For the bike ascent from Tirano, you have to face an elevation gain of 1364 m along 17.3 km of paved road, passing through the hamlet of Cologna and gaining altitude on the switchbacks leading up to Alpe Trivigno. Bike ascent time: 2.30 hours.
The descent from Trivigno to Tirano is 12.9 km with an elevation difference of 1500 m. After an initial section of easy gravel road and a very short piece of asphalt, the route takes a right onto a military road which becomes increasingly narrow and turns into a path that crosses the paved road climbed earlier. Follow the asphalt on the left and, after about 300 m, turn right to descend, still on asphalt, until you reach on the left (sign step 2 - 1520 m asl) the mule track that leads to Roccolo Pinchetti. From here, after two hairpin bends on asphalt, turn left onto a gravel road that soon becomes a path and descends to S. Rocco. From the small church, a steep path leads to Marto (sign step 3 - 830 m asl). A long and fun gravel road reaches Stazzona and the bridge over the Adda river, which you cross on the right to follow the 4.4 km cycle path back to Tirano.