Nagao Pass

Overview

Nagao Pass is a Category 2 climb in Japan, running 13.1 km from a start elevation of 268 m to a summit at 950 m. Over that distance it delivers a net elevation gain of 682 m at an average gradient of 5.2%. On paper that reads as a steady, moderate ascent — long enough to demand pacing discipline, but with an average that never looks intimidating.

The average, though, undersells the work. The total ascent is 793 m against a net gain of just 682 m, which means roughly 111 m of the climb is descent you have to re-climb. That undulation matters: every metre you give back is a metre you pay for twice, so your legs and heart rate see sharper swings than a smooth 5.2% grade would produce. Expect the effort to feel choppier than the headline figures suggest.

How the Gradient Unfolds

A 5.2% average on a rolling profile hides two things: the flatter or downhill sections that drag the mean down, and the steeper ramps that spike well above it. On Nagao Pass the gradient rarely sits at 5.2% for long — it oscillates, with the hardest pitches concentrated where the road pinches.

• Flatter and recovery sections where the grade eases and you can shift up and spin
• Repeated short climbs separated by the descents that create the 111 m of extra ascent
• The steepest ramp, well above the average, where the grade bites hardest and forces you out of rhythm

Pacing Notes

On an undulating climb like this, chasing an even speed is a trap — holding pace over the steep ramps spikes your effort into the red, and you overspend early. Pace by even effort instead: anchor your climb to a target sustainable power output and let your speed rise and fall with the terrain. Ease slightly on the descents and false flats to recover, then hold steady through the steep pitches rather than surging.

If you do not know your ceiling, run the numbers through the FTP estimator first, then set a climbing target a touch below it that you can defend across all 13.1 km.

Gearing

The steepest ramp is what dictates your setup, not the 5.2% average. Come with a compact or sub-compact chainset and a wide-range cassette — a 34×32 or 34×34 low gear gives you the room to keep cadence up when the grade steepens and to spin through the repeated short climbs without grinding. On a rolling profile that forces frequent gear changes, the ability to drop into a low gear cleanly is worth more than raw top-end. Check your chainset and cassette before the ride so you are not caught over-geared on the hardest pitch.

Summary

• Length: 13.1 km
• Average gradient: 5.2%
• Maximum gradient: 18.15%
• Net elevation gain: 682 m
• Total ascent: 793 m
• Category: 2

Nagao Pass is a moderate climb with a punchy character. Ride it by effort, gear low for the steep ramps, and treat the 111 m of undulation as the real challenge behind the friendly average.