A method of manufacturing tubular tires for bicycles and motorcycles, includes the steps of:laying bead steel wires longitudinally on a first or inner sheet of a tire casing and adjacent the edges thereof;folding the longitudinal marginal portions of the first or inner sheet of the casing around the bead wires in order to cover the wires completely;laying a second or intermediate sheet on top of the first or inner sheet, the longitudinal edges of the second sheet projecting well beyond the in-turned longitudinal edges of the first sheet;laying a casing tread on the thus superposed sheets;shaping the tire assembly thus obtained by imparting a horseshoe configuration thereto, as seen in cross-section;introducing an uncured inner air tube into the casing;closing the tire by assembling by welding the side edges of the second or intermediate sheet projecting from the casing; andvulcanizing the assembly.