Quite demanding single trail in quasi "direct fall line" from the way 4 (Rosswagen - Oberinn - Wangen) to the center of Oberinn. Between 15 and 25% incline or incline!
At the beginning probably to classify as S1, the difficulty level increases in sections until S3. You should master yourself and your bike to survive this piece without any bruises (or embarrassment ...). At three points, due to narrow grazing gates forced to descend and the wheel to be lifted over it.
On our tour, we have bypassed the 4A part because of driving limitations on the tar road.