Recommendation from Kristian Brakestad, Skåbu:
Starting from Gamle Munchesæterveg from (New) Mugsætervegen west of Heidalsmuen, you cycle up on a pretty nice road/path. After a while, it becomes somewhat more rocky and damp, but you cycle all the way with good technique and condition. From the north end of Heidalsmuen there is a very nice slope to Bærdøla, which has been washed over. Then it goes well to Nerdalsfiskeløysa which is easy to pass on wheels. After about 2-300 meters, it takes a path to the right towards Geitfjellet. Follow this and finish on the paths towards Kviknegråhø. It can be a bit difficult to find the right path due to many intersections, but keep the altitude until you find a path that goes between Kvikengråhø and Kringlefjellet. (If you leave early, you will come to a path at the bottom of Kringlefjellet that stops in heather and berries). Follow the path between the mountains and enjoy the hike towards Heidalsmuen down to the stream that turns into Sandåa (the path is somewhat unclear when you reach the stream, but you can see it on the other side). From there there is a nice mountain path down to Mugsætervegen again.
Access:
Either by car/bike from Mugsetervegen (barge from Skåbu and Meringdalen) or by bike from Bukkebu in Tverrbygda.
Detailed information can be found on Trailguide.