Alto El Bizcocho

Overview

Alto El Bizcocho is a hors catégorie (HC) climb that refuses to give you anything for free. Over 16.7 km the road rises from 1666 m to a summit of 3543 m, stacking up 1877 m of net elevation gain at a brutal average gradient of 11.24%. That average alone tells the story: this is not a climb with a hard middle and gentle bookends — it is steep from bottom to top, with a total ascent of 1842 m packed into a road that almost never lets the gradient drop into single digits for long.

How the Gradient Unfolds

The defining feature here is sustained severity. An 11.24% average over 16.7 km means the road holds a punishing pitch for its entire length, and the max gradient of 23.1% marks the moments where it turns genuinely savage. There is no rhythm section to hide in. Because the climb starts already high at 1666 m and tops out at 3543 m, the thinning air compounds the gradient — every ramp toward that 23.1% maximum feels steeper than the numbers alone suggest. Expect the road to pin you near or above the average for long stretches, with the steepest walls arriving as brief, breath-stealing kicks rather than a single crux.

Pacing Notes

On a climb this long and this steep, pacing discipline is everything. Anchor your effort to your FTP and resist the urge to chase the early ramps — with 16.7 km and 1877 m of climbing ahead, a single hard surge low down will cost you dearly near the 3543 m summit, where the altitude blunts your power. Aim to sit at or just below threshold and treat the 23.1% pitches as the only places you spend matches. If you do not know your threshold, run the numbers through the FTP estimator before your attempt so you can set realistic power targets for a climb where every watt over budget is borrowed against the final kilometres.

Gearing

Do not under-gear this one. With an 11.24% average and ramps to 23.1%, most riders will want the easiest cassette they can fit. A compact 34-tooth chainring paired with a 34×32 low gear is the sensible minimum, but on a climb this sustained many riders will be far happier with 34×34 to keep the cadence turning through the steepest sections. If your bike and derailleur can accommodate an even easier ratio, the 1877 m of climbing gives you every reason to use it. The goal is to spin, not grind — over 16.7 km at this gradient, a cadence that protects your legs is worth more than raw gearing pride.

Summary

Alto El Bizcocho is one of the hardest categories of climb there is: long, unrelentingly steep, and finishing in thin air above 3543 m. Respect the average, gear low, pace to your threshold, and it becomes a monumental day rather than a survival crawl.

Length: 16.7 km
Average gradient: 11.24%
Max gradient: 23.1%
Start: 1666 m
Summit: 3543 m
Net gain: 1877 m
Total ascent: 1842 m
Category: HC