Only for experienced bikers, or wear. from the Rossweidhöcht to the alpine hut going down is easier than going up. From Niderurner Täli to Rossweidhöcht easy way, even with trailer mobile. I would have expected more for an official bike path. The view and the view of Lake Zurich is sensational. Since 15min down slide is quickly forgotten.
I always do the tour from Siebnen - Niederurnen. The descent from the Rossweidhöchi on the old road down to Niederurnen is simply nicer than the reverse tour. The carrying passage is also only 15 - 20min. so well tolerable.