A wheel and tire assembly which includes inner and outer tubeless tires mounted on the wheel. The two tires together define inner and outer air chambers which are pressurized through separate air valves. The outer tire includes a plurality of radially spaced projections on its inner surface which define passageway between the inner and outer tires at their respective beads to allow the filling of the outer chamber. The inner tire may include a bevelled end portion at its bead to further facilitate filling of the outer chamber.