Abstract: Tire comprising at least one carcass-type reinforcing structure anchored on each side of said tire in a bead whose base is intended to be mounted on a rim seat, each of said beads extending generally radially outwardly in the form of sidewalls, the sidewalls being connected radially towards the outside to a tread, the carcass-type reinforcing structure extending radially from the bead towards said sidewall, a crown reinforcing structure, each of the beads also comprising an anchoring region for holding the reinforcing structure in place, wherein said tread comprises an inner layer of substantially incompressible rubbery material and an outer layer of rubbery foam wherein: the foam expansion ratio is between 110 and 400%, preferably between 120 and 350% and even more preferably between 135 and 300%; and the thickness of the layer is greater than 2.0 mm and preferably greater than 4 mm.