Nozuka Pass

Overview

Nozuka Pass is a Category 1 climb in Japan, running 27.9km from the valley floor to a high mountain summit. It starts low at 17m of elevation and tops out at 1295m, delivering a net elevation gain of 1278m. At nearly 28 kilometres, it is a long, sustained effort rather than a short wall — the kind of climb where fitness and discipline matter more than a single explosive burst.

The headline number to watch is the gap between net gain and total ascent. You climb 1278m net, but the road actually forces 1735m of total ascent on you — 457m of that is extra climbing you do to claw back elevation lost on descents and dips along the way. This undulation means the climb never settles into a clean, predictable rhythm. Every metre you give back on a downhill roller is a metre you have to earn again, and that repeated re-acceleration taxes the legs far more than the average gradient suggests.

How the Gradient Unfolds

The 4.58% average is a comfortable-sounding figure that hides a spiky reality. Averages flatten out the descents and the ramps into one gentle number, but the road itself alternates between recovery and genuine strain. With 457m of ascent beyond the net gain, expect the profile to pitch up and down repeatedly rather than rise on a single steady grade.

• Flatter and downhill recovery sections where you can spin, refuel, and lower your heart rate
• Repeated short climbs that each demand a fresh surge of effort before easing off again
• A steep signature ramp that sits well above the average and will spike your power and cadence
• Long transitional grades hovering near the 4.58% mean, where you settle back into rhythm

Pacing Notes

On an undulating climb like Nozuka Pass, chase even effort, not even speed. Trying to hold a constant pace means over-cooking every ramp and coasting the descents — a fast way to blow up before the summit. Instead, anchor your effort to a target sustainable power output and let your speed rise and fall with the terrain.

Practically, that means holding steady watts on the flatter grades, letting the effort climb only modestly on the steep ramp rather than matching pace, and actively recovering on the descents. Know your ceiling before you start — the FTP estimator will give you a number to pace against so you ration the 1735m of total ascent evenly across all 27.9km.

Gearing

The steepest ramp on Nozuka Pass is severe enough to dictate your entire drivetrain choice. Do not gear for the 4.58% average — gear for the pitch that will otherwise leave you grinding at zero cadence. Run a compact or sub-compact chainset paired with a wide-range cassette; a 34×32 is the minimum, and a 34×34 gives you a genuine bailout gear for the worst of the ramp.

Check your setup before the ride. Confirm your rear derailleur can handle the largest sprocket and that the cassette is fitted, not just assumed — there is no room to discover you are under-geared halfway up a 28km climb.

Summary

• Length: 27.9 km
• Average gradient: 4.58%
• Net elevation gain: 1278 m
• Total ascent: 1735 m
• Category: 1

Nozuka Pass rewards riders who respect its undulation. Pace to power, gear for the steepest ramp, and treat every descent as recovery — do that, and the 457m of hidden climbing becomes a manageable tax rather than the reason you cracked.