Puerto de Pandetrave

Overview

Puerto de Pandetrave is a long, steady category-1 ascent that asks for patience more than raw power. Over 20 km the road lifts you from 457 m at the base to a summit of 1474 m, a net gain of 1017 m across a total ascent of 1016 m. The average gradient of 5.09% sits in that deceptive middle ground: gentle enough to look ridable at first glance, sustained enough to hollow you out if you start too hard. This is a tempo climb, and it rewards riders who treat all 20 km as a single, connected effort.

How the Gradient Unfolds

The headline number is 5.09%, but averages hide the shape of a climb. With a maximum gradient of 8.31%, Pandetrave carries ramps that bite well above the mean — roughly three points steeper than the average at their worst. Because the total ascent (1016 m) and net gain (1017 m) are effectively identical, the road climbs almost continuously with negligible descent, so there is very little free recovery. Expect long stretches sitting near or just above 5%, punctuated by pitches that drift toward 8.31%. The near-perfect match between net gain and total ascent tells you this is an honest, one-directional climb: what you gain, you keep.

Pacing Notes

On a climb this length, effort discipline decides everything. Anchor your pace to your sustainable threshold rather than the burn in your legs on the opening slopes. A useful target is to hold a wattage you can defend for the full 20 km — comfortably around your FTP, backing off slightly on the shallower sections and allowing a controlled lift over the 8.31% ramps rather than surging.

If you are not sure what number to ride to, start with a quick benchmark from the FTP estimator and use it to set a ceiling for the lower half. Riders who clip that ceiling in the first few kilometres almost always pay for it before the 1474 m summit. Ride the average, respect the maximum, and let the climb come to you.

Gearing

For a 20 km climb averaging 5.09% with pitches to 8.31%, prioritise a spread that lets you spin the steep sections rather than grind them. A compact 34-tooth inner chainring paired with a wide-range cassette is the sensible baseline. A 34×32 will cover most of the climb for stronger riders holding good cadence, but the smart insurance on the 8.31% ramps — especially deep into the effort near the top — is a 34×34. That extra sprocket keeps your cadence up and your knees happy across the final metres to 1474 m. If in doubt, take the easier gear; there is nothing to gain from turning a steady tempo climb into a low-cadence slog.

Summary

Puerto de Pandetrave is a classic sustained category-1 test: long, honest, and unforgiving of a rushed start. Meter your effort, gear low enough to spin the steep pitches, and the 1017 m of climbing will unspool at a rhythm you can hold to the summit.

Length: 20 km
Average gradient: 5.09%
Max gradient: 8.31%
Start: 457 m
Summit: 1474 m
Net gain: 1017 m
Total ascent: 1016 m
Category: 1