Thanks for the advice, everyone. It was my first gluing on new rims, so I followed the 3-layer, 3-day procedure on Park Tool.com. I'm glad to see that it was done right, or even a little overdone. It is hard to tell the first time. I'm going to go to work on it this evening with tire levers if I need it, I'm sure I'll get it off. In this case, the tire is still almost new, but the rim is trashed, so I won't worry about hurting the rim.