Alto de Los Lucios

Overview

Alto de Los Lucios is a genuine hors catégorie test, the kind of climb that reorders your day around it. Over just 6.2 km it drags you from a start elevation of 1391 m up to a 2247 m summit, a net gain of 856 m. That is a brutal density of vertical for the distance, and the 13.78% average gradient tells you why: there is almost nowhere to hide. The total ascent registers at 823 m, marginally less than the net figure, which is the signature of a climb that only ever points up — no rolling recovery, no false descents to reset your legs. When a slope holds an average this steep, the numbers stop being trivia and become the whole story. This is a wall dressed up as a road.

How the Gradient Unfolds

The defining feature of Los Lucios is that its 13.78% mean is not built from a few savage spikes bracketing easy ground. To average that steep across 6.2 km, the road has to stay uncomfortably steep almost continuously. The 24.8% maximum marks the cruelest pitch — more than eleven points above the average — so expect at least one ramp that forces you out of the saddle or down to your final sprocket. But the real difficulty is what surrounds that spike: long stretches parked in the low-to-mid teens that never grant the gradient relief your legs keep begging for. Climb the whole thing and you accumulate 823 m of ascent packed into a distance most riders would cover in a gentle warm-up elsewhere.

Pacing Notes

On a climb this steep, pacing is survival. The temptation is to attack the lower slopes, but with 6.2 km and 856 m of gain ahead, going into the red early is a one-way ticket to a walk. Ride to your sustainable ceiling and hold it. Your FTP is the number that matters here — knowing the wattage you can hold for a sustained effort lets you meter the 13.78% average without blowing apart on the 24.8% ramp. If you do not have a recent figure, run the numbers through the FTP estimator before you commit to this one. Treat the steepest pitch as a brief overshoot to absorb, not a place to race, and settle back to your target the moment the slope eases.

Gearing

Do not under-gear this climb. At a 13.78% average with a 24.8% maximum, you want the widest range you can bolt on. A compact 34-tooth chainring paired with a 34×32 cassette is the sensible floor for strong climbers, but most riders will be far happier with a 34×34, and nobody has ever regretted an easier gear on a slope like this. The extra sprocket keeps your cadence alive through the steepest metres and protects your knees across the full 6.2 km. If your bike accepts anything larger than 34 at the back, use it — the summit at 2247 m rewards spinning over grinding.

Summary

Alto de Los Lucios is short in kilometres and enormous in effort: 6.2 km, 856 m of net gain, and an average that rarely relents. Pace it honestly, gear it generously, and respect the numbers.

Length: 6.2 km
Average gradient: 13.78%
Max gradient: 24.8%
Start: 1391 m
Summit: 2247 m
Net gain: 856 m
Total ascent: 823 m
Category: HC