A pure pleasure for trained mountain bikers
Follow the cycle path from Luttach to Prettau. There, turn left and follow path n. 16A upwards. As soon as you reach the gravel road n. 15B, keep on following it until you finally arrive at the mountain hut Tauernalm (2020m). Follow the bumpy track to turn back to the valley (it might be better to carry the bike at certain places). Eventually, follow the gravel road that leads you out of the valley.
The tour can be undertaken also by e-bike.