coll de la Perxa

Overview

Coll de la Perxa sits in France as a Category 3 climb — short enough to attack, awkward enough to punish riders who don't pace it honestly. The road covers 7.5 km from start to summit, gaining 277 m net with a total ascent of 366 m. That gap between net gain and total ascent tells you something important: the road doesn't simply rise in a straight line. There are undulations along the way, meaning you accumulate more climbing in your legs than the headline elevation difference suggests.

The start elevation is already at 1,306 m, so you're not approaching this from sea level. Legs that feel fresh at lower altitudes may notice the difference.

How the Gradient Unfolds

The average gradient of 3.68% is low enough to seem approachable. Don't let it set your expectations. A 14.39% maximum gradient is waiting somewhere on this road — more than three times the average — and that kind of spike requires real respect.

With 366 m of total ascent spread across 7.5 km, the climb is not a steady ramp. The difference between total ascent and net gain implies descending or flat sections interrupt the climbing, which means the steep pitches are concentrated. When the road kicks up, it does so sharply and briefly rather than grinding you down over a long sustained wall.

What to Expect Sector by Sector

• Lower slopes: Starting at 1,306 m, the road begins its work. The moderate average suggests the opening kilometers may feel manageable, even rolling.
• Middle section: This is where the character of the climb is likely defined. The undulating profile means effort is not constant — you may get brief recoveries followed by abrupt steepening.
• The spike: That 14.39% maximum will appear somewhere before the summit at 1,583 m. Without kilometer-by-kilometer data, the precise location is unknown, but be ready for it in any upper section. A sudden ramp after a flatter stretch is a common trap on climbs like this.

Pacing Notes

Because the average gradient undersells the difficulty, riders who rely purely on feel — or who target a fixed watts per kilogram output calibrated to a steady 3.68% — risk blowing up on the steep pitches.

A better approach:

• Set a ceiling power based on your FTP and hold it through the easier sections rather than surging. This keeps something in reserve for the steeper pitches.
• Use the flat or descending segments as active recovery, not as an opportunity to accelerate.
• On the 14.39% ramp, accept a power spike if needed, but keep cadence from dropping too low. Grinding at a slow cadence through a short steep section costs more than a brief, controlled effort at higher power.

Gearing

For a 3.68% average you don't need an ultra-low gear ratio, but the 14.39% maximum changes the calculation. A compact chainset or a wide-range cassette is worth having. If you're running a standard double, confirm your lowest gear handles over 14% before committing — an unprepared rider walking a short ramp on a Cat 3 climb is an avoidable outcome.

Use the FTP estimator to check what power you should realistically sustain here before the ride, not after.

Summary

Coll de la Perxa is not a sufferfest, but it's not a warmup either. Its modest average disguises real gradient variation and a sharp maximum that will sort riders who paced it correctly from those who didn't. Respect the total ascent figure more than the net gain, keep power controlled through the easier sections, and have the right gear ready for when the road bites.