Col de Chermotane

Col de Chermotane cycling climb profile

Col de Chermotane is not defined by a savage average gradient. It is defined by duration. At 51.2 km, with 1643 m of net elevation gain from 472 m to 2115 m, this is the kind of climb that rewards restraint far more than aggression.

The headline average of 3.21% can make the climb look manageable on paper, but that number needs context. Over this much distance, a low average does not mean an easy ride. It means the work is spread out, and the physiological cost comes from staying engaged for a long time rather than surviving one continuous wall.

How the gradient unfolds

The profile points to a climb that gains altitude steadily rather than violently. Total ascent is 1704 m, only slightly more than the 1643 m of net gain, which suggests the route is predominantly uphill with some modest interruptions rather than a deeply rolling approach.

That matters for pacing. A climb with this ratio does not give back much free recovery. Even if the road eases, the general direction is still upward, and the body keeps accumulating fatigue.

The maximum gradient of 10.76% is the warning label. With an average of 3.21%, any section near the maximum will feel disproportionately hard, especially if it arrives after a long period of steady climbing. These ramps are not where the climb is won. They are where riders who have been riding slightly too hard for too long start paying for it.

Pacing strategy

Treat Col de Chermotane as an endurance climb with intermittent torque demands. The mistake is to let the gentler average gradient invite an optimistic start. Because the summit sits 1643 m above the start, the climb asks for a long, controlled effort before it asks for any heroics.

A practical approach:

• Ride the early kilometres conservatively, even if the gradient feels comfortable.
• Keep pressure smooth on the shallower sections rather than surging.
• Use the easier gradients to reset breathing and cadence, not to push the pace higher.
• On ramps approaching the maximum gradient, protect cadence and avoid standing accelerations unless necessary.

If pacing by feel, the correct opening effort should feel almost too easy. If pacing by power, anchor the effort around sustainable climbing output rather than chasing every change in slope. The length makes this closer to an aerobic management problem than a pure threshold test. For riders using power, reviewing /glossary/ftp before setting targets is more useful than guessing from the average gradient alone.

Gearing notes

The gearing choice should respect the maximum gradient, not just the average. A setup that feels efficient on steady 3% roads can become costly when the road tips above 10%, particularly late in a climb of this length.

Choose a low gear that lets you stay seated and keep cadence under control on the steepest pitches. The goal is not simply to get over the ramps. It is to get over them without spiking the effort so much that the following kilometres become damage control.

Col de Chermotane is a climb where patience compounds. The profile is long, mostly upward, and occasionally sharp enough to punish overconfidence. Ride it like the summit is earned gradually, because based on the numbers, that is exactly what this climb demands.