Aokuzure Pass

Overview

Aokuzure Pass is a Category 1 climb in Japan, running 12.9 km from a start elevation of 378 m to a summit at 1,108 m. On paper that is a net elevation gain of 730 m spread across the full length, which places it firmly in the middle band of serious road climbs — long enough to demand pacing, not so long that it becomes an all-day objective.

The headline net gain undersells the work, though. Total ascent on the climb is 1,510 m, roughly double the 730 m net figure. That gap of 780 m is undulation: climbing you do that is later given back on descents and false flats before the road tips up again. Practically, it means you should expect to pedal hard over more vertical metres than the net number suggests, and your legs will register the repeated surges rather than one smooth grind.

How the Gradient Unfolds

The 5.64% average gradient is a blend, not a description of the road you actually ride. With 1,510 m of total ascent packed into 12.9 km, the steep pitches are considerably harder than the average implies, offset by flatter and downhill stretches that drag the mean down.

• Recovery sections and short descents that give back elevation and reset the average
• Repeated short climbs stacked on top of one another rather than one continuous wall
• A steepest ramp well above 5.64% — plan to be out of the saddle and grinding through it

Pacing Notes

On an undulating climb like this, chasing an even speed is a trap: you will overcook the steep ramps trying to hold a number and then coast the flatter sections. Pace on even effort instead. Anchor your climb to a target sustainable power output and let your speed rise and fall with the terrain — faster on the recovery sections, slower through the steep pitches, but the effort steady throughout.

If you do not know your threshold, run the FTP estimator before you go, then hold a percentage of that figure on the sustained ramps and only exceed it briefly where the road pitches up sharply.

Gearing

The steepest ramps here reward a setup built for low speed under load. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 gives you a bailout gear for the steep pitches without stranding you on the flatter, faster sections between them. Check your chainset and cassette before the ride; the middle of a steep ramp is a poor place to discover you have run out of gears.

Summary

• Length: 12.9 km
• Average gradient: 5.64%
• Net elevation gain: 730 m
• Total ascent: 1,510 m
• Category: 1

Aokuzure Pass is a climb defined by its undulation. The 730 m net gain and 5.64% average both understate a route with 1,510 m of total ascent, so pace on effort, gear low, and treat the rollers as part of the work rather than the reward.