Alto de Tala

Overview

Alto de Tala is a hors catégorie climb in Peru that trades ferocity for sheer relentlessness. Over 45 km it lifts you from a start elevation of 1644 m to a summit of 3666 m, a net gain of 2022 m and a total ascent of 2043 m once the rolling sections are counted. The average gradient is a deceptively modest 4.5%, but at this length that number is a warning rather than a comfort: there is simply no bottom to the effort, and the thin air near the top magnifies every watt. With a maximum gradient of 12.51%, the climb also hides teeth sharp enough to blow apart anyone who arrives at the steepest ramps already deep in the red.

How the Gradient Unfolds

Read the numbers as a shape. A 4.5% average across 45 km means the road never truly flattens and never truly wall-ramps for long — instead it stacks kilometre after kilometre of steady, grinding drag. The gap between the 12.51% max and the 4.5% average tells you the climb is uneven: expect stretches well below average that let you recover, punctuated by pitches that surge past 12% and force a hard change of rhythm. Because the total ascent (2043 m) exceeds the net gain (2022 m) by only a small margin, there is very little descending or false-flat relief mixed in — almost everything you climb, you keep. That 2022 m of net vertical, gained continuously, is the defining challenge.

Pacing Notes

On a climb this long, discipline beats bravado. Anchor your effort to your FTP: for the 45 km bulk sitting near the 4.5% average, hold a sustainable tempo below threshold so you have something left for the 12.51% ramps, where a brief surge is unavoidable. If you do not know your threshold, the FTP estimator will give you a working number to plan around. Remember that the summit sits at 3666 m — altitude will quietly shave your usable power in the final kilometres, so treat any effort near threshold in the closing stretch as more costly than it feels. Pace the first two-thirds conservatively and you buy yourself the legs to survive the top.

Gearing

Gear for the length, not just the max. The 4.5% average is spinnable, but 45 km of it plus 12.51% pitches at over 3000 m demand a generous bailout. A compact 34-tooth inner paired with a wide cassette is the sensible baseline: a 34×32 handles most of the sustained drag comfortably, while a 34×34 gives you the extra spin to keep cadence up on the steepest ramps without grinding your legs into the ground. If you tend to fade late, err toward the 34×34 — the summit altitude makes an easy gear worth its weight.

Summary

Alto de Tala is an endurance test disguised by a gentle average: 45 km, 2022 m of net climbing, and a summit high enough to change how your body works. Pace it patiently, gear it generously, and respect the length.

Length: 45 km
Average gradient: 4.5%
Max gradient: 12.51%
Start: 1644 m
Summit: 3666 m
Net gain: 2022 m
Total ascent: 2043 m
Category: HC