Hahntennjoch

Overview

Hahntennjoch is a hors catégorie ascent that asks a serious question of any rider who points a wheel uphill. Over 16.3 km it climbs from a valley floor at 713 m to a summit of 1894 m, a net gain of 1181 m at an average gradient of 7.26%. That average is not a soft one. A climb that holds better than seven percent for the better part of an hour leaves almost nowhere to recover, and the 15.01% maximum gradient means there are ramps that spike well above the number your legs settle into. With a total ascent of 1169 m recorded across its length, this is a climb defined by sustained, honest difficulty rather than a single feature.

How the Gradient Unfolds

The shape here matters more than any single statistic. An average of 7.26% across 16.3 km implies a climb with very little dead ground — the elevation profile rises steadily rather than in isolated bursts. The gap between the 7.26% average and the 15.01% maximum tells you the story: expect stretches that sit near or above the average, punctuated by pitches that roughly double it. Those steepest ramps are where riders lose composure, spike their heart rate, and pay for it on the sections that follow. Because the net gain of 1181 m sits just above the total ascent of 1169 m, there is essentially no descending relief built into the climb — once you start, the road keeps going up until the 1894 m summit.

Pacing Notes

The single biggest mistake on a climb like this is going out too hard on the lower slopes and detonating before the halfway mark. With 16.3 km to cover, treat your effort as a long, controlled burn anchored to your FTP. A sensible target for most riders is to sit just below threshold on the average-gradient sections and let power rise only briefly over the 15.01% ramps, then settle again. If you do not know your threshold number, estimate it first with the FTP estimator so your pacing is built on data rather than optimism. Meter the steep pitches: the goal is to crest each ramp without a surge that borrows energy you cannot repay across the remaining kilometres.

Gearing

An HC climb averaging 7.26% with maximums touching 15.01% demands generous gearing. A compact 34-tooth inner chainring paired with a wide cassette is the baseline. A 34×32 will get most trained riders over the top, but on the steepest ramps and after 16.3 km of accumulated fatigue you will be grinding. If your legs are anything short of race-fresh, fit a 34×34 — the extra sprocket keeps your cadence in a sustainable range on the 15.01% pitches and protects your knees over 1181 m of climbing. When in doubt, err toward the easier ratio.

Summary

Hahntennjoch is a full-value HC test: long, steep, and unrelenting, with no hiding place across its 16.3 km. Respect the average, prepare for the 15.01% ramps, gear low, and pace to your threshold.

Length: 16.3 km
Average gradient: 7.26%
Max gradient: 15.01%
Start: 713 m
Summit: 1894 m
Net gain: 1181 m
Total ascent: 1169 m
Category: HC