Til og fra Heistoppen Sarpsborg, Viken, Norway 0.8km|2m ◢ ◣ 39m|08.06.2020 Open in the Trailguide Web App Description From the lift top in Kjerringåsen bike park if you fancy a trail ride in Trøsken. Begins with a small upward bend, before it slowly descends. Mostly on loose rocks with good flow, a few half-decent knocks. Can be driven both ways.