first wound upon the drum 10 thereafter the steel reinforced monoply 56 is wound upon the liner 48 the liner 48 and the monoply 56 together forming a cylinder enveloping the drum 10 additional strips of rubber material such as the chafer strips 60 and rubber cushions 62 are then wound upon each of the opposite end portions of the steel reinforced monoply in near radial alignment with each of the recesses 42 of the flanges 40 the carcass of the monoply and its associated liner and strips is then in a condition for receiving a pair of carcass bead defining annular metallic cores such as the core 48 one such core surrounding and radially aligned with each of the recesses 42 of the flanges 40 it will be understood that the inner diameter of each of the annular metallic cores 48 is slightly greater than the outer diameter presented by the circumferential array of segments 24 when the latter are in their most fully contracted condition as illustrated in the lower portion of fig1 and 2 it will also be understood that the annular metallic cores 48 are each provided with or have secured thereto a triangular like annular apex strip such as that denoted by the reference character 64 in fig3 the bladder 34 is then expanded to a condition as illustrated in the upper portion of fig1 by introducing pressurized fluid through the hose 36 into the bladder 34 as the bladder 34 is expanded.