Tyre comprising a tread, this tread of thickness E including: - a rolling surface intended to come into contact with the ground, - at least one circumferential row of upstanding elements, these upstanding elements being separated from one another in the circumferential direction by incisions of transverse or substantially transverse orientation, - each incision of transverse or substantially transverse orientation leading onto the rolling surface and having a depth P at most equal to the thickness E of the tread, each incision forming on the rolling surface of the tyre when new two facing edges (21, 22), these edges (21, 22) delimiting at least one narrow portion of the incision, i.e. a portion having a mean width LE less than or equal to 2 mm, and at last one wide portion of the incision, i.e. a portion having a mean width LL greater than 2 mm, these wide and narrow portions being disposed alternately, each narrow portion and each wide portion extending the full depth P of the incision, each wide portion having a volume for the most part between half the depth P of the cutout and the depth P, this tire being characterized in that the following condition is satisfied: 0.90 × E / R < sum LE / Pr < 1.10 × E / R, in which: - (sum LE) is the sum of the mean widths LE of the narrow portions of all the incisions separating the upstanding elements of the same row on a circle centred on the rotation axis of the tyre, - R is the mean radius of the circle centred on the rotation axis on the rolling surface of the row concerned when new and Pr is the mean perimeter of the circle centred on the rotation axis and passing through a circumferential series of incisions, - E is the mean thickness of the tread at the level of the row concerned. - a rolling surface intended to come into contact with the ground, - at least one circumferential row of upstanding elements, these upstanding elements being separated from one another in the circumferential direction by incisions of transverse or substantially transverse orientation, - each incision of transverse or substantially transverse orientation leading onto the rolling surface and having a depth P at most equal to the thickness E of the tread, each incision forming on the rolling surface of the tyre when new two facing edges (21, 22), these edges (21, 22) delimiting at least one narrow portion of the incision, i.e. a portion having a mean width LE less than or equal to 2 mm, and at last one wide portion of the incision, i.e. a portion having a mean width LL greater than 2 mm, these wide and narrow portions being disposed alternately, each narrow portion and each wide portion extending the full depth P of the incision, each wide portion having a volume for the most part between half the depth P of the cutout and the depth P, - (sum LE) is the sum of the mean widths LE of the narrow portions of all the incisions separating the upstanding elements of the same row on a circle centred on the rotation axis of the tyre, - R is the mean radius of the circle centred on the rotation axis on the rolling surface of the row concerned when new and Pr is the mean perimeter of the circle centred on the rotation axis and passing through a circumferential series of incisions, - E is the mean thickness of the tread at the level of the row concerned.