Actually, if I wanted to lock up my bikes in my garage, I would do exactly what he did. Buy some cable, put some loops on it, and I could lock all my bikes up. That would deter casual theft when the door is left open. Of course, it's a different story out in the real world. If you want to get real crazy, go to a 4WD supply store, and get some winch cable. If it can handle a 20k pound load, it should be ok for your bike.