The starting point is from the fourth road inspector's house of Passo dello Stelvio 2488 m, then you enter the Swiss territory and take the trail after the pass which climbs just after the refreshment point sign with indication Piz Umbrail. You cannot cycle on the first part of the trail because of the ground. Further on it gets better up to the end of the meadow and at the beginning of the gravel cliff. From here on you have to carry your bike with your hands at first and then on your shoulders: with the help of the fixed rope you have to cross some passageways covered with stones. After taking the usual photos at the top of Piz Umbrail 3033 m, the downhill ride begins in the saddle of your MTB. On the first part of the route a succession of steep switchbacks with a lot of moved rocks makes the descent a bit difficult. Then the ground becomes solid and the trail more regular and flowing up to the shores of the Lago di Rims 2396 m, where the route becomes a grassy path. Then you turn right and ride on many hairpin turns until you meet the road of Val Vau at 1940 meters coming from Santa Maria in Val Mustair Canton Grisons. The climb up to the 2200 meters of the Alp Clastra is waiting for you until you start riding slowly downhill into Val Mora and reach the lakes of Cancano in San Giacomo di Fraele 1952 m see itinerary n. 26