Passo di Rabbi - Rabbijoch

Overview

Passo di Rabbi, also known as the Rabbijoch, is a hors catégorie climb — the hardest rating on the road, sitting above categories 1, 2, 3 and 4. The numbers explain why. It runs 23.8 km from a valley floor at 574 m to a summit at 2459 m, and over that distance the road averages a punishing 7.91%. That combination of length and sustained steepness puts it firmly in the top tier of European ascents.

The headline figure is the 1885 m of net elevation gain. With 1914 m of total ascent, the profile is almost entirely uphill — only about 29 m of that climbing is "given back" through brief dips or flatter respites. In practical terms, once you turn the pedals at the bottom you are going up, and you keep going up for the better part of an hour or more.

How the Gradient Unfolds

A 7.91% average across 23.8 km is not a wall you sprint at; it is a wall you lean into for a very long time. Because total ascent (1914 m) barely exceeds net gain (1885 m), there are no meaningful recovery descents to reset your legs. The climb offers almost no free rolling — the road simply tilts up and holds that pitch.

Expect the difficulty to come from accumulation rather than any single dramatic ramp. Sections steeper than the average will feel brutal precisely because there is nowhere to hide afterward; the gradient does not slacken enough to spin the tension out of your legs. Treat the whole 23.8 km as one continuous effort broken into mental segments, not as a series of separate climbs.

Pacing Notes

On a climb this long, discipline beats bravado. Your FTP is the number that matters most here — the sustainable power you can hold for roughly an hour. Ride the lower slopes a touch below the intensity you think you can manage, because a 7.91% average over 23.8 km punishes anyone who starts hot.

If you don't know your current threshold, use the FTP estimator before you plan your effort. Once you have that figure, target a steady power just under it for the bulk of the 1885 m of gain, and keep something in reserve for the upper stretches near 2459 m, where thinner air quietly saps your output.

Gearing

Bring climbing gears — this is not a place to be over-geared. For most riders a compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 is the minimum I'd suggest for a sustained 7.91% over 23.8 km, and it will feel tight on the steeper pitches.

If your legs or your loaded weight give you any doubt, size up to a 34×34. That extra tooth lets you keep a higher cadence at the same power, which protects your knees and preserves your threshold effort across all 1885 m of climbing. On an HC ascent this long, easier gearing is almost never a mistake.

Summary

Passo di Rabbi is a genuine HC test: long, steep and unrelenting, with 1885 m of net gain packed into 23.8 km at 7.91%. Pace it with your threshold in mind and gear it generously.

Length: 23.8 km
Average gradient: 7.91%
Max gradient: n/a
Start: 574 m
Summit: 2459 m
Net gain: 1885 m
Total ascent: 1914 m
Category: HC