Abstract: A tire mounting tool, used with a tire mounting/dismounting machine, includes a mounting arm configured at one end to be firmly received into a tool receiving portion of the machine. A roller member is mounted for rotation in the vicinity of the other end of the mounting arm, wherein the mounting arm is configured such that the roller member rotates in operation about an axis which is at right angles to the axis of the wheel on which the tire is to be mounted by the machine. The mounting arm is further configured and arranged such that when received into the machine, the roller member extends slightly between the rim edges of the wheel and slightly outboard radially of the cuter, i.e. proximal, rim edge.