Pircas Negras Pass

Pircas Negras Pass cycling climb profile

Pircas Negras Pass is a long Category 1 climb that asks for restraint more than aggression. On paper, 25.2 km at 4.26% can look manageable, but the key number is where it happens: the road starts at 3172 m and tops out at 4244 m. That altitude changes the ride. A pace that feels sustainable early can become expensive once the climb has quietly accumulated more than a vertical kilometre of gain.

The total shape is not defined by a brutal average gradient. It is defined by duration, elevation, and the risk of underestimating the steeper moments. With a maximum gradient of 9.29%, the climb has enough bite to force real gear choices, even if the overall average suggests a steadier ascent.

How the gradient unfolds

From the bottom, the climb gains 1072 m over 25.2 km, so the dominant character is a long, persistent uphill rather than a short punchy test. The 4.26% average points to a climb where much of the work is aerobic and tempo-based, but that number should not be read as permission to ride it casually.

The reason is simple: a climb this long gives small pacing errors plenty of time to compound. If the early slopes feel comfortable, the right move is not to chase speed. It is to lock into a sustainable output and let the climb come to you. The 9.29% maximum gradient means there are steeper ramps somewhere in the profile, and those ramps are where riders who have been riding above themselves will start paying interest.

Because the available profile data does not identify where those steepest sections sit, the safest assumption is tactical rather than geographical: ride the lower part as if the hardest ramp is still ahead, then only lift the effort once the summit is realistically within reach.

Pacing and gearing notes

Use a conservative climbing target, especially if you normally benchmark efforts from /glossary/ftp. At this elevation range, perceived effort can drift upward even when power stays controlled. That makes heart rate, breathing, and cadence useful checks against over-riding the first half.

For gearing, do not be fooled by the average. A low climbing gear is still the correct choice because the maximum gradient reaches 9.29% and the climb lasts 25.2 km. The goal is to keep cadence from collapsing on the steeper ramps without spiking effort above threshold.

A practical approach:

• Start below your normal long-climb intensity and let the first kilometres settle.
• Keep cadence smooth on the moderate gradients rather than forcing a bigger gear.
• Treat any steep ramp as a place to limit losses, not attack the climb.
• Save the strongest sustained effort for the final portion, once the altitude and duration are already priced in.

Pircas Negras Pass is not defined by one savage statistic. It is a long, high-altitude climb where the average gradient hides the real challenge: staying efficient for 25.2 km while still having the legs and gearing to handle the ramps that reach 9.29%.