The climb is ranked number in Italy and number in the world.
Starting from Caramanico Terme,
the Passo San Leonardo ascent is 15.865 km long. Over this distance, you climb 689 heightmeters.
The average percentage thus is 4.34 %.
Since 2005, the Passo San Leonardo will be/was climbed in the following big tour stages:
Giro d'Italia 2020 : San Salvo - Roccaraso on 11/10/2020