Paso de Mondaca

Paso de Mondaca cycling climb profile

Paso de Mondaca is not just long. It is structurally demanding. The climb runs for 46.1 km from 984 m to 3,838 m, gaining 2,854 m net and 2,907 m in total ascent. That small gap between net elevation gain and total ascent tells you the main story: this is overwhelmingly a one-direction effort. There is not much free elevation being handed back once you start climbing.

At an average gradient of 6.19%, Paso de Mondaca can look manageable on paper if you judge it like a normal mountain pass. That would be the wrong read. Over this distance, 6.19% is already a major endurance load, but the recorded maximum gradient of 32.71% changes the pacing problem completely. The average is not the difficulty. The difficulty is sustaining controlled work for a very long time while still having the torque and composure to handle severe ramps.

How the gradient rides

From bottom to summit, the numbers point to a climb that rewards restraint. A 46.1 km ascent with 2,854 m of net gain does not need long walls to break a rider. The cumulative load does that first. The 32.71% maximum then adds a second threat: short, very steep sections where cadence can collapse if you arrive over-geared or already riding above your sustainable ceiling.

Because the total ascent is only slightly higher than the net gain, expect the climb to feel persistently uphill rather than rhythmically broken by meaningful recovery. That matters tactically. On a climb with frequent descents or flat shelves, you can sometimes spend above threshold and recover naturally. Paso de Mondaca gives far less margin for that style. Every acceleration has to be paid for while the road is still rising.

The summit at 3,838 m also changes the way the climb should be ridden. Even if the lower slopes feel controlled, the upper part asks more from the same power output because the finish is high. The practical implication is simple: if the first half feels like a solid tempo day, you are probably riding it correctly. If it feels heroic early, it is likely too hard.

Pacing and gearing

Treat Paso de Mondaca as an HC endurance climb with explosive gradient risk, not as a steady 6.19% tempo climb.

Practical approach

• Start below your normal long-climb effort and let the ride come to you.
• Use /glossary/ftp as a ceiling, not a target, especially before the steepest gradients.
• Keep cadence protected early. Muscling a big gear for 46.1 km is a poor trade.
• Choose gearing for the 32.71% maximum, not the 6.19% average.
• Eat and drink before you feel the altitude and duration stacking up.

The cleanest pacing model is conservative and boring at the bottom, disciplined through the middle, and only more committed once the summit is genuinely close. Paso de Mondaca punishes riders who chase the average gradient and rewards those who respect the full profile: long distance, huge net gain, minimal relief, and at least one brutally steep pitch that can expose any mistake made earlier.