1. A DISPLAY AND ADVERTISING DEVICE FOR ASSEMBLY IN THE OPENING OF AN UNMOUNTED VEHICLE TIRE AND FORMED FROM A SINGLE SHEET OF RELATIVELY STIFF BENDABLE MATERIAL COMPRISING, AS A UNITARY STRUCTURE AN INTERMEDIATE DISPLAY PANEL, A TRANSVERSE TOP PORTION EXTENDING FROM A SCORE LINE FORMED AT THE JUNCTURE OF THE PORTION AND THE PANEL, A SUPPORTING MEMBER EXTENDING FROM THE PANEL ALONG THE SCORE LINE FORMING THE JUNCTURE OF THE SUPPORTING PORTION AND THE PANEL, MEANS FORMED ON THE TOP PORTION AND INSERTABLE WITHIN THE TIRE OPENING TO ENGAGE AND OVERLIE THE INNER SURFACES OF THE ADJACENT BEAD AND SIDE WALL OF THE TIRE, AND MEANS FORMED ON THE SUPPORTING PORTION AND INSERTABLE IN THE TIRE OPENING TO ENGAGE THE INNER ADJACENT SURFACES OF THE OPPOSITE BEAD OF THE TIRE AND THE SIDE WALL OF THE TIRE CONTIGUOUS WITH SAID LAST NAMED MEANS, SAID LAST NAMED MEANS ENGAGING THE INNER SURFACE OF SAID DISPLAY PANEL AND EXERTING A FORCE OF COMPRESSION THEREAGAINST TO FLEX THE PANEL OUTWARDLY OF THE TIRE AND THEREBY TO SUSTAIN THE PANEL IN SUPPORTED POSITION ON THE TIRE.