Pelletsmühl to Dietramszell Forest Route

Absolutely not recommended with the road bike. Minimum 30mm tires, better more, and the wheel should not be made of carbon either.
@ Willy Sommer: The problem is not that you have described it wrong, but unfortunately Komoot adds, if you plan a road bike tour, your highlight then automatically in the assumption the track is roadworthy. But that is only conditionally. And every time you plan a tour, all the highlights the Komoot automatically adds to any warnings work through seems unrealistic

Komoot simply does not have the rubric "Quer" or "CycloCross" or "Gravel".
With the MTB, the track would be too boring for me, with a (expensive) road bike borderline.
With the cross-wheel (32er tire) but perfect and quite demanding, since it goes up a few meters.

A little tip to all who complain here that it is not a RR highlight:
When planning the tour, Komoot always shows the route condition on the bottom left. If there appears "loose surface" it is always advisable to take a closer look at the map ...

Absolutely no traffic, with a crisp climb and shady path through the forest. But soon after Pelletsmühl the asphalt turns into a rough forest road that moves a bit until you arrive in Dietramszell. With RR good mobile if you just keep a watchful eye on stones and other chunks. @Seibi: Who can read is clearly an advantage. A forest path is just more for Paris-Roubaix trailer and less for filigree minds ;-)