Los Machucos

Overview

Los Machucos is a Category 2 climb in northern Spain that earns its reputation not through sheer length but through brutality. At 13 km from base to summit, it covers 710 m of net elevation gain — but the total ascent of 1,453 m tells a more honest story. This climb does not go up cleanly. It pitches, relents, and pitches again, accumulating more than twice its net gain in actual vertical work. The average gradient of 5.48% is almost meaningless as a planning tool here.

Gradient Profile

The moderate average masks what actually happens on the road. Los Machucos reaches a maximum gradient of 26.6%, which places isolated ramps in the company of the steepest pitches found anywhere in professional road racing. These sections are not sustained at that extreme, but they arrive with enough force to shatter any pacing plan built around the average figure.

The total ascent of 1,453 m against a net gain of 710 m confirms that significant descending — or at minimum flat and downhill recovery — is embedded within the 13 km. Riders should expect the climb to cycle through phases: punishing ramps, brief recoveries, then more climbing. This accordion structure demands a different mental model than a clean, steady ascent like a typical alpine col.

Key gradient facts at a glance

• Length: 13 km
• Net elevation gain: 710 m
• Total ascent: 1,453 m
• Average gradient: 5.48%
• Maximum gradient: 26.6%
• Category: 2

Pacing Strategy

Do not pace Los Machucos by average gradient. Riding to 5.48% effort from the bottom will leave you catastrophically under-geared and over-committed when the steep ramps arrive.

The correct approach is to treat this as a variable-intensity climb with discrete hard sections:

1. Ride the moderate sections at a controlled, sub-threshold effort. Use them to recover, not to make time. The total ascent figure confirms there is meaningful descending woven in — treat those stretches as full recoveries.
2. Anticipate the steep ramps rather than react to them. When you see the road kick up toward gradients north of 20%, shift down early. Trying to force a too-large gear at 25%+ is a fast way to blow up before the summit.
3. Use FTP as your anchor. On the hardest pitches, going significantly above threshold for a short duration is unavoidable — but you need to know your ceiling. If you haven't tested recently, the FTP estimator can give you a working number before you arrive.

Gearing

A compact chainset (50/34) is not a luxury here — it is close to mandatory for most riders. On a 26.6% maximum gradient, even a compact paired with an 11-32 cassette will have you at or near your lowest gear. Riders on a standard 53/39 setup will face a genuine risk of having to unclip on the steepest pitches unless they are strong climbers carrying low body weight.

If you are riding this on a bike with electronic shifting, pre-programme your preferred climbing mode before you start. Manual adjustments under extreme gradient load are slower and costlier than they look on flat ground.

What to Expect Overall

Los Machucos rewards patience and punishes ambition. The start elevation of 167 m rising to a summit at 877 m gives a clean headline number, but the 1,453 m of total ascent is the figure that will determine how your legs feel in the final kilometres. Budget for more physiological cost than a simple net gain calculation suggests, keep your hardest efforts for the steep ramps rather than the flats between them, and choose gearing that gives you genuine options when the road tilts past 20%.