Colle Sestriere

Overview

Colle Sestriere is a long, high-altitude category 1 ascent that stretches 19.3 km and averages a deceptively gentle 4.85%. Do not let that number lull you: the climb begins at 1098 m and tops out at 2035 m, so you are working in thin mountain air across a net gain of 937 m. The total ascent measures 918 m, meaning the road is very nearly a continuous drag upward with almost no recovery descent to break the rhythm. That combination — genuine length, real altitude, and a steady rather than savage slope — makes Sestriere a climb of patience rather than pure explosiveness.

How the Gradient Unfolds

The headline average of 4.85% describes the whole 19.3 km, but the profile is not uniform. With a maximum pitch of 10.55%, there are ramps more than twice as steep as the average, and those steeper sections are what quietly drain your legs on a climb this long. Between them sit shallower stretches nearer or below the mean, where the road eases enough to spin and gather yourself. The near-identical figures for net gain (937 m) and total ascent (918 m) confirm there is minimal false flat or downhill relief — you climb, then you climb some more. Read the slope constantly and treat every ramp toward that 10.55% ceiling as a moment to protect your effort rather than attack.

Pacing Notes

On a 19.3 km effort, discipline beats bravado. Anchor your pacing to your FTP and aim to hold a steady, sustainable power that you can carry all the way to 2035 m. The steady 4.85% average is ideal for settling into a rhythm, but the pitches toward 10.55% will tempt you to surge — resist, and let your cadence absorb them instead. Remember that at this altitude your sustainable output sits below your sea-level ceiling, so leave a margin. If you are unsure what number to target, run your figures through the FTP estimator before you start, then ride the first few kilometres slightly conservatively; you can always add pressure over the final third once you know the summit is within reach.

Gearing

Length and altitude are the arguments for generous gearing here. Even with a moderate 4.85% average, holding steady power for 19.3 km rewards a low bailout ratio, and the 10.55% ramps make a wide cassette worthwhile. A compact 34-tooth chainring paired with a 34×32 will suit strong climbers who can turn a bigger gear at altitude. If you would rather spin and preserve your legs for the full 937 m of climbing, size up to a 34×34 — the extra range keeps your cadence high on the steepest pitches and takes the sting out of the relentless upper slopes.

Summary

Colle Sestriere is a test of steady climbing: long, high, and unrelenting rather than brutally steep. Pace it by your FTP, gear generously, and respect the altitude, and its 2035 m summit is a deeply satisfying reward.

Length: 19.3 km
Average gradient: 4.85%
Max gradient: 10.55%
Start: 1098 m
Summit: 2035 m
Net gain: 937 m
Total ascent: 918 m
Category: 1