substantially non deformable u201d in contrast with elastic and deformable tire building techniques a material suitable in the formation of the rigid core 48 is steel but other suitably rigid materials may be used as desired additionally while common rigid core build techniques such as those set forth in u s pat no 4 895 692 utilize a plurality of sliding segments in order to close the mold the invention is not limited thereto the invention may be used in other types of rigid cores that close in differing ways or comprise a unitary non segmented structure if desired a segmented rigid core mold 50 is shown in fig4 by way of example it being understood that the invention need not be limited to the mold configuration shown the mold 50 includes segments 52 that come into concordance with the side parts 54 via contact surfaces 56 57 each segment also has transverse contact surfaces not shown which in closed position adjoin the transverse faces of the adjacent segments the radially inner faces 58 of the core 48 come in closed position into contact with the corresponding faces 60 arranged in the extension 62 of each side part 54 beyond a zone 64 assuring the molding of the radially inner surface of the beads of the tire a cavity 65 is defined between the core 48 and mold segments 52 54 defined along inward toroidal surfaces to create the structure of the tire to be molded pursuant.