Col de Susanfe

Col de Susanfe cycling climb profile

The Col de Susanfe is a long Swiss category 1 climb: 23.7 km from a start elevation of 411 m to a summit elevation of 1,656 m. On paper, the average gradient of 5.26% looks controlled rather than savage, but that number should not be read as permission to start casually hard. The climb gains 1,245 m net, with 1,264 m of total ascent, which means the route is fundamentally uphill with only a small amount of relief across the full distance.

The most important detail is the gap between the average and the maximum gradient. A climb averaging 5.26% but touching 12.07% is not a steady tempo ramp from bottom to top. It asks for a patient endurance effort on the longer, more manageable sections, then enough reserve to absorb steeper pitches that are more than twice the average gradient.

How the gradient unfolds

With only the headline profile available, the safest way to read the Col de Susanfe is as a long climb with variable resistance rather than a short, decisive wall. The average gradient tells you the climb can be ridden rhythmically for long periods. The maximum gradient tells you that rhythm will be interrupted.

That combination matters because the cost of overpacing early is delayed. On a 23.7 km ascent, the first half can feel deceptively sustainable if you ride the average gradient rather than the duration. But the climb still has 1,245 m of net elevation gain to collect, and any repeated surge above threshold will make the steeper sections later feel far heavier than their gradient alone suggests.

Pacing strategy

Ride this as a controlled aerobic climb first, not as a sequence of ramps to attack. If using power, anchor the opening effort below your sustainable climbing ceiling and avoid chasing speed when the road eases. The profile rewards smoothness because the total length is the main difficulty.

A useful approach is:

• Start conservatively until the climb settles into its rhythm.
• Let the 5.26% average guide your baseline effort, not your ambition.
• Treat any pitch near the 12.07% maximum as a place to protect momentum, not prove form.
• Keep enough margin that the final part of the 1,245 m net gain can be ridden seated and controlled.

If you are unsure what power range is realistic, anchor the effort to your /glossary/ftp rather than to early-climb sensations.

Gearing notes

The gearing decision should be made for the 12.07% maximum gradient, not the 5.26% average. A setup that feels efficient on the moderate sections may become too heavy when the road steepens, especially late in a 23.7 km effort. Prioritize a low gear that lets you stay seated and keep pressure smooth through the steepest ramps.

The Col de Susanfe is not defined by one explosive statistic. Its difficulty comes from the accumulation: category 1 length, sustained elevation gain, and enough steepness to punish riders who misread the average gradient as the whole story.