Puerto de San Miguel

Overview

Puerto de San Miguel is a short, uncompromising category 2 climb that packs a heavy punch into just 4.6 km. From a start elevation of 493 m it hauls you up to a summit of 878 m, a net gain of 385 m over a distance that leaves nowhere to hide. The headline number is the average gradient: 8.35%. That figure is not softened by flat approaches or false flats — it is a consistent, grinding pitch that asks the same hard question from the base to the top. With a maximum gradient of 12.5%, there are moments where the road steepens beyond what your rhythm wants to allow, forcing a decision between holding cadence or shifting down and spinning through.

How the Gradient Unfolds

The shape of Puerto de San Miguel is honest and brutal in equal measure. Over 4.6 km the climb delivers 372 m of total ascent, and because that ascent is so tightly compressed, the gradient rarely relents. An 8.35% average across nearly the entire length means you can expect long stretches sitting right around that figure, punctuated by ramps that rise toward the 12.5% maximum. There is no dramatic plateau in the middle to recover on — the climb trends relentlessly upward from 493 m to 878 m. The difference between the net elevation gain of 385 m and the total ascent of 372 m tells you this is a climb that essentially only goes one way: up. Expect the steepest ramps to arrive as sharp increases over an already-demanding baseline, so read the road ahead and brace for the pitches rather than reacting to them.

Pacing Notes

On a climb this steep and this short, pacing is everything. The temptation is to attack the lower slopes, but at 8.35% average the climb will punish an over-eager start long before the 878 m summit. Anchor your effort to your FTP and aim to hold a steady, sustainable power through the consistent middle before the ramps toward 12.5% force a surge. If you don't know your threshold, run the numbers through the FTP estimator and set a target you can actually hold for the full 4.6 km. On the steepest pitches, let power drift slightly above threshold rather than blowing your cadence apart — then settle back onto your rhythm as the gradient eases back toward the average.

Gearing

Do not under-gear this one. With an 8.35% average and 12.5% ramps over 4.6 km, a compact chainring paired with a wide-range cassette is the sensible baseline. A 34×32 will get most fit riders over the top, but it leaves little margin when the road tips toward its maximum. If you want to protect your legs and keep a smoother cadence on the steepest sections, a 34×34 is the smarter choice — the extra range keeps you spinning rather than grinding through the 385 m of climbing.

Summary

Puerto de San Miguel is a compact, category 2 test: short enough to attack, steep enough to respect. Pace it off your threshold, gear it generously, and let the numbers guide your effort.

Length: 4.6 km
Average gradient: 8.35%
Max gradient: 12.5%
Start: 493 m
Summit: 878 m
Net gain: 385 m
Total ascent: 372 m
Category: 2