Consider your bicycle's handlebar stem cap for a moment. It's right there in front of you as you ride, yet it tells you nothing. Colorado mountain bikers Graeson Lewis and Mike Hogan obviously thought that just wasn't good enough, and decided to put the humble stem cap to work. The result is their product, the StemCAPtain, which replaces a conventional cap with one that incorporates a waterproof analog clock, thermometer or compass.
Read the full article: StemCAPtain - not a bike lock, but a bike CLOCK