Very good asphalt and longer straight sections where you can pick up speed. Of course, only if there aren't too many pedestrians on the way. You have to be considerate. But all in all a wonderful route.
Nice bike path with good surface. At least between Ilbenstadt and Gronau. Yes, the path is also used by walkers etc. 😊 therefore it can be a bit crowded and narrow at certain times. Be considerate 😉 otherwise you can make good speed here