Paso de Pircas Negras

Paso de Pircas Negras cycling climb profile

Paso de Pircas Negras is a category 1 climb in Chile that asks a simple but uncomfortable question: can you keep producing steady climbing power while already starting at 3,300 m and finishing at 4,248 m?

On paper, the 18 km length and 5.26% average gradient suggest a controlled, tempo-style ascent rather than a wall. The harder detail is where that work happens. This is not a climb that begins low and lets you settle in before altitude becomes a factor. The first pedal strokes are already high, and the road gains 948 m by the summit. That means the pacing problem is less about surviving one savage section and more about not letting a manageable gradient become expensive through poor intensity control.

How the gradient rides

The average gradient of 5.26% points to a climb that should mostly feel rideable in rhythm. For a well-paced rider, this is the type of ascent where the temptation is to sit just above sustainable effort because the road rarely looks brutally steep. That is the trap.

With a maximum gradient of 9.34%, Paso de Pircas Negras has enough bite to punish overgearing and early enthusiasm. The steepest ramps are not extreme by pure gradient, but on an 18 km climb that starts at 3,300 m, they arrive inside an already costly effort. If you are riding by power, the right approach is to cap the surges rather than chase speed across every ramp. If you are riding by feel, keep the first half deliberately contained and treat any steeper pitch as something to absorb, not attack.

Pacing and gearing notes

This is a climb for steady torque management, not repeated accelerations. A good target is a controlled endurance-to-threshold progression, depending on your level and objective. Riders using /glossary/ftp should avoid letting the early gradient lure them into a number they could hold at lower elevation but cannot defend all the way to 4,248 m.

Gearing should be chosen for cadence preservation on gradients approaching 9.34%. The average may be moderate, but the summit elevation and 18 km duration make grinding a poor trade. Use a low enough climbing gear that the steeper ramps can be ridden seated without forcing muscular strain too early.

The cleanest way to ride Paso de Pircas Negras is conservative early, stable through the middle, and only more assertive once the summit is genuinely close. The profile rewards discipline because the climb is long enough, high enough, and steep enough in places to expose any pacing mistake.