Passo della Sentinella

Overview

Passo della Sentinella is a category 1 climb that stretches 16.3 km from a start elevation of 1207 m to a summit at 2139 m. Over that distance it averages 5.73%, but the average tells only part of the story: with pitches reaching 12.65%, this is a climb of long, steady effort punctuated by sharp reminders that you are still going up. The net elevation gain is 932 m, while the recorded total ascent is 884 m, a small difference that hints at brief flatter or descending steps woven into the ascent. At more than 16 km, it is a sustained test of patience rather than a short, explosive wall.

How the Gradient Unfolds

The 5.73% average sits comfortably in the range where a fit rider can settle into a rhythm, but the 12.65% maximum means the road does not stay polite for the full 16.3 km. Expect the profile to breathe: stretches near or below the average that let you recover your cadence, then steeper ramps that push toward double digits and force a harder pull. Because net gain (932 m) slightly exceeds total ascent (884 m), the climb likely includes a few kinder sections that briefly relieve the pressure before the grade resumes. The smart approach is to treat the early kilometres as territory to conserve, then keep something in reserve for the steepest ramps higher up, where the thinner air above 2000 m compounds every percent of gradient.

Pacing Notes

On a climb this long, pacing beats bravado. Aim to hold a steady effort just below your threshold on the average-gradient sections, and accept that the ramps toward 12.65% will spike your power well above that line — that is fine, provided you recover on the shallower stretches. Anchor your plan to your FTP: riding the sustained 5.73% portions at a controlled sub-threshold effort should leave enough headroom to absorb the steep pitches without blowing up. If you are not sure what number to build around, run yours through the FTP estimator before you plan the climb. With over 16 km ahead and 932 m to gain, going out too hard in the first third is the classic mistake here.

Gearing

For a 16.3 km effort averaging 5.73% and spiking to 12.65%, err toward easier gearing than you think you need — the steep ramps late in the climb, at altitude, are where an ambitious ratio punishes you. A compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 will get most fit riders over the average sections and up the ramps with an acceptable cadence, but if you value your knees or plan to ride within yourself, a 34×34 gives extra margin for the 12.65% pitches and keeps you spinning rather than grinding across the full 932 m of climbing.

Summary

Passo della Sentinella rewards riders who respect its length. Meter your effort across the 16.3 km, save something for the 12.65% ramps, and gear low enough to keep a rhythm from 1207 m all the way to the 2139 m summit.

Length: 16.3 km
Average gradient: 5.73%
Max gradient: 12.65%
Start: 1207 m
Summit: 2139 m
Net gain: 932 m
Total ascent: 884 m
Category: 1