Hochgräntenjoch

Overview

Hochgräntenjoch is a hors catégorie ascent, the hardest classification on the scale, and the numbers explain why. It runs 12.5 km from a start elevation of 1210 m to a summit at 2431 m, a net gain of 1221 m. The average gradient of 9.76% is not a figure softened by flat run-ins or false flats — it is a relentless mean, sustained across the full length. With a total ascent of 1205 m packed into those 12.5 km, this is a climb that asks a single question over and over: can you hold your effort when the road refuses to ease?

How the Gradient Unfolds

The defining feature here is consistency of severity. An average of 9.76% over 12.5 km means there is very little respite — the climb sits in the punishing band from bottom to top rather than concentrating its difficulty into one showpiece ramp. The maximum gradient of 29.53% is the standout statistic, a pitch steep enough that momentum, body position and gear selection all matter more than raw power. Because the summit stands at 2431 m, the closing kilometres also carry the additional load of thinning air, so any section that reads as merely "average" near the top will feel harder than the same slope near the 1210 m base. Expect the shape to be a long, grinding wall punctuated by the 29.53% spike — treat that maximum as a section to survive, not attack.

Pacing Notes

On a climb this uniform, pacing is everything. Your target should be an effort you can hold for the better part of an hour, which means riding close to but under your FTP rather than surging. The 29.53% maximum will force a spike above threshold no matter how disciplined you are, so bank a small buffer beforehand and let your heart rate settle again once the pitch relents. If you do not know your threshold number, run the figures through the FTP estimator first, then set a ceiling and refuse to break it in the opening kilometres — the 9.76% average punishes anyone who starts hot. The altitude gain to 2431 m compounds early mistakes, so ride the first half conservatively and keep something for the top.

Gearing

Do not under-gear this one. With a 9.76% average and a 29.53% maximum, a compact chainset paired with a wide-range cassette is the sensible baseline. A 34×32 will get many strong riders up the sustained sections, but the steepest pitches leave little margin, so a 34×34 is the wiser choice for most — it lets you spin rather than grind, protecting your legs across the full 12.5 km and the 1205 m of total ascent. If your setup allows an even easier bailout gear, the summit at 2431 m makes it worth having.

Summary

Hochgräntenjoch is a pure test of sustained climbing: long, uniformly steep, and topped by an altitude that magnifies every watt. Respect the average, gear low, pace to threshold, and treat the 29.53% ramp as a moment to survive.

Length: 12.5 km
Average gradient: 9.76%
Max gradient: 29.53%
Start: 1210 m
Summit: 2431 m
Net gain: 1221 m
Total ascent: 1205 m
Category: HC