Passo di Pianca Bella

Overview

Passo di Pianca Bella is a genuine hors catégorie effort — the hardest classification on the scale ahead of category 1, 2, 3 and 4. It runs 18.3 km from a base at 395 m to a summit of 1673 m, and while the headline average of 6.99% looks approachable on paper, the total picture is anything but. You gain 1278 m of net elevation across the ascent, with 1261 m of total climbing packed into those kilometres. That length combined with an HC label tells you everything: this is a climb you settle into for the better part of an hour, not one you attack from the bottom.

How the Gradient Unfolds

The 6.99% average is a smoothed number that hides real teeth. With a maximum pitch of 23.37%, there are ramps here that more than triple the average gradient — the kind of wall that forces you out of the saddle whether you planned to or not. The gap between net gain (1278 m) and total ascent (1261 m) is small, which signals a climb that keeps pointing upward rather than trading altitude back on descents. Expect the difficulty to come in the steep spikes rather than a single relentless slope: stretches near the average punctuated by savage kicks toward that 23.37% max. Reading the road ahead and shifting early before each ramp is what keeps you rolling.

Pacing Notes

On a climb this long, discipline beats bravado. Anchor your effort to your FTP and hold a sustainable percentage of it through the shallower sections, saving a little headroom for the steep ramps where power naturally surges. If you go too deep on an early wall, the sheer 18.3 km distance will punish you long before the 1673 m summit. Not sure what your threshold is? Run the numbers through the FTP estimator before you ride, then translate that into a target you can actually defend for the full ascent. The goal is to crest with something left, not to blow apart on a 23.37% pitch two-thirds of the way up.

Gearing

Do not under-gear for this one. With a maximum of 23.37% and 1278 m to grind through, a compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 will get most fit climbers over the top, but on the steepest ramps you will be thankful for the extra relief of a 34×34 — it keeps your cadence alive when the road rears up and protects your knees over a climb this sustained. If your bike allows an even easier bailout gear, take it; spinning beats grinding on an HC ascent.

Summary

Passo di Pianca Bella is a long, steep HC test that rewards patient pacing and honest gearing. Respect the 23.37% ramps, ride to your threshold, and let the 18.3 km come to you.

Length: 18.3 km
Average gradient: 6.99%
Max gradient: 23.37%
Start: 395 m
Summit: 1673 m
Net gain: 1278 m
Total ascent: 1261 m
Category: HC