Atsunta Pass

Atsunta Pass cycling climb profile

Atsunta Pass is not a climb that lets the numbers hide the difficulty. At 17.8 km with an average gradient of 9.13 percent, it sits firmly in HC territory, and the scale is reinforced by the elevation change: the road starts at 1190 m and finishes at 2819 m, for a net gain of 1629 m.

The practical takeaway is simple: this is a long, steep climb where the average gradient is already high enough to shape the entire ride. A 9.13 percent average over 17.8 km means the default effort is climbing under load, not waiting for one decisive steep sector. Add a maximum gradient of 19.2 percent, and the risk is not just muscular fatigue, but repeated torque spikes if the gearing is too ambitious or the pacing is too close to the limit.

How the gradient unfolds

The supplied profile does not break the climb into lower, middle, and upper sectors, so the cleanest reading is the most useful one: from bottom to summit, Atsunta Pass asks for sustained steep climbing, with at least one ramp reaching 19.2 percent. That matters because the average is not being propped up by a short wall on an otherwise moderate road. The full-climb number is severe on its own.

Starting at 1190 m, the climb gains steadily toward 2819 m. Even without segment-level detail, the combination of length, gradient, and summit elevation tells you how to ride it. The lower slopes should feel deliberately controlled, because the cost of going too hard early compounds quickly on a climb this long. By the upper part, the effort is no longer just about power - it is about keeping cadence, traction, breathing, and fueling aligned while the gradient continues to demand real torque.

Pacing and gearing notes

Treat Atsunta Pass as a threshold-management climb, not a place to chase speed early. If you know your /glossary/ftp, the opening should sit below the effort you think you can hold for the whole climb, because the 19.2 percent maximum gradient will force higher-power moments whether you want them or not.

Gearing should be conservative. The average gradient is steep enough that a climbing cassette is not a luxury, and the maximum gradient makes low-end gearing especially important. The goal is to preserve cadence on the hardest pitches rather than grind through them and pay for it later.

A good approach:

• Start below target intensity and let the climb come to you.
• Keep cadence sustainable before the steepest ramps arrive.
• Avoid standing surges unless they are used briefly to reset position.
• Fuel early, because 17.8 km at this gradient gives little natural recovery.
• Save the deepest effort for the final section, not the first steep pitch.

Atsunta Pass is difficult because the whole climb is difficult. The 19.2 percent maximum is the warning sign, but the 9.13 percent average over 17.8 km is the real story.