Alto del sapo

Overview

Alto del sapo is a short, honest climb that rewards steady effort over drama. At just 1.7 km long with an average gradient of 4.54%, it sits firmly in category 4 territory — the gentlest of the classified tiers, but by no means a throwaway. The road lifts from a start elevation of 551 m to a summit of 630 m, delivering 79 m of net elevation gain over its length. The total ascent registers slightly lower at 70 m, a reminder that even a compact climb has small undulations that trim a few metres from the pure vertical.

With a maximum gradient of 5.35%, the steepest ramp never strays far from the average. That narrow band between 4.54% and 5.35% is the defining feature here: consistency. There is no wall to fear and no false flat to lull you — just a sustained, manageable pitch from bottom to top.

How the Gradient Unfolds

The shape of Alto del sapo is refreshingly simple. Because the average of 4.54% and the maximum of 5.35% differ by less than a single percentage point, the climb behaves almost like a fixed incline. You settle into a rhythm early and hold it. Expect the gradient to sit around the mid-4% range through most of the 1.7 km, nudging toward its 5.35% peak on the firmest sections before easing back.

Over such a short distance, the 79 m of net gain arrives quickly. The gap between that net figure and the 70 m of total ascent tells you the road gives back a little along the way — a shallow dip or two that briefly relaxes the pitch. These are recovery beats, not obstacles.

Pacing Notes

On a climb this brief, pacing is about control, not conservation. You will crest the 630 m summit long before glycogen becomes a concern, so the temptation is to attack. Resist over-cooking the opening. Aim to hold an even effort just under or right at your threshold — a good target is your FTP or a touch below, since the whole ascent can be ridden as a single sustained push.

If you are unsure where your threshold sits, run the numbers through the FTP estimator before you plan your effort. With only 79 m of gain to manage, a steady tempo that respects the 4.54% average will carry you over faster than a series of surges and fades.

Gearing

Gearing for Alto del sapo is forgiving. With a maximum gradient of 5.35% and an average of 4.54%, most riders on a standard compact setup will have plenty in reserve. A 34×32 will comfortably handle the entire 1.7 km, letting you spin the steepest 5.35% ramp without grinding.

If you prefer to keep cadence high or you are climbing on tired legs, a 34×34 adds a little extra headroom and turns the summit into a pure rhythm exercise. Either ratio is more than adequate for a category 4 effort — the goal is smoothness, not survival, so pick the cassette that keeps your legs turning freely.

Summary

Alto del sapo is a tidy, low-stress climb: 1.7 km of consistent gradient that rarely deviates from its 4.54% average, capped by a mild 5.35% maximum. From 551 m to 630 m, it delivers 79 m of net gain in a single steady push — ideal for tempo work or a warm-up before something harder.

Length: 1.7 km
Average gradient: 4.54%
Max gradient: 5.35%
Start: 551 m
Summit: 630 m
Net gain: 79 m
Total ascent: 70 m
Category: 4