Sarlriedl - Passo Serla

Overview

Sarlriedl - Passo Serla is a long, patient climb: 26.8 km of near-continuous ascending that lifts you from a valley floor at 916 m to a summit of 2289 m. That works out to 1373 m of net elevation gain at an average gradient of 5.13%, and the profile records 1335 m of total ascent — the near-identical figures tell you this is an honest climb, one that goes up and stays up rather than sawing between rises and dips. It carries a category-1 rating, the tier just below hors catégorie, which means it demands respect without being a wall-to-wall brute.

The defining trait here is length. At 26.8 km, this is a climb measured in the better part of an hour or more for most riders, so the challenge is less about surviving any single ramp and more about holding a sustainable effort deep into a long, high-altitude ceiling.

How the Gradient Unfolds

The math is your best guide to the shape. With 1373 m of net gain across 26.8 km, the road tilts up at 5.13% on average — a gradient that rewards rhythm rather than raw power. Because the total ascent of 1335 m sits so close to the net gain of 1373 m, there is essentially no rolling relief built into this climb: what you gain, you keep. There are no free-speed descents mid-climb to recover on.

Expect the effort to accumulate. Even a moderate-feeling 5.13% becomes taxing when it never lets up, and the top of the climb pushes past 2289 m, where thinner air makes the same wattage feel harder than it would lower down.

Pacing Notes

On a climb this long, pacing discipline is everything. Anchor your effort to your FTP and aim to ride the bulk of the 26.8 km just below threshold — a sustainable tempo that leaves margin for the final kilometres near 2289 m, where altitude quietly taxes your output. Going too deep early on a 26-plus-kilometre climb is the classic mistake; the average of 5.13% is forgiving enough that overcooking the first third will cost you far more than a conservative start ever will.

If you are not sure what your threshold is, run your recent numbers through the FTP estimator before you plan the ascent. Knowing that figure turns 1373 m of climbing from a guessing game into a paced, repeatable effort.

Gearing

For a 26.8 km climb averaging 5.13%, gear for endurance, not heroics. A compact chainset paired with a wide-range cassette is the sensible setup. A 34×32 will cover most riders comfortably on the steadier stretches, letting you spin a high cadence and protect your legs over the long haul.

Because the effort stacks up over 1373 m of gain and finishes above 2289 m — where fatigue and altitude bite together — consider dropping to a 34×34. That extra sprocket buys you a lower floor for the closing kilometres, when holding cadence matters most and grinding a big gear is exactly what you want to avoid.

Summary

Sarlriedl - Passo Serla is a true endurance climb: 26.8 km at 5.13%, delivering 1373 m of net gain up to a lofty 2289 m summit. Its consistency — total ascent of 1335 m almost matching the net gain — makes it a pure test of sustained pacing rather than explosive punch. Gear low, ride within yourself, and let the numbers do the work.

Length: 26.8 km
Average gradient: 5.13%
Max gradient: n/a
Start: 916 m
Summit: 2289 m
Net gain: 1373 m
Total ascent: 1335 m
Category: 1