Tread for a pneumatic tire and a pneumatic tire

A tread for a pneumatic tire, the tread having a plurality of tread components each having a respective contact surface, wherein at least one of the tread components comprises a sipe having a sipe extension and a sipe depth along a direction of wear substantially orthogonal to the contact surface,

• wherein the sipe has at least two sections along the direction of wear having respective differentiated conformations, such that an intersection profile between the sipe and a surface parallel to the contact surface of the tread is different for each of the at least two sections, wherein at least one section of the at least two sections has a variable depth along the sipe extension, and wherein the at least two sections include a surface section,
• wherein the at least two sections are connected by a transition section which defines a transition line between the surface section and the transition section,
• wherein the variable depth of the surface section presents a maximum depth and a minimum depth, the variable depth varying in a continuous manner between the maximum depth and the minimum depth with respect to the transition line along the sipe extension,
• wherein the surface section has a substantially twisted conformation, arranged in such a manner that a surface parallel to the contact surface of the tread always intersects the surface section along a straight line that is oriented differently with respect to a longitudinal extension line of the tread as a function of depth, and
• wherein the sipe has a sipe thickness that is constant along all of the at least two sections and the transition section.