Alto de Durí

Alto de Durí cycling climb profile

Alto de Durí is a Category 1 climb where the main difficulty is duration rather than a single decisive ramp. The headline numbers set the tone: 26 km at an average gradient of 4.77%, rising from 1,209 m to 2,448 m, with 1,239 m of net elevation gain.

That combination matters. A sub-5% average can look manageable on paper, but spread across 26 km it becomes a long aerobic test. This is not a climb to attack like a short wall. The cost comes from holding pressure on the pedals for a long time while gradually accumulating altitude.

How the gradient unfolds

The available profile points to a climb that gains altitude consistently. Total ascent is 1,262 m against 1,239 m of net elevation gain, which means nearly all the climbing you do is converted into height gained. In practical terms, there is not much statistical evidence of meaningful downhill recovery. Even if the road eases at times, the climb keeps trending upward.

The average gradient of 4.77% suggests much of Alto de Durí should feel tempo-controlled rather than brutally steep. But the maximum gradient of 10.12% changes how it should be paced. Any double-digit section on a climb this long can force a rider above threshold if they arrive overgeared or already fatigued. The danger is not the 10.12% itself - it is hitting that pitch after a long block of steady climbing.

Pacing strategy

The smart approach is to treat Alto de Durí as a sustained endurance climb with threshold risk, not as a pure power climb. Start below the effort you think you can hold. On a 26 km ascent, the early kilometers should feel controlled enough that cadence stays smooth and breathing remains stable.

Use the average gradient as a guide, but respect the maximum gradient. If you pace only for 4.77%, the steeper sections can become costly. The better strategy is to leave enough room to absorb the ramps without spiking far above your sustainable climbing power. Riders using FTP or a power target should avoid chasing speed on the easier gradients if that means arriving at the steeper pitches with no margin.

Gearing notes

Bring gearing that lets you stay seated and keep cadence under control when the road reaches its steepest point. Because the climb is long and tops out at a much higher elevation than it starts, muscular fatigue is likely to build before the summit. An easier gear is not just insurance for the 10.12% maximum - it helps protect the legs across the full 1,239 m of net gain.

For most riders, the fastest ride here will come from restraint: settle in, avoid early surges, and save the harder effort for the upper part of the climb when the accumulated ascent starts to matter most.