Groupsets, wheelsets and other specific parts can be found much easier. We invite anyone who sees a problem with any Estimated Value to report it to us by clicking the Report A Problem Appraisal vintage bike at the top of each page it looks like this. The database is updated daily. Anyone can contribute to the WIKI. Displaying local bicycle campaigns in the Bike Citizens app Information on bike events can now be added to the Bike Citizens Appraisal vintage bike.