Sertig

Sertig cycling climb profile

Sertig is an HC-rated climb in CH, and the headline number tells only part of the story. At 21 km with an average gradient of 6.62%, it is long enough to behave like a true endurance climb rather than a short power test. The road rises from 1,344 m to 2,735 m, gaining 1,391 m net from bottom to summit.

That combination matters. A 6.62% average over 21 km is already a sustained aerobic demand, but the maximum gradient of 22.78% changes the way it should be ridden. This is not a climb to pace by the average alone. The average says the day will be long; the maximum says there are sections where torque, gearing, and restraint become decisive.

How the gradient rides

Without a detailed kilometre-by-kilometre breakdown, the safest reading of the profile is that Sertig is not a smooth metronomic climb. The gap between the average gradient and the maximum gradient is too large for that. Any easier or steadier sections are effectively balanced by ramps that are steep enough to force a meaningful change in cadence and power.

The practical implication is simple: the climb rewards riders who keep the early effort controlled and leave room for forced surges. If you ride the opening kilometres as if 6.62% is the whole story, the 22.78% pitches will push you above threshold whether you want them to or not. That is where pacing errors compound. A short steep ramp after already burning matches can turn a manageable HC climb into a slow grind.

Pacing strategy

Treat Sertig as a long threshold-management problem. The target should be sustainable pressure, not early speed. Riding just under your climbing limit for the first half gives you the flexibility to absorb the steepest sections without detonating.

Use perceived exertion alongside power. On a climb this long, small changes in gradient can make the same power feel very different, especially once cadence drops on the steeper ramps. If using power, anchor the main body of the climb around a controlled effort relative to your /glossary/ftp, then accept brief spikes only where the gradient forces them.

Gearing notes

Bring low gearing. The 22.78% maximum gradient is the key number for setup, not the 6.62% average. A gear that feels comfortable on a steady mid-gradient climb may be too heavy here once fatigue and steep ramps overlap.

The aim is to preserve cadence as much as possible. Grinding at low cadence early will add muscular fatigue before the climb has fully played out. For most riders, the right gear choice is the one that feels almost too easy on the steadier sections but still gives control when the road tilts hard.

Bottom line

Sertig is a long HC climb with enough average gradient to demand endurance and enough maximum gradient to punish overconfidence. Ride it conservatively at first, gear for the steepest ramps, and let the climb come back to you rather than trying to beat it from the bottom.