The "cycle path" between Dumsevitz and Altkamp also consists of sandy subsoil. This is nothing for Rollyhandbike riders, or when accompanied by people who can help in an emergency. I will avoid this route. Nothing for weak nerves.
Yes, that's right ... but that's not just on this section, but on several kilometers over and over again. Road tires will be critical, everything else will go. No reason to reschedule the tour.