Two sections of trail are closed (once across the pasture and once because of moorland, is usually very wet and breaks down), see the ride map. Bypass on the gravel road.

A short section (after approx. 10.5km) leads through a (new?) bike ban, as it leads through a moorland area. However, it is relatively easy to avoid by simply following the SwitzerlandMobility MTB route (gravel road) and later turning right onto the trail again.

Very nice tour, but the sections in the forest are wet for a long time (swamp).
The way back can be extended via Klosters with further Elevation losses ;)

The descent from Weissfluhjoch to Grünsee is one of my favorite trails. Beautiful views, technical trails, to geniessen☀️

Rode the tour today, 8 July (again). Leased the car in Küblis in the morning, took the train to Davos. Did a few laps there and finished with the Duranna Run back to Küblis.
Trail condition is great. Trail free of snow and great up to Grünsee. There are a few fences at, or after, Obersäss because of the cows. The often boggy sections after Untersäss are limited. I think the descent offers a lot, from gravel to hairpin bends, forest floor and of course a great panorama. Always a pleasure and certainly not the last time.

I rode the tour yesterday in the very best conditions. However, I pedaled uphill from Langwies via Sapün - Heimeli - Strelapass. Despite the steep gradient from Heimeli and the carrying passage up to the Strelapass, it was more fun than hard work because of the beautiful scenery.

The first part of the descent is - as in all leveled ski areas - absolutely bland and uneventful. From the Casanna Pass down to the Grünsee is the highlight, a super trail. After the Grünsee lake, the trail is very varied; navigation with a GPX track is recommended, as not all trail entrances are easily recognizable. It should be mentioned that the trail here leads through large wetlands and you get stuck in the mud a few times, although it is relatively easy to ride. It's better to clean your bike afterwards. In addition, this part of the descent is almost completely in the shade on fall afternoons.

A really great tour, together with the great uphill a top tour. I'd love to do it again :)

Trail ridden on Aug 3, 22
Entrance trail at Alp Obersäss apparently no longer exists. From Birchenbüelen it's a muddy mess. I'm surprised, with such a long dry phase as we've had in the last 3 weeks. It was borderline with this mud. Otherwise some nice sections with technical and flowy passages. Does it never dry out up there? If it were dry, it would certainly be a top descent.

Wonderful route - peppered with everything that a tour with so many meters of altitude has to offer. Sometimes cool, sometimes flowy, sometimes muddy (that's also part of MTB! ), sometimes b(l)ocky :-) - Fantastic panorama! - Way back via Gotschnagrat and down to Davos: https://youtu.be/yYrj9V927lY

I rode the trail on 10.9. and now the trail is mostly dry and therefore very fun - 1,900 Elevation loss in one go, where else can you find that? Highly recommended. There is an acute mushroom alert in the woods :-).

Two days ago I did a Parsenn - Küblis tour, but a little differently to the Duranna Run presented here. I started in Davos Wolfgang, on the partly steep gravel road to the Parsennhütte. Then the panoramic trail to the Parsennbahn, with which I rode up to the Weissfluhjoch. Then down on the Schifer descent, but then I missed the path to Küblis and came down in Serneus and rode along the stream to Küblis. I really liked the area, both on the Davos side and the Prättigau side. I made a video of the tour for indoor cycling and as a travelogue, now on YouTube. https://youtu.be/M70l2T-D5aQ

One of the best trails around Davos! Very varied from high alpine to forest trails, everything is available!
In the video link you can see the trail from 8 min. 40 sec.
Have fun.....
https://youtu.be/m2QUSpSAqA8

I rode the trail today. Lots of flowy sections; the old path to the Fideriser Duranna can be bypassed via an alpine road if you're a technical biker. The section before and after the Moosboden was quite muddy despite the dry weather - so certainly difficult after rainy weather.
There were a few hikers and bikers in the upper part; we didn't meet anyone in the lower part.
GPS was very helpful.
It was fun!

The trail is currently extremely muddy and wet. Therefore extra technical. I think it's rideable in the dry. However, it is a big swamp due to the rainfall of the last few days. Very beautiful landscapes at different altitudes.

Highly recommended. Varied landscape for the eye with correspondingly different surfaces and 90% of the time on single trails. The gradient is pleasant and therefore the tour can also be mastered by less technically experienced cyclists with only a few descents. The tour is probably not ridden/hiked that often, especially in the second part after the Duranna Plain, so the paths are sometimes a bit overgrown and you like to ride past one or the other turnoff. GPS is recommended so that you don't miss any singletrails.

What is not so nice, but a necessary evil: the fun is repeatedly interrupted by cattle fences (estimated about a dozen times).

I will definitely do this descent again more often

Still a bit wet at the moment but easy to ride. There are still a few larger snow fields up to Kreuzweg.