Col de l'Épine

Overview

The Col de l'Épine is a category 1 climb that packs a genuine day's effort into 12.3 kilometres. From a start elevation of 238 m it rises to a summit of 989 m, giving a net elevation gain of 751 m. The average gradient of 6.12% sounds civilised, and for long stretches it is — but the total ascent of 825 m tells you the road rolls rather than climbs in one clean line, and the max gradient of 16.18% warns that at least one ramp will test your composure.

At this length and steepness, l'Épine sits firmly in the territory of a serious mountain climb. It is not a wall you can muscle over in a few minutes, nor a gentle drag you can spin away — it is a sustained, honest effort that rewards riders who read the road and pace themselves.

How the Gradient Unfolds

The headline figure is 6.12% averaged across 12.3 km, but averages hide the story. The difference between the 6.12% mean and the 16.18% maximum is more than ten percentage points, which means the climb is far from uniform. Expect passages that sit comfortably below the average — where you can breathe and recover — punctuated by steeper pitches that spike toward that 16.18% ceiling.

The gap between net gain (751 m) and total ascent (825 m) confirms there are false flats or brief descents along the way. That extra 74 m of climbing is real work you pay for without gaining permanent altitude, so mentally bank it: every metre lost must be re-climbed before you reach 989 m.

Pacing Notes

The smartest way to ride a climb this long is by effort, not ego. Anchor your pace to your FTP and aim to hold a steady, repeatable power on the average-gradient sections while allowing controlled surges over the steep ramps toward 16.18%. If you go into the red early on those pitches, the remaining kilometres to the summit will punish you.

If you are unsure of your threshold number, run it through the FTP estimator before you plan your target power. Over 12.3 km and 751 m of net gain, a well-judged threshold-based pace will beat a fast start every time.

Gearing

For a category 1 climb averaging 6.12% with ramps to 16.18%, give yourself margin. A compact chainring paired with a wide-range cassette is the sensible baseline. A 34×32 will get most fit riders up the steady sections and over the shorter steep pitches without grinding to a crawl.

If you carry endurance weight, ride on tired legs, or simply prefer to spin, step up to a 34×34. That extra sprocket makes the 16.18% ramp far more manageable and lets you protect your effort for the full 12.3 km rather than blowing up on a single steep section.

Summary

The Col de l'Épine is a rewarding category 1 climb: long enough to demand real pacing, steep enough in places to demand real gearing, and honest enough that a smart ride is always faster than a brave one. Respect the 16.18% ramps, spin the false flats, and let the summit at 989 m come to you.

Length: 12.3 km
Average gradient: 6.12%
Max gradient: 16.18%
Start: 238 m
Summit: 989 m
Net gain: 751 m
Total ascent: 825 m
Category: 1