Behold the catastrophic failure of a hub:
About half of the flange on one side just broke completely off. Fortunately, it was right at a switchback, so low speed prevented a serious pile-up. Not so lucky was the resulting ~3 mile walk out of Guaje Canyon. I loosened the spokes as much as possible with the hopes of getting the wheel straight enough to turn inside the fork, but the best I could get was a really annoying rubbing sound every time the wheel came around. With the tire deflated, some persistent pedaling - even downhill, and a high tolerance for a nature-destroying racket for every tire rotation, some riding was possible. Most of the way, however, was on foot. At least it was a nice day.