From Bergün you leave the Albula valley soon after the start and head uphill through the Val da Stugl, from Runsolas über Alp da Stugl in the narrow valley directly along the stream. About 2.5km after the alp, even strong bikers can no longer ride, as the steep ascent up the north slope to Chrummhüreli requires carrying or pushing. When you reach the top of Mäschenfurgga, it flattens out again until you reach Ducanfurgga.
Now single trails follow for all desires, combined with views into the Sertig valley, down to Davos, into the Landwasser valley and finally into the Albula valley. For the first part of the steep downhill into the Ducan valley, however, it is better not to take your eyes off the front tyre; the first 300 metres or so of ascent are only something for technically very experienced bikers anyway.
Once in Sertig-Dörfli, the seclusion of the tour is over. The part of the tour that follows now has a lot to do with pure enjoyment and less with challenges.