Tyre intended to be mounted on a mounting rim of a vehicle wheel and having a predetermined direction of mounting on the vehicle, comprising a tread extending between an outboard axial edge and an inboard axial edge, the inboard axial edge being the edge intended to be mounted on the side facing the body shell of the vehicle when the tyre is mounted on the vehicle in the said predetermined direction of mounting, the distance between the outboard axial edge and the inboard axial edge of the tread in the new state defining a width L of the tread; in which the tread comprises N circumferential ribs, N being a whole number greater than or equal to 4, separated by N-1 circumferential grooves each one comprising two lateral walls (4210, 4211; 4220, 4221), the mean axial distance between the two lateral walls of each groove being greater than or equal to 5 mm and less than or equal to 20 mm; in which the circumferential rib adjacent to the outboard axial edge of the tread extends, in any radial section and over the entire radial depth of the tread, from a first axial position, of which the axial distance with respect to the inboard axial edge of the tread is greater than or equal to 0.95·L, to a second axial position, of which the axial distance with respect to the inboard axial edge of the tread is less than or equal to 0.6·L; in which the circumferential rib adjacent to the outboard axial edge of the tread comprises a first portion made from a first rubber composition and a second portion axially adjacent to the first portion and made from a second rubber composition different from the said first rubber composition; characterized in that the first portion extends, in any radial section and over the entire radial depth of the tread, from the said first axial position to a third axial position of which the axial distance with respect to the inboard axial edge of the tread is less than or equal to 0.85·L, the second portion of the circumferential rib extending from the said third axial position to the said second axial position; in which the said first and second rubber compositions comprise at least one elastomer and at least one reinforcing filler comprising a carbon black, the carbon black representing a percentage greater than or equal to 50% and less than or equal to 100% of the weight of all of the reinforcing filler, and in which the said first rubber composition has: an elastic modulus at 300% deformation which is greater than 1.1 times and less than or equal to 2.1 times the elastic modulus at 300% deformation of the said second rubber composition; a Shore A hardness which is greater than or equal to 0.95 times and less than or equal to 1.20 times the Shore A hardness of the said second rubber composition; a complex modulus G* at 60°C which is greater than or equal to 1.00 times and less than or equal to 2.10 times the complex modulus G* at 60°C of the said second rubber composition. an elastic modulus at 300% deformation which is greater than 1.1 times and less than or equal to 2.1 times the elastic modulus at 300% deformation of the said second rubber composition; a Shore A hardness which is greater than or equal to 0.95 times and less than or equal to 1.20 times the Shore A hardness of the said second rubber composition; a complex modulus G* at 60°C which is greater than or equal to 1.00 times and less than or equal to 2.10 times the complex modulus G* at 60°C of the said second rubber composition.