Passo di Trivera

Overview

Passo di Trivera is one of those climbs that leaves no room for excuses. Over 19.7 km it averages a punishing 9.8% gradient, hauling you from a valley floor at 253 m all the way up to a summit of 2183 m. That is 1930 m of net elevation gain packed into a single sustained effort, and the total ascent of 1903 m confirms there is almost no respite along the way. It carries the HC (hors catégorie) label — the hardest rating there is, sitting above categories 1 through 4 — and every one of those numbers earns it.

An average of 9.8% is not a figure you coast through. On most long climbs the average is softened by flatter stretches; here, the near match between net gain and total ascent tells you the road simply goes up, and keeps going up, for the better part of 20 km.

How the Gradient Unfolds

Because total ascent (1903 m) sits so close to the net gain (1930 m), this is a climb with virtually no downhill or false-flat recovery built in. What you see on the profile is what you get: a long, steady wall. From the 253 m base, the road climbs almost continuously toward the 2183 m summit, meaning the 9.8% average is likely reflective of what you feel underneath you for most of the ascent rather than an artifact of a few brutal ramps.

Practically, that changes how you should read the climb. There is no "just get to the flat bit and recover" moment to aim for. Your rhythm has to be sustainable from the very first kilometer, because the gradient that greets you early is broadly the gradient that will still be there near the top — only now at over 2100 m of altitude, where thinner air adds its own tax.

Pacing Notes

The single biggest mistake on a climb like this is starting too hard. With 19.7 km ahead at 9.8%, pacing off your FTP is essential — aim to settle just below threshold and hold it, rather than surging early and paying for it in the final third. If you do not know your current threshold, run your numbers through the FTP estimator before you commit to this one.

Break the effort into mental blocks and treat the whole thing as one long tempo-to-threshold grind. Because the gradient barely relents, your power should stay remarkably steady; watch for the temptation to chase a wheel on the rare shallower pitch. Fuel and hydrate early, since the effort at altitude near the 2183 m summit will feel harder than the same watts lower down.

Gearing

Do not under-gear this one. At a 9.8% average sustained for 19.7 km, most riders will want more range than a standard road setup provides. A compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 works for strong climbers who can hold a solid cadence under load, but many will be far happier with a 34×34 (or easier) to keep the legs spinning rather than grinding. Given there is no recovery gradient to spin out the legs, err toward the easier ratio — you will use it.

Summary

Passo di Trivera is a pure test of sustained climbing: nearly 20 km of unbroken gradient with a summit deep into high-mountain altitude. Pace it off threshold, gear it generously, and respect the HC rating every meter of the way.

Length: 19.7 km
Average gradient: 9.8%
Max gradient: n/a
Start: 253 m
Summit: 2183 m
Net gain: 1930 m
Total ascent: 1903 m
Category: HC