Starting from the center of Premana, the adventure begins with a climb by mountain bike to the highlands, in the direction of Bocchetta di Stavello. Moving toward the eastern edge of the town, where at the hairpin bend between Via Prealpi and Via Risorgimento, the Val Fraina mule track begins. The route, at first paved and with limited gradient, turns to dirt with large cemented sections and rapidly increasing elevation gain, mostly rideable despite the gradual increase in difficulty. During these first 6/7 kilometers, the route crosses Alpe Rasga, passes downstream of Alpe Caprecolo and reaches Alpe Fraina at 1393 meters above sea level. From Alpe Fraina, continue about 200 meters eastward following the military mule track, which forks creating two distinct routes to the high altitude fortified areas of Bocchetta di Colombana (southbound) and Bocchetta di Stavello (northbound). Continue northward crossing the stream and then begin the most challenging and scenic section of the route following the Great War dirt mule track with its 5 km, 800 meters of elevation gain and 41 hairpin bends to reach the pass at an altitude of 2202 meters. In some passages given the difficulties of the place and the exposed sections, it will be necessary to push the bicycle, but nevertheless the route given the regular gradient of the track (with an average of 16%) and the width of the mule track, is cyclable. However, this part is suitable for experienced mountain bikers and allows you to reach at high altitude a historic pass connecting the provinces of Lecco and Sondrio. Finally reaching Bocchetta di Stavello, it is possible to observe and visit the military testimonies of the Northern Frontier (Cadorna Line), positioned along the ridge that reaches the summit of Monte Rotondo. The return is planned along the same route of ascent to be traveled with care and considerable technical skills given the high difficulty of the route in the downhill direction.