The pivot arm swings the tire into a position over {TAIL ~ the wheel} wherein a sector of the tire beads are laterally opposite the radial perimeter surface of {HEAD ~ the wheel} 
The pivot arm swings the tire into a position over { TAIL ~ the wheel } wherein a sector of the tire beads are laterally opposite the radial perimeter surface of { HEAD ~ the wheel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD