Abstract: A vehicle wheel hub cap having a stylized disk with a pair of spaced openings therein adjacent the outer periphery. An outstanding collar on the disk supports thereon an inflatable tube. A flared retainer rim on the outstanding collar holds the inflatable tube in its assigned position on the collar. An outwardly disposed valve stem on the inflatable tube is aligned with one of the spaced openings in the disk. A removable plug in the opening aligned with the valve stem is adapted to enter into a locking engagement with the disk. The inflatable tube when pressurized expands so as to holdably engage the rim of a conventional vehicle wheel. The hub cap is thus secured against accidental loss or theft, and can be removed only after the inflatable tube has been depressurized.