I am looking at some Kryptonite U-Locks with double deadbolts. However, I am also looking at a six-foot chain. I was imagining... just imagining... the possibility of running a heavy-duty chain from the front wheel, through the small amount of frame opening, real wheel, seat hoop, and locking it all like that around whatever the fixture may be. It's not common but is it that crazy of an idea? There are a hundred ways to skin this cat. What do you do with your bike?