I needed to change the tires on a couple split rims recently. I was able to get one apart & half of the other one, but the last one wouldn’t budge. I saw a post somewhere where someone suggested putting them in the burn barrel & then the next day scrape off the ash & repaint. I think they were joking, but it actually worked. I started a small fire to burn some cardboard boxes & put the wheel with the stick tire on it. Didn’t take long at all for the tire to burn off. It didn’t get hot enough to compromise the steel wheel.