Alto del Tamá

Overview

Alto del Tamá is a hors catégorie climb that packs a brutal amount of vertical into a short distance. Over just 8 km it averages 12.05%, dragging you from a start elevation of 1131 m up to a 2094 m summit. That is a net gain of 963 m across barely eight kilometres — the kind of ratio that separates HC ascents from the merely hard. There is no rolling introduction and no false flat to hide behind: the average gradient tells the whole story, and the story is steep.

How the Gradient Unfolds

With a 12.05% average and a 17.36% maximum, the shape of this climb is defined by how tightly those two numbers sit together. The gap between average and max is only a little over five percentage points, which means the steepest ramps are not wild outliers spiking off an easy road — they are simply the hardest moments of a road that is uniformly severe. When almost every metre hovers near 12%, the 17.36% pitches feel less like a wall appearing out of nowhere and more like the climb briefly showing its teeth. Expect to spend the entire ascent in a low gear, grinding, with the total ascent of 923 m concentrated into an unforgiving 8 km.

Pacing Notes

On a climb this steep, pacing is survival. The single most useful reference is your FTP — your functional threshold power. On sustained 12% terrain there is nowhere to soft-pedal and recover, so the temptation to overcook the opening kilometre is dangerous. Settle just under threshold early and hold it, because the gradient never relents enough to let you claw back a blow-up. If you do not know your number, run the FTP estimator before you commit to a target and pace to a wattage you can actually hold for the roughly 8 km duration. Watch the ramps toward 17.36% — let cadence drop rather than surging power, and let your effort, not the road, dictate the tempo.

Gearing

Gear for the steepest sustained sections, not the average, and definitely not the flat. On a climb averaging 12.05% with pitches to 17.36%, most riders will want the biggest cassette they can fit. A 34×32 is the practical minimum here, and even strong climbers will be pushing it hard on the steeper ramps at that ratio. If your rear derailleur and budget allow, step up to a 34×34 — that extra sprocket buys you meaningful cadence relief across a 963 m gain and keeps your knees intact on the 17.36% pitches. When in doubt on a HC climb like this, choose the easier gear; you will never regret the spare teeth.

Summary

Alto del Tamá is a short, savage HC test where the average gradient is nearly as punishing as the maximum. Pace to your threshold, gear low, and respect the fact that all 963 m of climbing arrive in one concentrated 8 km hit.

Length: 8 km
Average gradient: 12.05%
Max gradient: 17.36%
Start: 1131 m
Summit: 2094 m
Net gain: 963 m
Total ascent: 923 m
Category: HC