Bocchetta di Sommavalle

Overview

Bocchetta di Sommavalle is a genuine hors catégorie effort, and the numbers make no apology for it. Over 17.4 km the road climbs from 290 m to 1791 m, an average gradient of 8.61% that almost never relents. The net elevation gain is 1501 m, while the measured total ascent of 1456 m tells you there is barely any respite folded into the profile — what goes up here mostly stays up. With a maximum pitch of 23.95%, this is a climb that rewards patience and punishes anyone who treats the early kilometres as a warm-up.

How the Gradient Unfolds

An 8.61% average across 17.4 km is brutal precisely because it is so consistent. There is no long false flat to recover on: the gap between the 1501 m net gain and the 1456 m total ascent is only 45 m, meaning descents and flat sections are almost nonexistent. Expect the gradient to hover around and above its average for long, unbroken stretches, then spike toward that 23.95% maximum on the steepest ramps. Those pitches are where the climb decides your day. Because the summit sits at 1791 m, the final kilometres also carry you into thinner air, so a gradient that felt manageable low down bites harder near the top. Break the climb into thirds and treat each one as its own event.

Pacing Notes

This is an effort to ride with your head, not your ego. On a climb averaging 8.61% for 17.4 km, sustainable power matters far more than any single surge. Anchor your pacing to your FTP and aim to hold a steady percentage of it, keeping a small reserve for the 23.95% ramps rather than blowing your matches on the lower slopes. If you are not sure what your threshold is, run the numbers through the FTP estimator before you commit to a target. From 290 m to 1791 m is a long time in the saddle — settle into a rhythm early, protect your cadence, and let the steep sections be the only place your effort spikes.

Gearing

Do not under-gear this one. With ramps reaching 23.95% and an 8.61% average that never eases, most riders will want the widest cassette they can fit. A compact 34-tooth chainring paired with a 34×32 setup is the sensible floor for strong climbers, but on gradients this steep a 34×34 gives you the extra cushion to keep spinning instead of grinding to a standstill on the worst pitches. The difference between 34×32 and 34×34 feels small on paper and enormous at 1791 m with tired legs. If your bike allows it, err toward the easier ratio — you can always leave gears unused, but you cannot invent them mid-ramp.

Summary

Bocchetta di Sommavalle earns its HC rating honestly: long, relentlessly steep, and topping out high. Gear low, pace to your threshold, and respect the ramps.

Length: 17.4 km
Average gradient: 8.61%
Max gradient: 23.95%
Start: 290 m
Summit: 1791 m
Net gain: 1501 m
Total ascent: 1456 m
Category: HC