Achseli

At Büel the road veers right and continues climbing for about 400m until you come to a switchback to the right climbing relatively steeply. Take this right turn and follow the dirt road uphill (approx 700m vertical averaging 16% gradient) until you get to the alp at Achseli. 

At Achseli turn right and keep following the dirt road until it becomes singletrail. Eventually you will come to the junction where a singletrail veers off to the right signposted for Gheist-Sool. Take this trail and ride the switchbacks down until you rejoin a dirt road. (At this point most of the tours turn right and follow the dirt road back down to Schwanden) 

Once you get to the dirt road turn left and ride slighly uphill across the bridge where you will find a trail descending to the right into the woods. Take this trail. (The first two switchbacks are tight and people have started to cut them, please respect the trail and if you can't ride these switchbacks get off rather than cut the corner).  After the switchbacks there is a non-bridged river crossing which requires getting off the bike. The trail then continues completely rideable until it rejoins a dirt road.

Turn right cross a bridge and take the trail that drops into the woods on the left. Follow this trail until it joins another dirt road which you can follow around to Sool and descend once more back to Schwanden.