Sekihoku Pass

Overview

Sekihoku Pass is a Category 3 climb in Japan, running 11.1 km from a start elevation of 645 m to a summit of 1,052 m. Over that distance it delivers a net elevation gain of 407 m at an average gradient of 3.67%. On paper those numbers read as a moderate, approachable ascent, the kind of climb you can settle into rather than survive.

The paper figures hide the real work. Total ascent on Sekihoku Pass is 716 m, which is 309 m more than the 407 m net gain. That difference is undulation: the road climbs, gives some of it back on descents or false flats, then climbs again. You pay for those 309 m twice, once climbing and once accelerating back out of each dip. Expect the effort to feel harder than the tidy 3.67% average suggests.

How the Gradient Unfolds

An average gradient of 3.67% is misleading on a climb this rolling. The mean is pulled down by flatter and downhill sections, which means the climbing pitches are steeper than the number implies, topping out at a maximum of 14.19%. You will spend little time actually riding at 3.67%.

• Flatter and recovery sections, including short descents, that drag the average down
• Repeated short climbs stacked back to back rather than one continuous grade
• A steepest ramp reaching 14.19%, sharp enough to force a gear change and a hard effort

Pacing Notes

On a rolling climb, even speed is a trap. Holding a constant pace forces you far over threshold on the steep ramps and lets you coast on the flats, spiking and dumping effort in a way that burns matches fast. Pace by effort instead. Anchor your climbing sections just below your sustainable power output and let your speed rise and fall with the gradient.

The 309 m of undulation is where riders overcook it, hammering each short climb as if it were the last. Know your ceiling before you start. Run the numbers through the FTP estimator, set a target for the steep pitches, and treat the descents as genuine recovery rather than a place to chase speed.

Gearing

The 14.19% maximum gradient dictates your setup. That pitch is steep enough to grind an under-geared drivetrain to a halt, so bring range. A compact or sub-compact chainset paired with a wide-range cassette, such as a 34×32 or 34×34, gives you a bailout gear to spin the steep ramps at cadence instead of muscling them. Check your chainring and cassette combination before the ride, not at the bottom of the climb.

Summary

• Length: 11.1 km
• Average gradient: 3.67%
• Maximum gradient: 14.19%
• Net elevation gain: 407 m
• Total ascent: 716 m
• Category: 3

Sekihoku Pass is a moderate climb on paper and a rolling, effort-testing one in the saddle. Respect the 309 m gap between net gain and total ascent, gear for the 14.19% ramp, and pace by effort to reach the 1,052 m summit with something left.