The middle link in a chain of three road climbs in the Pyrenees (the others being Col de Peyresourde and Col du Tourmalet), Col d’Aspin connects Sainte-Marie-de-Campan, in the upper Adour valley, with the commune of Arreau, on the River Neste. Zwift’s Climb Portal segment mirrors the more difficult ascent from Arreau.

This popular climb features regularly in the Tour de France, and has been raced well over 70 times since its introduction in 1910.

Here’s an IRL segment that covers most of Zwift’s climb: