Paso de Arthur

Paso de Arthur cycling climb profile

Paso de Arthur is a category 2 climb in NZ that asks for controlled climbing rather than one explosive effort. The headline numbers are 11.1 km at an average gradient of 5.05%, rising from 362 m to 921 m. That gives the climb enough length to punish early over-pacing, while the 12.32% maximum gradient makes it clear that the average is not the whole story.

What it is like to ride

On paper, 5.05% is manageable for a trained rider, but over 11.1 km it becomes a sustained aerobic test. The important detail is the gap between the average and the maximum gradient. A climb that averages just over 5% but reaches 12.32% is not a steady metronome effort from bottom to summit. It has steeper moments that will pull you above target power unless you deliberately leave margin.

That matters because the climb gains 559 m from start elevation to summit elevation, with the profile data listing 545 m of total ascent. Either way, the demand is clear: this is a long enough climb that repeated spikes into the steepest pitches can accumulate quickly. Riders who treat the opening as simply a moderate-grade road risk arriving at the upper slopes with too much lactate and not enough cadence.

Gradient and pacing

The safest pacing model is to anchor the effort to the average gradient, then protect yourself against the 12.32% ramps. Start below your climbing limit, especially if riding by /glossary/ftp, because the steepest sections will naturally push power up. The goal is not to avoid all surges - that is rarely possible on a climb with this spread between average and max - but to keep those surges short and controlled.

Think of the climb as a durability test. At 11.1 km, the cost of a small overreach early is not paid immediately. It shows up later, when the road still requires steady pressure and the gradient briefly tightens again. If you are pacing well, the final part of the climb should feel like a firm continuation of the same effort, not a rescue mission.

Gearing notes

Do not gear Paso de Arthur only for the 5.05% average. Choose a climbing gear that keeps you seated and smooth when the road reaches 12.32%. If your easiest gear forces a low-cadence grind on the steepest ramps, the climb becomes more muscular than it needs to be, and that can compromise the rest of the effort.

For most riders, the practical target is simple: stay aerobic on the moderate sections, shift early before the steepest pitches, and avoid standing unless it is a short reset rather than a sustained response. Paso de Arthur rewards restraint. The rider who keeps the first half controlled is the rider most likely to finish the climb still producing clean power.