I’m the sort person that sometimes rides around with my commuting bike in much worse operating condition than I would recommend to anybody I was helping at Bikeworks to maintain their own machine. Maybe once a person has a certain familiarity with bike maintenance they know how to push components just to the edge of failure before replacing them. Or maybe my DNA would be a perfect source for scientists to finally identify the elusive procrastination gene. Either way, I have recently had a close call with a Just Riding Along sort of catastrophic bike failure. As in “Gosh, I don’t know what happened! I was just riding along when for no reason at all my rear wheel disintegrated into a twisted mass of spokes and rim fragments”.
A few weeks ago I had my winter bike in the stand for a little cleaning and lubrication, when I noticed that the rear wheel seemed to have a hairline crack running along a lengthy portion of the rim. If I noticed that with the bike of a patron at Bikeworks I would recommend that they replace the wheel at once, before riding it any further. In fact, I would be quite insistent. Of course, I did no such thing myself. Instead, I rode my bike to and from work over bumpy, rutted, icy winter roads while slowly getting around to building a new wheel (all the while conspicuously not keeping a close eye on how my old wheel was holding up).
When I finally completed and installed the new wheel, I took a close look at the now shudder-worthy failing wheel. There is a very good chance that even one more trip with the old wheel would have resulted in an “exciting” mechanical failure.
So, don’t do that folks – it’s just stupid. Please replace your wheel promptly. Luckily, my story ended happily, with no accident, and a spiffy new rear wheel installed.

Replacement wheel constructed from all used components, built around a nice, older Hope cartridge bearing hub (already getting dirty and earning its keep).