A tire tread including a tread surface adapted to come into contact with a road surface has at least one main groove that, when new, opens onto the tread surface of the tread, this main groove having a maximum depth. The main groove includes a plurality of first groove portions and a plurality of second groove portions, the first and second groove portions being arranged alternately such that a first portion is followed by a second portion. Each first groove portion has a width that decreases with wear, and each second groove portion has a width that increases with wear.