Heda Pass

Overview

Heda Pass is a Category 1 climb in Japan that starts at sea level and tops out at 733m. Over its 8.4km, it delivers a net elevation gain of 733m, climbing from a start elevation of 0m to a summit elevation of 733m. That combination — significant length paired with a demanding average gradient — is what earns it its Category 1 status. There is no gentle valley approach here; the climbing begins from the water and does not let up for long.

The number that tells the real story is the gap between net gain and total ascent. While you gain 733m net, the total ascent over the climb is 949m — a difference of 216m. That means the road repeatedly dips and rises rather than climbing in a single clean line. You pay for those 216m of extra vertical twice: once climbing them, and again in the rhythm-breaking transitions. Expect the effort to feel harder than the net figure suggests.

How the Gradient Unfolds

The 8.76% average gradient is a blend, not a constant. With 216m of undulation baked in, some sections flatten or drop while others spike well above the average to compensate. The steepest recorded ramp reaches into the high twenties as a percentage — a wall that will force you out of the saddle if you are not geared for it. Averages hide these extremes; the pitches that break you are the ones far above 8.76%.

• Short recovery or flatter sections where the road briefly levels or dips
• Repeated short climbs stacked back to back, driven by the undulating profile
• At least one very steep ramp, far above the average, demanding a hard, brief effort

Pacing Notes

On a climb this uneven, chasing an even speed is a trap — you will burn matches surging over each rise and coast the dips. Instead, pace to an even effort. Hold a steady sustainable power output through the steep ramps and let your speed rise naturally on the flatter recovery sections rather than pushing to maintain a target pace. The undulation rewards riders who stay disciplined and punishes those who spike their power on every wall. If you do not know your ceiling, run the FTP estimator before you go, then ride the steep pitches just under it.

Gearing

The steepest ramp governs your setup, not the average. Ramps in the high twenties demand real range at the low end. Fit a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 combination gives you the bailout gear to spin the steepest walls instead of grinding them. Check your drivetrain before the ride: confirm the cassette and chainset are what you think, and that the chain shifts cleanly into the largest sprocket under load.

Summary

• Length: 8.4 km
• Average gradient: 8.76%
• Net elevation gain: 733 m
• Total ascent: 949 m
• Category: 1

Heda Pass is a Category 1 effort defined as much by its 216m of undulation as by its 733m of net gain. Pace to effort, gear low, and treat the steep ramps as the ride's decisive moments.