Abstract: A novel non-collapsible tire building drum is provided herein. The drum is a cylindrical tire building drum consisting of: non-inflatable, non-collapsible, rigid, non-reactive, vulcanization-resistant, unreinforced, synthetic thermoplastic material shell, the shell being of the same diameter between its two axial ends and also providing a smooth surface between its two axial ends, the shell having a particular specified uniform cylindrical shape, and a central, axially-longitudinally-extending core of a non-circular cross-section. The core is specially adapted for mounting the cylindrical tire building drum on a rotatable, axially-longitudinally-extending shaft of a conventional tire building machine.