The subject innovation is as in to allow the filled air in the tire can be improved to practical use convenience by making it possible to supply compressed air to the case is out of the optimum pressure, simply tires using the equipment installed on the vehicle, the structure is installed to be functional with the car body an auxiliary air tank for storing compressed air as installed, and a compressor and supply compressed air to the auxiliary air tank is provided, and installation of the shaft to receive transmitting power, since prior to the shaft, and as coupled to that pinion sleeve gear coupled around the pinion and the pinion sleeve to the ring gear, while operating since the shift lever to cause the pinion-ring gear and the gear coupling or disconnecting, the magnetic field generated from the coil to the shift lever while action before and after consisting of a plunger to provide a force by character The borrower has to provide a versatile auxiliary air tank.
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