This is a gravel forest road that runs deep into the forest covering the pre-Alps near Lofer. It climbs steadily, initially at an easy grade along the Unkenbach stream. The valley is narrow at times and there are some interesting wind-formed rock formations. (When I rode this there was a sign at the beginning that said to ride at your own risk because the wind made the cliffs prone to rockfalls, although it never seemed dangerous).
At the 7 km (4.3-mi) mark, you'll reach an intersection called Schwarzbergklamm (Black Mountain Ravine). This marks the end of the easy climbing. Just after this intersection, an unmarked sharp left turn takes you on a short path down to a hut with water if you need it.
At Schwarzbergklamm, take the right fork (don't cross the bridge) and begin a stout (15% grade) climb for 1 km (0.6 mi). At this point, you leave the Unkenbach stream behind and after a short descent, the climbing begins again.
Finally at 12 km (7.4 mi), you'll reach a clearing with a 4-way intersection called Tanzanger. This is the end of the climbing along this route. Continuing straight takes you to Winkelmoosalm just across the border in Germany. How can you not go to a place called Winkelmoosalm?
The border is pretty clear as the forest abruptly becomes a clearing and there is a sign "Achtung Staatsgrenze" (Attention - State Border). Winkelmoosalm is the base of a little ski resort, and there are several cozy hotels and restaurants.