Alto de Piedrablanca

Overview

Alto de Piedrablanca is a category 1 climb that stretches 12.7 km from a valley floor at 268 m up to a summit of 1022 m. That is a net gain of 754 m at an average gradient of 5.92%, with the steepest pitch touching 9.11%. It is long enough to demand real patience and steep enough that you cannot simply muscle over the top. The category 1 rating sits just below hors catégorie, so treat this as a serious effort rather than a rolling drag.

How the Gradient Unfolds

Over 12.7 km the road gains 754 m in net elevation while total ascent tallies 744 m, meaning the profile is almost relentlessly upward with only the smallest concessions of false flat or brief respite. A 5.92% average across that distance is deceptively honest: because the mean sits near 6% and the maximum reaches 9.11%, the harder ramps are only a few points above the sustained pitch rather than isolated spikes. Expect the gradient to hover around its average for long stretches, then stiffen toward 9% on the pinch points. There is no single monster wall to survive; instead the difficulty is cumulative, built from kilometre after kilometre of steady resistance.

Pacing Notes

The key to Piedrablanca is metering your effort against the clock, not the road. Because the climb is long and even, ride it just under your threshold rather than surging on every rise. Anchor your pacing to your FTP: holding a percentage of that power keeps you from detonating on the 9.11% ramps that arrive late, when fatigue is already stacked. If you do not know your number, run the FTP estimator before you go, then aim to sit a touch below it on the sustained 5.92% sections and allow yourself to drift above only briefly on the steepest pitches. With 754 m to gain, discipline in the first half pays back handsomely in the last few kilometres.

Gearing

For a 12.7 km climb averaging 5.92% with ramps to 9.11%, gear for the long haul rather than the flats. A compact 34-tooth inner chainring is the sensible foundation. Pair it with a 34×32 for the sustained middle of the climb, and if you spin a lower cadence or carry any extra load, step up to a 34×34 to keep your legs turning over on the steepest pitches without grinding. The extra range of the 34×34 is cheap insurance on a climb where the difficulty is measured in duration as much as steepness. Better to have one gear in reserve than to be over-geared near the 1022 m summit.

Summary

Alto de Piedrablanca rewards riders who pace with their head and gear for endurance. Its 754 m of net gain over 12.7 km, capped by ramps of 9.11%, make it a proper category 1 test that punishes early enthusiasm and repays patience all the way to the top.

Length: 12.7 km
Average gradient: 5.92%
Max gradient: 9.11%
Start: 268 m
Summit: 1022 m
Net gain: 754 m
Total ascent: 744 m
Category: 1