Sella Roisettaz

Overview

Sella Roisettaz is a hors catégorie ascent that earns its top billing through sheer duration. Over 29.9 km the road lifts you from 788 m at the base to 2492 m at the summit, a net gain of 1704 m. The average gradient of 5.69% sounds almost gentle on paper, but that number is stretched across nearly thirty kilometres — the kind of sustained effort that measures itself in patience rather than lung-searing sprints. The total ascent of 1670 m confirms there is barely any respite: this is a climb that goes up, and keeps going up.

How the Gradient Unfolds

The headline for this climb is its length, and understanding the shape matters more than any single ramp. At 5.69% average across 29.9 km, most of the road sits in a rhythm-friendly band, but the 19.72% maximum gradient tells you the story isn't uniform. Expect the mean to hide sharp spikes — pitches that lurch well into double figures before easing back to something you can breathe through. With a net gain of 1704 m and a total ascent of 1670 m, the profile is almost entirely uphill, meaning the punchy sections stack directly on top of accumulated fatigue rather than arriving fresh.

Pacing Notes

On a climb this long, discipline beats bravado. The single biggest mistake is chasing the early kilometres and paying for it across the back half. Anchor your effort to your FTP and aim to sit just below threshold for the sustained stretches, keeping a reserve for the ramps that touch 19.72%. Over 29.9 km, even a small overcook compounds badly, so err on the conservative side for the first third and reassess once you've settled.

If you don't know your threshold, run the numbers through the FTP estimator before you go — pacing 1704 m of climbing on guesswork is how good days turn into survival marches. Break the climb into mental thirds and treat each as its own effort rather than staring at the full 2492 m summit from the bottom.

Gearing

Gear for the length and the spikes, not the average. The 5.69% mean is manageable, but the 19.72% maximum demands a bailout gear you can actually turn while tired at altitude near 2492 m. A compact 34-tooth chainring paired with a wide cassette is the sensible baseline: 34×32 covers the bulk of the sustained gradient and lets you spin rather than grind over 29.9 km. For the steepest ramps — and for the fatigue that builds across 1704 m of gain — a 34×34 gives you the extra margin to keep cadence up instead of forcing the pedals over. Given the sheer duration, most riders will be glad of that lowest gear more than once.

Summary

Sella Roisettaz is a test of endurance and pacing far more than raw power. Nearly thirty kilometres of near-continuous climbing, a summit at 2492 m, and ramps to 19.72% make it a genuine HC challenge — one that rewards riders who respect the distance and gear conservatively.

Length: 29.9 km
Average gradient: 5.69%
Max gradient: 19.72%
Start: 788 m
Summit: 2492 m
Net gain: 1704 m
Total ascent: 1670 m
Category: HC