If you really want to save both the tire and the foam then boiling may not be the answer since it doesn't get the bond hot enough to break free easily. You will end up ripping one or more of the tires also boiling will just about ruin the foams. Acetone will ruin both the tire and the foam not to mention that acetone is easliy absorbed through your skin and is carcenogenic.
The only sure fire way I know of and have used repeatedly with excellent results is to bake them off. Set an old toaster oven (or if the old lady doesn't mind, the regular oven) to 300F or 325F and bake for about 10 to 15 minutes. Let the wheels cool and peel the tires off. The glue becomes brittle and will flake off. (Boiling sort of does the same thing but the temperature is too low, only 212F). Only drawback, the stink which is why I recommend an old toaster oven outdoors.
Now you can reuse the tires, foams and wheels.