Col de Sevi

Overview

Col de Sevi is a category 1 climb in France, running 11.2 km from a start elevation of 234 m to a summit at 1101 m. Over that distance it delivers a net elevation gain of 867 m at an average gradient of 7.74%. As a first-category ascent, it sits firmly in the territory that separates trained climbers from occasional ones: long enough to matter, steep enough to hurt.

The number to watch is the gap between the 867 m net gain and the 1253 m of total ascent. That 386 m difference is climbing you do twice, because the road gives back roughly that much in descent along the way. The profile undulates rather than rising cleanly, so you cannot settle into one rhythm and hold it. Every dip means a fresh acceleration back onto the gradient, and those repeated efforts cost far more than the tidy 7.74% average suggests.

How the Gradient Unfolds

The 7.74% average is a blend, not a description. Because the climb undulates through 386 m of extra ascent, the average is dragged down by flatter and descending sections while the working ramps run considerably steeper. Read the average as a floor for the hard bits, not a target.

• Flatter and false-flat recovery sections where the road eases or briefly drops, deceptively welcome mid-climb.
• Repeated short climbs stacked back to back, each one asking you to re-launch after a descent.
• The steepest ramp, well into double digits, where cadence collapses if your gearing is wrong.

Pacing Notes

On a smooth climb you can ride even-effort and let speed vary. Here, the undulation makes even-effort harder to hold: hammering every short pitch drives you over threshold, while coasting the dips wastes the gain. Aim for even effort, capping your output near your sustainable power output on the steep ramps and easing on the descents rather than sprinting them. Do not chase a constant speed; the terrain will not allow it. If you do not know your ceiling, run the FTP estimator beforehand and set a number you can defend for the full 11.2 km.

Gearing

The steepest pitch is what governs your setup, not the average. On a ramp this severe, a compact or sub-compact chainset paired with a wide-range cassette is the sensible baseline — think 34×32 or 34×34 to keep cadence up when the gradient bites. Under-gearing here means grinding at low rpm, which burns matches you need for the pitches still ahead. Check your chainring and cassette combination before the ride, not at the foot of the climb.

Summary

• Length: 11.2 km
• Average gradient: 7.74%
• Net elevation gain: 867 m
• Total ascent: 1253 m
• Category: 1

Col de Sevi rewards riders who respect the difference between its average and its reality. Pace to the ramps, gear for the steepest, and treat the 386 m of extra ascent as the real challenge — not the summit height alone.