Forcella Bregain

Overview

Forcella Bregain is a genuine hors catégorie effort, the kind of climb that rewards judgment as much as fitness. Over 33.5 km it lifts you from a valley floor at 103 m all the way to a 1798 m summit, a net elevation gain of 1695 m. That length alone puts it in the endurance-climb category rather than the short-and-savage bracket: this is an hour-plus of continuous work for most riders.

The headline average gradient is a deceptively gentle 5.05%. Do not be fooled. On a climb this long, the average smooths over a lot of variation, and Bregain hides a max gradient of 24.36% somewhere in its 33.5 km. The total ascent of 1663 m sits just below the net gain of 1695 m, which tells you the road climbs almost continuously with very little given back — there are no long descents to recover on.

How the Gradient Unfolds

The relationship between the numbers is where the story lives. A 5.05% average across 33.5 km with a net gain of 1695 m means most of the road is manageable, sitting comfortably in the tempo range. But a 24.36% max is nearly five times steeper than the average, so those ramps are outliers — short, sharp walls that spike your effort and then release.

Because total ascent (1663 m) is only 32 m shy of the net gain (1695 m), the profile is overwhelmingly one-directional: up. You will not get meaningful recovery from downhill sections. That makes the steep pitches more punishing than they would be on a rolling climb, because you arrive at them already loaded with fatigue and cannot shed it afterward.

Pacing Notes

On a climb of this length, pacing is everything. Anchor your effort to your FTP and aim to spend the bulk of the 33.5 km sitting just below threshold, where the 5.05% average lets you settle into a sustainable rhythm. If you do not have a recent number, run the FTP estimator before your attempt so your targets are real rather than guessed.

The danger is the 24.36% max. When those ramps arrive, resist the urge to hold power — let your speed drop, keep your cadence turning, and accept a brief spike above threshold rather than blowing your whole 1695 m of climbing in one heroic push. Treat the walls as short overloads, then reset your rhythm the moment they ease.

Gearing

For 33.5 km averaging 5.05% you want range and comfort, not aggression. A compact chainring is essential, and your rear cassette should give you an easy escape gear for the 24.36% pitches. A 34×32 is the sensible minimum here — it covers the tempo majority of the climb well and just about survives the steep ramps.

If you know you climb below threshold, or you are carrying fatigue into the final third of the 1695 m gain, size up to a 34×34. That extra sprocket keeps your cadence alive on the walls and protects your knees over an hour-plus of continuous ascent. On an HC climb this long, spinning is always cheaper than grinding.

Summary

Forcella Bregain is a patience climb with a sting: 33.5 km of near-continuous ascent at a friendly 5.05% average, punctuated by a 24.36% wall that demands respect. Pace to your threshold, gear generously, and let the numbers do the work.

Length: 33.5 km
Average gradient: 5.05%
Max gradient: 24.36%
Start: 103 m
Summit: 1798 m
Net gain: 1695 m
Total ascent: 1663 m
Category: HC