I've searched the forums on this subject, but was wondering if someone's done this tour along the Danube recently, and if so, what are the chances of renting bikes in Passau without booking a tour. We'll be biking with some European friends who have their own bikes and want to find hotels as they go instead of reserving ahead of time. So we could probably book a self-guided tour (hotel and bikes), but would prefer just to rent the bikes in Passau and drop them off in Vienna.
Any input greatly appriciated. Thanks!