Col d'Angolon

Overview

Col d'Angolon is a hors catégorie climb, the hardest rung on the classification ladder above categories 1, 2, 3, and 4. Over 14.6 km it averages 7.58%, lifting you from a start elevation of 668 m to a summit of 1771 m. That is a net elevation gain of 1103 m, with 1081 m of total ascent measured across the road's rises and dips. On paper the average is brutal; in the legs, it is the length combined with that steepness that defines the day. There is nowhere to hide on a climb that holds 7.58% for the better part of an hour, and the 20.45% max gradient promises at least one moment where the road simply stands up in front of you.

How the Gradient Unfolds

The gap between the 7.58% average and the 20.45% maximum tells the real story. Averages smooth out the pain; maximums reveal it. Expect the grade to oscillate around that mean for long stretches, then spike sharply where the road pitches toward its steepest 20.45% ramp. Because net gain (1103 m) exceeds total ascent (1081 m) only slightly, this is a relentlessly upward road rather than a rollercoaster of false flats and recovery descents. In practice that means very few chances to freewheel and reset. You climb, and you keep climbing, for all 14.6 km. Treat the steepest ramp as the crux and everything before it as controlled accumulation of fatigue.

Pacing Notes

An HC climb of this length rewards discipline over bravado. Anchor your effort to your FTP and settle into a sustainable rhythm early, because 14.6 km at 7.58% will expose anyone who starts too hot. Aim to ride the bulk of the climb just under threshold, then hold something in reserve for the 20.45% pitch, which will briefly force you well above your steady-state number. If you do not know your threshold, run your figures through the FTP estimator before you commit to a race-day plan. The goal is to arrive at the steepest ramp with enough headroom to survive it without blowing apart on the runway of climbing that still remains to 1771 m.

Gearing

Gear for the max, not the average. A 20.45% ramp near the end of a 14.6 km climb is where undergeared riders grind to a halt. A 34×32 is a sensible baseline for the sustained 7.58% sections, but for that steepest pitch a 34×34 gives you the extra spin to keep cadence up and torque manageable. If your setup allows it, favour the 34×34 for insurance on an HC effort of this magnitude, save your knees over 1103 m of gain, and let your legs, not your gears, be the limiting factor.

Summary

Col d'Angolon is a genuine HC test: long, steep, and topped by a leg-breaking ramp. Pace it to your threshold, gear it for the 20.45% wall, and respect all 14.6 km of it.

Length: 14.6 km
Average gradient: 7.58%
Max gradient: 20.45%
Start: 668 m
Summit: 1771 m
Net gain: 1103 m
Total ascent: 1081 m
Category: HC