Klausenpass

Overview

Klausenpass is a genuine hors catégorie climb, and the numbers leave no doubt about it. Over 17.9 km the road lifts you from 504 m at the base to 1956 m at the summit, a net gain of 1452 m. The average gradient of 8.11% is punishing on its own, but the headline figure hides sharper truth: pitches reach 17.05%, more than double the mean. This is a long, sustained effort with real teeth, the kind of climb that rewards patience early and punishes anyone who spends too freely.

How the Gradient Unfolds

An 8.11% average across nearly 18 km is already a serious commitment, but the shape matters as much as the mean. With a maximum of 17.05% against an 8.11% average, the climb is not evenly paved — there are ramps roughly twice as steep as the overall figure, which means there must also be gentler stretches that pull the average back down. Expect the road to swing between merciful and brutal rather than settling into one steady rhythm.

The total ascent of 1419 m sits just below the 1452 m net gain, telling you the climb runs almost entirely uphill with very little relief or descending along the way. Once you start climbing, you keep climbing. Read the steepest pitches early so they never catch you cold, and treat every easing of the gradient as a chance to recover rather than to attack.

Pacing Notes

On a climb this long, pacing is everything. The full 17.9 km at 8.11% will take most riders well over an hour, so this is a threshold-and-below effort, not a series of sprints. Anchor your pace to your FTP and hold something in reserve for the 17.05% ramps, where power spikes are unavoidable and staying seated becomes difficult.

If you do not know your threshold number, estimate it before you commit to a pacing target with the FTP estimator. Aim to ride the shallower sections a touch below threshold so you have headroom when the road kicks up. The single biggest mistake on a 1452 m ascent is going too hard in the first few kilometres — bank patience, not fatigue.

Gearing

Do not undergear this one. With sustained 8.11% grades and ramps to 17.05%, you want the widest range you can fit. A compact 34-tooth inner ring paired with a 34×32 cassette is a sensible baseline for strong climbers, giving a near 1:1 low that lets you spin rather than grind. For most riders, and for anyone tackling this at the end of a long day, step down to 34×34 — the extra sprocket is worth its weight every time the gradient touches double digits. Klausenpass is far too long to muscle in a big gear, so err toward easier ratios and protect your legs across all 17.9 km.

Summary

Klausenpass is a benchmark HC climb: long, steep, and relentlessly uphill, with 1452 m of net gain packed into 17.9 km and ramps that hit 17.05%. Pace it below threshold, gear it generously, and respect the distance.

Length: 17.9 km
Average gradient: 8.11%
Max gradient: 17.05%
Start: 504 m
Summit: 1956 m
Net gain: 1452 m
Total ascent: 1419 m
Category: HC