If you ever want to make replacing a wheelchair tire easier then this is the tool for you. Look at almost any wheelchair sports technician tool bag and you will find a Kool Stop Tire Bead Jack. As an added bonus this tool will help you not pinch your inner tube while putting a tire back on.
From Kool Stop:
The Kool Stop Tire Bead Jack is an articulated tool, with a comfortable grip, for installing really tight tires. The articulated end uses the rigid piece against the rim edge as a fulcrum while the hinged end lifts the bead up and over the opposite edge of the rim. This is a great tool for dealing with difficult tires.
Kool Stop Part Number: KS-TJ