehicle wheels, has a tread band including 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 is separated from a respective annular shoulder portion by a respective circumferential groove. The annular central portion includes a plurality of blocks arranged along at least one circumferential row between two circumferential grooves and at least one transversal sipe arranged between two circumferentially consecutive blocks. The transversal sipe has a main surface oriented in a substantially radial direction and provided with at least one deformation defining, in the adjacent blocks, respective portions of mutual constraint. The deformation has an overall decreasing width from an axial end of the sipe to a central zone thereof and has a radial extension smaller than that of the aforementioned main surface.