Tire for an Urban Bus Comprising a Tread with Improved Grip

A tire for a heavy-duty vehicle for urban use, comprising a tread intended to come into contact with the ground via a tread surface,

• the tread having a transverse width (W), measured between two transverse ends of the tread surface, along a transverse direction (YY′) parallel to an axis of revolution of the tire, and comprising cuts that delimit raised elements,
• every cut being delimited by two walls that intersect the tread surface along two edge corners,
• every cut having a thickness (E), measured on the tread surface-between the two edge corners, perpendicularly to the two edge corners, and a depth (P), measured between the tread surface and a cut bottom, perpendicularly to the tread surface,
• each wall forming, in any plane perpendicular to said wall, a taper angle (D1, D2) with the straight line (NN′) that passes through the edge corner, which is the intersection of said wall with the tread surface, and is perpendicular to the tread surface,
• wherein the tread comprises at least two zigzag and mutually parallel wide cuts, referred to as grooves, in that each zigzag groove is made up of alternating longitudinal portions, which are parallel to a longitudinal direction (XX′) of the tire, and oblique portions, each of which forms one and the same angle (A) with the longitudinal direction (XX′) at least equal to 15°, in that the depth (P) of each zigzag groove is at least equal to 7 mm, and in that the taper angle (D1, D2) of each wall that delimits each zigzag groove is at least equal to 10°.