Passo Due Sassi

Overview

Passo Due Sassi is a genuine hors catégorie climb, and the numbers leave no doubt about it. Over 10.8 km the road averages 9.36%, dragging you from a start elevation of 106 m up to a 1116 m summit. That is 1010 m of net elevation gain packed into a distance most riders would happily cover on the flat in twenty minutes. The total ascent measures 975 m, confirming that this is a road that climbs almost without pause — there is precious little false-flat or recovery built into its shape. Add a maximum gradient of 17.84% and you have a climb that punishes anyone who arrives without a plan.

How the Gradient Unfolds

A 9.36% average across 10.8 km is brutal precisely because it is so sustained. Climbs with a gentler mean often hide their difficulty in a few savage pitches; here the difficulty is spread evenly, so the pressure never lifts. Expect long stretches sitting close to the average, punctuated by ramps that push toward the 17.84% maximum. When a climb's average is this high, even the "easier" sections rarely dip into truly restful territory — the gap between the 9.36% mean and the 17.84% peak is 8.48%, which tells you the steepest ramps are only a little more than double the average you will already be grinding through. Treat every steep pitch as temporary and keep the overall rhythm intact.

Pacing Notes

On a climb this relentless, pacing is everything. The right target is a steady effort anchored to your FTP rather than to how you feel in the first kilometre. Because the gradient barely relents, going out hard will cost you far more here than on a variable climb — there is no downhill or flat to bail you out. If you do not know your threshold, run the numbers through the FTP estimator before you start, then hold a percentage of that figure you can sustain for the full 10.8 km. Meter your effort so that the 17.84% ramps cause a controlled surge, not a blow-up, and settle straight back to your target power once each pitch eases.

Gearing

With a 9.36% average and pitches up to 17.84%, gearing is not a luxury — it is what keeps your cadence and your knees intact over 1010 m of climbing. A compact 34-tooth front paired with a wide cassette is the sensible baseline. A 34×32 will get most fit riders up the more sustained stretches, but on the steepest ramps toward 17.84% you will be thankful for a 34×34, which buys precious extra cadence when the road stands up. If your legs or your setup allow anything easier still, this is exactly the climb to use it on.

Summary

Passo Due Sassi is a compact, unrelenting HC ascent that rewards patience and honest pacing. Respect the average, survive the ramps, and the 1116 m summit is yours.

Length: 10.8 km
Average gradient: 9.36%
Max gradient: 17.84%
Start: 106 m
Summit: 1116 m
Net gain: 1010 m
Total ascent: 975 m
Category: HC