Berbenno di Valtellina-Caldenno road is one of the Most Insane Bike Rides You Don't Want to Miss. Located in the Province of Sondrio in the Italian region Lombardy, the climb is just brutal. The maximum slope is 40%. It’s one of the hardest and most epic climbs you can ride on two wheels.
The road is one of the Toughest Bicycle Climbs in the World. It’s asphalted with some concrete parts near the end, so it should be climbed with a mountainbike. Open to traffic throughout the year, may be closed for short periods in winter when the weather is bad. Some parts are extremely narrow, even for an average car. Totally impassable for 2 cars at the same time.
The road runs south-north connecting the villages of Berbenno di Valtellina (at 389m above the sea level) and Caldenno, at 1.811m asl, via 40 hairpin turns. The ascent is 13.5 km long. Over this distance the elevation gain is 1.422 meters. The average gradient is 10.53%.