Passo della Mulattiera

Overview

Passo della Mulattiera is a hors catégorie (HC) climb in Italy that runs for 7.8 km. Over that distance it delivers a net elevation gain of 1,054 m, starting at 1,301 m and topping out at a summit of 2,355 m. This is high-altitude terrain from the very first pedal stroke, and the HC rating is earned honestly: an average gradient of 13.55% over nearly eight kilometres is exceptional, placing this climb well beyond the range most riders train for.

Look closer and the numbers tell a second story. The total ascent is 1,184 m, but the net gain is only 1,054 m — a 130 m gap. That means roughly 130 m of descending is folded into the route, so you climb more than the net figure suggests. Every metre of downhill has to be re-climbed, and each transition breaks your rhythm. On a climb this steep, that undulation makes the effort harder than a smooth 1,054 m ascent would be.

How the Gradient Unfolds

An average gradient of 13.55% is already severe, but averages flatten out the real shape of a climb. Because 130 m of descending is baked in, the true climbing pitches must be steeper than 13.55% to compensate — and the steepest ramp reaches 39.18%. Expect the road to swing violently between brief respites and near-vertical walls rather than settling into a steady grind.

• Short recovery or descending sections that interrupt your rhythm and eat into the net gain
• Repeated steep pitches stacked back-to-back with little transition
• A maximum ramp of 39.18% — a wall that demands you are already in your easiest gear before it hits

Pacing Notes

On a smooth climb you can pace to even effort. Here, the undulation makes that harder: even-speed pacing will spike your power on every steep pitch and waste it on the descents. Instead, target a steady sustainable power output on the climbing sections and soft-pedal the brief downhills to recover — do not chase speed through them. Anchor your target to a tested number rather than feel; use the FTP estimator to set a ceiling you can hold for the full 7.8 km, then treat the steepest ramps as short over-efforts you accept, not surprises that blow you up.

Gearing

Gearing here is governed by the steepest gradient, not the average. A ramp of 39.18% will overwhelm any standard road setup. Run a compact or sub-compact chainset paired with a wide-range cassette — think 34×32 or 34×34 as a minimum — and consider even lower if your legs or the load demand it. Check your setup before the ride, not at the base. Confirm the chain shifts cleanly into your largest sprocket under load, because on this climb you will need every tooth.

Summary

• Length: 7.8 km
• Average gradient: 13.55%
• Maximum gradient: 39.18%
• Net elevation gain: 1,054 m
• Total ascent: 1,184 m
• Category: HC

Passo della Mulattiera is a short but uncompromising HC climb. Respect the undulation, pace to power on the steep sections, arrive with gearing built for a 39.18% wall, and the summit at 2,355 m is within reach.