Tire comprising a tread having grooves with undercut side faces and reinforcing elements

A tire comprising a tread having a contact surface for coming into contact with a carriageway when the tire is rolling, the tread comprising:

• at least one circumferential reinforcing element, at least a portion of a meridian cross-section of the at least one circumferential reinforcing element being in the shape of an obtuse triangle, a vertex of which is oriented radially toward the outside, and the at least one circumferential reinforcing element consisting of a rubber mixture with a dynamic shear modulus G* greater than a dynamic shear modulus G* of a main rubber mixture of the tread;
• at least two grooves extending at least partially circumferentially, each circumferential groove being delimited by a groove bottom and axially by two side faces;
• at least one tread block formed between two circumferential grooves, the at least one tread block having an axial width measured at a radial level corresponding substantially to the groove bottom,
• wherein at least one of the side faces is undercut, and
• wherein the at least one circumferential reinforcing element is arranged axially relative to the undercut side face at a non-zero distance d of between 0 and 15% of the axial width of the at least one tread block, the non-zero distance d being substantially constant extending radially from the inside toward the outside over an entire radial height h of the at least one circumferential reinforcing element and from a radial level situated above a wear limit level and to a radial height equal to 5% of a thickness p of the tread.