Alto de los Bolsones

Alto de los Bolsones cycling climb profile

Alto de los Bolsones is a category 3 climb that looks manageable on paper, but the headline average hides the main pacing problem. The climb is 9 km long, averages 3.93%, starts at 18 m, and tops out at 372 m after 354 m of net elevation gain.

That combination tells you the basic shape: this is not a high-gradient grind from bottom to summit. It is a moderate-length ascent where the road trends upward consistently rather than repeatedly giving elevation back. The total ascent is 359 m against 354 m of net gain, so almost everything you gain is retained. In practical terms, the climb should ride more like a sustained uphill drag with interruptions than a rolling approach road.

How the gradient unfolds

The defining number is the gap between the 3.93% average and the 12.68% maximum gradient. The average says most of the climb is rideable at a controlled rhythm. The maximum says there are sharper ramps capable of disrupting that rhythm if you arrive overgeared or already above your limit.

Without detailed split data, the safest reading is simple: do not pace this as a uniform sub-4% rise. From the bottom, the climb asks for restraint because the low average can encourage too much speed early. But the presence of a 12.68% maximum means the harder sections are likely where the damage is done. If you treat the opening as free speed and drift above sustainable power, the steepest pitches will force a costly correction.

The climb gains 354 m from a very low starting elevation, so the challenge is not altitude. It is execution. You need to carry momentum where the gradient is modest, then absorb the steep sections without turning them into repeated anaerobic efforts.

Pacing and gearing notes

Ride the first part below your ceiling, especially if you are using this as a timed effort. A steady tempo to low-threshold approach is more reliable than chasing speed on the easier gradient. If you know your /glossary/ftp, keep the effort controlled enough that the steepest ramps can be handled with a short lift rather than a full reset.

Gearing should be chosen for the maximum gradient, not the average. A setup that feels comfortable at 3.93% may feel too tall when the road reaches 12.68%. Leave yourself a true bailout gear so you can keep cadence under control on the ramps instead of grinding at low revs and spiking torque.

For a strong ride, think of Alto de los Bolsones as a climb of patience. The average gradient gives you room to settle in, but the steep maximum punishes sloppy pacing. Stay smooth on the lower-gradient sections, protect your cadence, and save the hard efforts for the ramps that actually require them.