Fausse Brèche

Overview

Fausse Brèche is a hors catégorie (HC) climb in France, running 14.1 km from a start elevation of 1,090 m to a summit at 2,816 m. On paper it delivers a net elevation gain of 1,726 m at an average gradient of 12.28%, placing it firmly among the hardest sustained ascents you can attempt. The category is not a formality here: the length and the height gained combine into an effort that will define your entire day.

The number that matters most is not on the sign at the bottom. Net gain is 1,726 m, but total ascent is 2,510 m — a difference of 784 m. That gap is undulation: the road repeatedly drops and climbs again rather than rising cleanly. In practice you pay for those 784 extra metres with your legs even though they never show up in the net figure, and the descents in between rarely give back what they cost. Budget for a harder ride than the average gradient suggests.

How the Gradient Unfolds

A 12.28% average is already severe, but an average smooths over the shape of the road. The undulation means the gradient swings well above and below that mean, and the recovery you get on the shallower sections is short and interrupted.

• Flatter or downhill recovery sections that are brief and do not fully reset your legs
• Repeated short climbs stacked back to back, each resetting your rhythm
• The steepest ramp landing well above the 12.28% average, where a poor gear choice ends your ride

Treat the profile as a series of efforts, not one long grind.

Pacing Notes

On a smooth climb you can hold even effort and let speed vary. Fausse Brèche's undulation makes that harder: even-effort pacing is still the goal, but you must actively resist surging on the short pitches and coasting on the dips. Chasing an even speed here will blow you up, because holding pace over the steep ramps demands power you cannot sustain for 14.1 km.

Anchor your ride to your sustainable power output and hold a target that leaves margin for the steepest sections. If you do not know your number, run the FTP estimator before you go and set a ceiling you can defend to the summit.

Gearing

The steep ramps govern your setup, not the average. On gradients this severe you want a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you a bailout for the steepest pitches without cross-chaining. If your smallest gear leaves you grinding at low cadence on a test hill, it is too tall for this climb.

Check your chainset and cassette before the ride, not at the trailhead. Swapping a cassette takes minutes at home and is impossible mid-climb.

Summary

• Length: 14.1 km
• Average gradient: 12.28%
• Net elevation gain: 1,726 m
• Total ascent: 2,510 m
• Category: HC

Fausse Brèche rewards riders who respect the numbers: come with low gearing, a pacing plan built on sustainable power, and the discipline to hold back over 784 m of hidden undulation. Do that, and the summit at 2,816 m is yours.