two simultaneous movements is a continuous and smooth curved path dash line u201c c u201d of the bead ring and the rim of the segment with respect to one another this path of movement is important in the bending and stretching of the carcass in that this resultant curved path has been found to avoid wrinkles uneven stretching severe bends and or like deleterious movements of the carcass as it is expanded and the opposite ends thereof are formed into the sidewalls of the tire this feature is of particular importance in the fabrication of u201c radial u201d or u201c biased u201d tire carcasses as referred to hereinabove and as may be seen in fig2 when the segment carriers are disposed in their most radially outward limit of movement away from the drum axis the roller cams 144 150 are u201c locked u201d in their respective concavities once this locking has been accomplished release of the forces urging the bead locks radially outward of the drum and consequential release of the bead rings accompanied by axially outwardly movement of the second subsystem has no effect on the positions of the carrier segments rather the carrier segments remain locked in their radially outward status thereby.