Alto de Limatón

Overview

Alto de Limatón is a category-1 climb that trades explosive steepness for relentless duration. Over 40 km it lifts you from a start elevation of 1678 m to a summit at 3358 m, a net gain of 1680 m. The average gradient reads a modest 4.2%, but that number hides the real story: the road's total ascent is 2018 m, meaning there are false descents and dips along the way that you'll have to climb back out of. This is a mountain measured in hours, not minutes, and the thin air at the top only compounds the challenge of the distance.

How the Gradient Unfolds

The 4.2% average is deceptive. With 2018 m of total ascent spread across a net gain of 1680 m, roughly 338 m of the climb is spent recovering elevation lost to intermediate downhills. That means the sustained climbing sections are meaningfully steeper than the headline figure suggests. The defining feature is a maximum gradient of 15.75% — a wall that will spike your effort well beyond any steady-state rhythm. Expect a climb that undulates: long tempo stretches near the average, punctuated by short, sharp ramps that demand you get out of the saddle or drop into your lowest gear. Because the summit sits at 3358 m, the final kilometres deliver reduced power output from altitude on top of gravity.

Pacing Notes

On a climb this long, discipline wins. Treat the 40 km as a controlled tempo effort anchored to your FTP rather than chasing the steep ramps too hard. Sitting just under threshold on the sustained 4.2% sections leaves headroom to absorb the 15.75% pitches without blowing up. Because the summit is at 3358 m, your usable power will fade in the final stretch — build that decline into your plan and start conservatively. If you don't know your threshold, use the FTP estimator to set realistic targets before you commit to a pacing strategy for a full 1680 m of vertical.

Gearing

Bring climbing gears. For a 40 km effort topping out at 15.75%, a compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 will handle most of the sustained 4.2% grades comfortably, but the max-gradient ramps and the altitude at 3358 m make a strong case for a 34×34 as your bailout gear. The extra rear cog protects your knees over 1680 m of climbing and lets you spin rather than grind when the road kicks up. If your bike can accept an even wider range, take it — you will never regret an easier gear this high up.

Summary

Alto de Limatón is an endurance test: a long, category-1 ascent where the challenge is managing effort across 40 km and altitude rather than surviving a single brutal wall. Pace it to your threshold, gear low, and respect the thin air near the top.

Length: 40 km
Average gradient: 4.2%
Max gradient: 15.75%
Start: 1678 m
Summit: 3358 m
Net gain: 1680 m
Total ascent: 2018 m
Category: 1