Registering bicycles to make them easier to track down if lost or stolen isn’t new. Many bike retailers put identification numbers on bike frames, and in some cities you can register bicycles with the police. The problem is that these methods are generally only effective at the local level. Enter German startup MyBikeNumber. Launched in December 2009, MyBikeNumber is a free online service that lets consumers register their bicycle and components, or search for them worldwide.