Col de Vence

Overview

Col de Vence is a category 1 climb that asks a real question of your legs. Over 11.3 km it averages 6.74%, lifting you from a start elevation of 204 m to a summit at 963 m. That is a net gain of 759 m, and with total ascent of 963 m the road never truly lets you coast — what goes up mostly keeps going up. Category 1 sits one rung below hors catégorie, the hardest tier, and Col de Vence earns its place there through sustained effort rather than a single brutal wall. Expect roughly the length and pitch of an hour-defining test piece: long enough to matter, steep enough to hurt.

How the Gradient Unfolds

The headline number is 6.74%, but averages hide the story. The defining feature here is a maximum gradient of 17.51% — more than double the average. That single ramp is the moment the climb reveals its teeth, and everything in your pacing should account for it. Around it, the road hovers near that 6.74% mean, occasionally easing and occasionally stiffening. With 759 m of net gain spread across 11.3 km, you are climbing steadily almost the entire way; there is little flat recovery to hide in. Treat the profile as a long, consistent grind punctuated by one sharp spike, and you will read the climb correctly.

Pacing Notes

Consistency wins on Col de Vence. Because the average sits at 6.74% over 11.3 km, this is a sustained tempo effort, so anchor your pacing to your FTP rather than gambling on early enthusiasm. Ride the lower slopes a touch under threshold to bank energy for the 17.51% pitch, where power spikes are unavoidable and costly. If you do not know your threshold yet, run the numbers through the FTP estimator before you commit to a target — going out too hard on a climb this long is the classic way to blow up before the summit at 963 m. Aim for even effort, absorb the steep ramp with a brief acceptance of higher output, then settle back to rhythm.

Gearing

With a 6.74% average and a 17.51% maximum stretched over 11.3 km, gearing is your friend. For most riders a compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 will get fit riders up the sustained sections comfortably, but the 17.51% ramp is where a 34×34 pays for itself — that extra sprocket keeps your cadence alive when the road kicks up and spares your knees over 759 m of climbing. If you tend to grind or you are carrying fatigue, choose 34×34 and thank yourself near the top.

Summary

Col de Vence is a proper category 1 test: 11.3 km of steady climbing at 6.74%, one vicious 17.51% ramp, and 759 m of net gain to a 963 m summit. Pace it evenly, gear it generously, and it rewards you.

Length: 11.3 km
Average gradient: 6.74%
Max gradient: 17.51%
Start: 204 m
Summit: 963 m
Net gain: 759 m
Total ascent: 963 m
Category: 1