Ok.... Here a sure fire way dave....

I do this more than i like to admit......

Preheat the oven at 350 for 10 mins.... Put the tires in and turn the temp down to 250... I set the timer for 20 mins and when they come out they pop off no problem... Its alittle smelly but its warm out today crack a window and you'll hardly notice... And i know mikey is going to chime in and say that this method creates Cyanide gas, but i searched the net for hours and never did i find anywhere that stated enough could be prouced to harm even a small child...

WHATEVER YOU DO, DO NOT try the acetone method i read(on the panther thread on sgrid) where you submere the tire in acetone and the glue melts away and the world is a happy smell free place.BULLSNOT! it ruined my boa C's Rubber is so hard now.