The bicycling community is focused around a real-world activity – navigating a bicycle – which requires planning within a complex and ever-changing space. While all the knowledge needed to find good routes exists, it is highly distributed. We show, using the results of surveys and interviews, that cyclists need a comprehensive, up-to-date, and personalized information resource.We introduce the personalized geowiki, a new type of wiki which meets these requirements, and we formalize the notion of geowiki. Finally, we state some general prerequisites for wiki contribution and show that they are met by cyclists.