Tire comprising a tread

A tire comprising a directional tread, said tread comprising:

• two edges and a centre (C) dividing said tread into two parts of substantially equal width,
• said tread comprising, on one of the two parts of said tread, a plurality of sets of blocks,
• each set of blocks comprising at least one block,
• each set of blocks extending from one of the edges of the tread until the centre (C) of said tread with a non-zero curvature,
• each set of blocks comprising an edge zone near an edge of the tread, a central zone at the centre of said tread, and an intermediate zone between the edge zone and the central zone,
• each set of blocks comprising a set of chamfers comprising at least one chamfer, said set of chamfers extending over the edge zone, the central zone and the intermediate zone of the set of blocks,
• wherein a width LC2 of the set of chamfers over the intermediate zone is different from a width LC3 of the set of chamfers over the central zone, said widths LC2 and LC3 being comprised between 0.5 mm and 2.5 mm, a width of a chamfer corresponding to a distance between the radially outermost point of the chamfer and the radially innermost point of this chamfer in a groove, projected onto a tread surface of the tread, and measured in the circumferential direction,
• wherein the set of chamfers has an inclined wall extending radially inward from the tread surface of the tread to a vertical edge face, and
• wherein an intermediate zone angle of inclination is between 30 degrees and 50 degrees, and a central zone angle of inclination is between 30 degrees and 50 degrees.