Roll out of Cadolzburg and follow the Zenn, then the Main-Donau-Kanal, before the Bibert takes over. The Weiherkette bei Oberreichenbach nature reserve and Burg Cadolzburg castle round things off before you're back where you started. It's 71.9 km with 586 m of climbing, almost all on paved surface. A loop that keeps unfolding, right to the castle at the end.