ADFC Köln (Allgemeiner Deutscher Fahrrad-Club)

In the page's words:

With more than 240,000 members nationwide, the Allgemeiner Deutscher Fahrrad-Club e.V. (ADFC) is the largest organization representing the interests of cyclists in Germany.
It is politically committed to the consistent promotion of cycling.
It advises on all issues relating to cycling: law, technology, tourism.
It regularly organizes events on the subject of cycling.
It offers interesting tours in and around Cologne.