Passo Dasdana

Overview

Passo Dasdana is a full hors catégorie test, and the numbers make no attempt to soften it. Over 25 km the road climbs from 221 m to a summit at 2135 m, delivering 1914 m of net gain and 1907 m of total ascent — figures that sit almost on top of each other, which tells you this is a road that goes up and keeps going up rather than rolling or descending along the way. The average gradient of 7.67% would already qualify as hard on a climb half this length; stretched across 25 km, it becomes a genuine endurance event. This is a climb you finish, not one you attack.

How the Gradient Unfolds

The story here is duration, not spikes. With a 7.67% average sustained over the full 25 km, there is very little respite built into the road — the near-identical net gain (1914 m) and total ascent (1907 m) confirm you almost never give back altitude. The maximum pitch of 18.47% is more than double the average, so expect ramps that briefly force you well out of rhythm before the road settles back toward its steady grind. Because the summit stands at 2135 m, the final kilometres also carry the thinner air of altitude, which quietly steepens the effort even where the gradient itself holds constant. Treat every number on the profile as a floor, not a ceiling.

Pacing Notes

On a climb this long, pacing is everything. Aim to ride the bulk of the 25 km just below your threshold, holding steady power rather than chasing the changing gradient. Anchor your effort to your FTP: riding the sustained sections a touch under it preserves the headroom you will need on the 18.47% ramps, where power spikes are unavoidable. If you do not know your number, estimate it first with the FTP estimator and set a target you can defend for well over an hour. Fuel and drink early and often — with 1914 m of vertical to absorb, the summit at 2135 m arrives long after most riders wish it would.

Gearing

Gear for the long haul, not the average. A compact 34-tooth inner chainring is the sensible foundation for an HC climb of this length. Pair it with a wide cassette: a 34×32 gives most trained riders enough range to spin the 7.67% stretches without grinding, while a 34×34 buys crucial extra relief for the 18.47% pitches and for the final kilometres near 2135 m where fatigue and altitude compound. If you are unsure, err toward the easier 34×34 — over 25 km, a lower gear you rarely need beats a high gear that empties your legs.

Summary

Passo Dasdana asks for patience, discipline, and honest gearing. Ride within yourself, respect the length, and let the steady 7.67% do its slow work rather than fighting it. Do that, and 2135 m becomes a summit you earn rather than one that breaks you.

Length: 25 km
Average gradient: 7.67%
Max gradient: 18.47%
Start: 221 m
Summit: 2135 m
Net gain: 1914 m
Total ascent: 1907 m
Category: HC