PURPOSE: To drop quickly simply a bead for quick exchange of a tire by fixing a cylinder fixing a bead dropping member to a mount capable of being fixed at a predetermined height relative to a strut fixed to a tire mounting bed. ;CONSTITUTION: Struts 16 are fixed onto a bed 10 for mounting a tubeless tire 14 having a bead 14a fixed to a rim of a one-piece wheel 12. An air cylinder 26 is fixed to the upper central part of a mount 20 which is guided on the struts 16 by guide members 22 to move vertically and can be fixed at a predetermined height. An actuator of the air cylinder 26 is provided with a bead depressing member 28 for depressing the bead 14a of a tire 14. Thus, during a race of racing carts, the bead of the tubeless tire 14 can be rapidly dropped even with a simple structure to change simply the tire.;COPYRIGHT: (C)1996,JPO
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