Tire Tread Comprising Wavy Grooves and Sipes

A tire tread comprising a tread surface, a thickness of material to be worn away during running, this tread being provided with a tread pattern formed by at least two longitudinally oriented grooves opening onto the tread surface of the tread, and of which at least one is a wavy groove, this tread comprising at least one rib oriented in the longitudinal direction of the tread and delimited by said at least one wavy groove, each wavy groove comprising external cavities opening onto the tread surface and internal cavities hidden within the thickness of the tread, the external cavities of each wavy groove opening onto the tread surface when new with a contour of which the longitudinally farthest-spaced endpoints (A, B) are separated by a longitudinal distance Lm, this distance Lm measuring the maximum longitudinal length of the contour of each external cavity, each external cavity having a depth Ho, the rib of width Ln comprising a plurality of transverse sipes, which is to say sipes oriented at 45 degrees or more to the longitudinal direction, made at a mean pitch Pi, the depth of these transverse sipes being at least equal to the depth Ho of the external cavities of the wavy groove delimiting said rib, wherein:

• the longitudinal length Lm of the contour of the external cavity is equal to or greater than an integer multiple N of the pitch Pi times an amount at most equal to 25% of this integer multiple N of the pitch Pi,
• when new, N+1 transverse sipes of the one same rib open into each open cavity bordering said rib, one of these transverse sipes opening near the end point A of the contour (310) at a distance D1 from this point A, another transverse sipe opening near the other end point B of the contour at a distance D2 from this point B, the difference between the two distances D1 and D2 being at most equal to 5 mm.