Passo Buole

Overview

Passo Buole is an HC climb, the hardest category on the scale, and the numbers explain why. Over 16.2 km the road lifts you from a start elevation of 176 m to a summit at 1770 m, a net gain of 1594 m. The average gradient is a punishing 9.86%, and the steepest pitch bites at 15.81%. This is not a climb with a token flat kilometre where you recover — the average alone tells you the road tilts hard for nearly its entire length. Sixteen kilometres at almost 10% is a serious, sustained effort that rewards patience and honest self-assessment far more than early aggression.

How the Gradient Unfolds

Think about what a 9.86% average over 16.2 km actually means: there is very little slack anywhere. With the maximum at 15.81%, the steepest ramps sit roughly 6 percentage points above the average, so the hardest sections are a meaningful step up but not a wall that dwarfs the rest. That shape matters. On climbs with a low average and a spiky maximum you can float the flats and grind the ramps. Here the baseline is already brutal, so the steep pitches stack fatigue onto legs that are never truly resting. Expect long stretches hovering near double digits, punctuated by ramps pushing toward 15.81%. The total ascent of 1563 m sits just below the 1594 m net gain, confirming there is almost no descending along the way — every metre of elevation is earned going up.

Pacing Notes

On a climb this long and this steep, pacing is everything. Anchor your effort to your FTP and resist the urge to chase the early ramps. A sustainable target for a 16.2 km HC effort is a controlled tempo that you can hold when the road hits 15.81%, not a pace that feels comfortable in the opening kilometre. If you do not know your threshold, run the numbers through the FTP estimator before you commit. The key discipline is keeping your power steady across the steep pitches rather than surging — every match you burn early on a 1594 m ascent is one you will desperately want back near the 1770 m summit. Fuel and drink on schedule, because the effort is long enough that under-fuelling will cost you more than any pacing error.

Gearing

Do not under-gear this climb. At a 9.86% average stretching to 15.81%, you want a compact chainring and a wide cassette so you can spin rather than grind. A 34×32 is the sensible minimum for strong climbers, giving a low enough ratio to hold cadence through the sustained double-digit sections. For most riders — and anyone worried about the steep 15.81% ramps or riding this fresh off a long day — a 34×34 is the smarter choice, buying you extra margin to keep the pedals turning instead of stalling. Over 16.2 km, protecting your cadence protects your legs.

Summary

Passo Buole is a genuine HC test: 16.2 km, an unrelenting 9.86% average, a 1594 m net gain and almost no respite. Pace it with your threshold, gear it generously, and treat the summit at 1770 m as the reward for discipline rather than bravado.

Length: 16.2 km
Average gradient: 9.86%
Max gradient: 15.81%
Start: 176 m
Summit: 1770 m
Net gain: 1594 m
Total ascent: 1563 m
Category: HC