Passo delle Guadine

Overview

Passo delle Guadine is one of those rare climbs where the numbers alone tell you almost everything you need to know. Over 15.1 km the road lifts from a valley floor at 130 m all the way to 1675 m, a net elevation gain of 1545 m. The average gradient is a relentless 10.2%, and it is that average — not any single ramp — that defines the effort. Rated HC, hors catégorie, this is the top tier of the difficulty scale, sitting above categories 1 through 4. There is no gentle warm-up and no coasting reward; the climb simply demands sustained power for the better part of an hour.

How the Gradient Unfolds

A 10.2% average over 15.1 km is punishing precisely because it leaves so little room to recover. On a climb that averages 5 or 6%, steep pitches are offset by flatter stretches where you can spin and breathe. Here, the mean is already double-digit, so even the "easy" sections are hard, and the hard sections are brutal. Expect the gradient to hover around 10% for long, uninterrupted stretches, occasionally easing and occasionally kicking upward. Because the total ascent of 1493 m is slightly less than the 1545 m net gain, the profile is almost monotonically upward — there are no meaningful descents to break the rhythm. You climb, and you keep climbing, from the first pedal stroke to the summit.

Pacing Notes

On a climb this long and this steep, pacing is the difference between finishing strong and blowing up halfway. Anchor your effort to your FTP: on an HC ascent of roughly an hour, most riders should sit just below threshold, saving a small buffer for the steepest ramps rather than burning matches early. If you do not know your threshold, run the numbers through the FTP estimator before you go — guessing on a 10.2% wall is expensive. Start conservatively in the lower slopes; with 1545 m of vertical still to gain, ego in the first kilometre is punished harshly in the last. Keep your cadence high and steady, and let the gradient, not your emotions, set the tempo.

Gearing

Do not under-gear this one. With a 10.2% average sustained for 15.1 km, a compact 34-tooth front paired with a wide cassette is the sensible floor for strong climbers. A 34×32 is workable if you have the legs and the fitness to hold a solid cadence at threshold, but many riders — especially those tackling the full 1545 m of gain on tired legs — will be far happier with a 34×34. The extra range lets you keep spinning rather than grinding, which protects both your knees and your pacing on the steepest pitches. When in doubt on an HC climb, choose the easier gear.

Summary

Passo delle Guadine is a pure HC test: long, steep, and unforgiving from bottom to top. Respect the 10.2% average, gear generously, pace off your threshold, and the summit at 1675 m will feel earned.

Length: 15.1 km
Average gradient: 10.2%
Max gradient: n/a
Start: 130 m
Summit: 1675 m
Net gain: 1545 m
Total ascent: 1493 m
Category: HC