A Portela do Manzón

Overview

A Portela do Manzón is a category 2 climb that stretches 10.2 km from a start elevation of 602 m to a summit at 1090 m. That works out to a net elevation gain of 488 m, with a recorded total ascent of 476 m once you account for the small dips and false flats along the way. The average gradient sits at 4.81%, and the road never pitches beyond a max gradient of 7.51%. This is a long, honest climb rather than a wall — the kind of ascent that rewards rhythm over raw power. At better than ten kilometres in length, it asks for patience, and its moderate slopes mean the effort is measured in minutes of sustained tempo rather than short, brutal accelerations.

How the Gradient Unfolds

The defining feature here is consistency. With an average of 4.81% and a ceiling of 7.51%, the difference between the typical slope and the steepest ramp is only about 2.7 percentage points. That narrow band tells you the road holds a fairly even pitch for most of its 10.2 km. There are no lung-searing double-digit sections to survive, but there is also nowhere to truly recover — the gradient keeps working against you almost continuously. The gap between the 488 m net gain and the 476 m total ascent is small, which confirms the climb rises steadily without significant descending in the middle. Expect the steeper stretches near 7.51% to appear in bursts, bracketed by long passages hovering around the average.

Pacing Notes

On a climb this even, pacing is everything. Because the gradient rarely spikes, you can hold a near-constant power output from the 602 m base to the 1090 m summit. Aim to ride just below your threshold — think of your FTP as the ceiling you tap but do not shatter early. Over 10.2 km, going into the red in the first few kilometres will cost you dearly in the back half. If you are not sure where your sustainable number sits, run the numbers through the FTP estimator before you commit to a pace. Settle in, breathe, and let the 4.81% average dictate a repeatable cadence you can defend all the way to the top.

Gearing

For a 488 m ascent at 4.81% with pitches touching 7.51%, most riders will be comfortable on a compact setup. A 34×32 gives you enough range to spin the steeper ramps without grinding, and it keeps your cadence high across the sustained middle section. If you carry extra fatigue, load a heavier bike, or simply prefer to protect your knees on a climb of this length, step up to a 34×34 for a little more insurance on the 7.51% pinches. Neither is overkill here — the goal is to keep your legs turning smoothly for all 10.2 km rather than muscling a big gear.

Summary

A Portela do Manzón is a steady, category 2 test that rewards a measured effort over its full 10.2 km. Even gradients, a modest maximum, and a clean 488 m of net gain make it an ideal climb for practising disciplined pacing.

Length: 10.2 km
Average gradient: 4.81%
Max gradient: 7.51%
Start: 602 m
Summit: 1090 m
Net gain: 488 m
Total ascent: 476 m
Category: 2