Plasseggenpass

Overview

Plasseggenpass is an HC-category climb in Switzerland, and it earns that rating in the hardest way possible: through sustained, unrelenting steepness rather than sheer length. Over just 11.2 km it climbs from a start elevation of 665 m to a summit at 2,088 m, delivering a net elevation gain of 1,423 m. At 12.74% average gradient, this is not a climb you settle into — it is one you survive.

The number to sit with before you start is the gap between net gain and total work. The net elevation gain is 1,423 m, but the total ascent is 1,882 m — meaning roughly 459 m of climbing is undone by descents and dips along the way, only to be reclaimed. That undulation matters: you pay for every metre you lose, so the real vertical effort is closer to the 1,882 m figure than the tidier net number suggests. Treat this as a 1,882 m day in the legs, not a 1,423 m one.

How the Gradient Unfolds

The 12.74% average is a blend, not a constant. Undulation this pronounced means the average conceals both brief recovery and ramps far above it — the maximum touches 29.47%, steep enough to force you out of the saddle regardless of gearing.

• Short recovery or descending sections where you reclaim breath but lose altitude
• Repeated punchy climbs stacked back to back, each demanding a fresh surge
• The steepest ramp near 29.47%, where cadence collapses and it becomes about survival

Pacing Notes

On a climb this jagged, even-speed pacing is a trap. Chasing a constant velocity means burning matches on every ramp and coasting the dips — a fast route to blowing up. Pace to even effort instead: hold a steady, sustainable power output and let your speed rise and fall with the gradient. Accept that you will crawl on the 29.47% pitches and roll faster through the flatter breaks.

If you do not know your ceiling, establish it before race day with the FTP estimator. With undulation reclaiming 459 m of lost climbing, holding a disciplined effort is the difference between finishing and unravelling in the final third.

Gearing

A maximum gradient of 29.47% governs your setup entirely. A standard chainset will leave you grinding at a cadence that torches your legs. Run a compact (34-tooth inner) or, better, a sub-compact chainset, paired with a wide-range cassette — a 34×32 or 34×34 gives you the low gear those ramps demand. Check your setup before the ride: confirm the derailleur handles the largest sprocket and shifts cleanly under load. Discovering you are over-geared on a 29% wall is not a mistake you can fix mid-climb.

Summary

• Length: 11.2 km
• Average gradient: 12.74%
• Maximum gradient: 29.47%
• Net elevation gain: 1,423 m
• Total ascent: 1,882 m
• Category: HC

Plasseggenpass is a short climb with a long memory. Respect the undulation, pace to effort, gear low, and it becomes a hard but honest test rather than a day that ends you.