Mikuni Pass

Overview

Mikuni Pass is an 11 km Category 2 climb in Japan. It starts at 754 m and tops out at a summit elevation of 1399 m, for a net elevation gain of 645 m across the ascent. At a Category 2 rating, it is a serious but attainable effort — long enough to demand pacing discipline, short enough to hold a steady rhythm without needing a full alpine strategy.

The headline number, however, hides some texture. The net gain is 645 m, but the total ascent is 782 m — a difference of 137 m. That gap is undulation: sections where the road dips or flattens before climbing again, meaning you re-climb ground you have already given back. Practically, you will do more vertical work than the net figure suggests, and the flatter breaks between pitches disrupt any single sustained rhythm.

How the Gradient Unfolds

The average gradient of 5.89% is a blended figure across the full 11 km. On an undulating climb like this, the average masks both easier stretches and sharper ramps — you will rarely be riding at exactly 5.89%. The 137 m of extra ascent tells you the road repeatedly eases and then bites back.

Expect a profile roughly like this:

• Flatter or recovery sections where the gradient drops well below average, letting you spin and shed heat
• Repeated short climbs that reload the legs after each break, so effort never fully settles
• Steeper ramps well above the 5.89% average, where you punch over the pitch before it relents again

Pacing Notes

Because Mikuni Pass undulates, even-speed pacing is a trap: holding a constant km/h forces you to spike watts on every ramp and coast on every dip, burning matches you will want at the top. Pace to even effort instead. Anchor your climb to a target sustainable power output — hold that band up the steep pitches and let your speed rise naturally on the flatter recovery sections rather than pushing to keep the clock steady.

If you do not know your ceiling yet, run the FTP estimator before the ride and set a climbing target a comfortable margin below it, so the repeated re-climbs over 11 km do not empty you before the summit.

Gearing

On a climb with pitches well above the 5.89% average, gear for the steepest ramp, not the average. A compact (34-tooth) or sub-compact chainset paired with a wide-range cassette gives you the bailout gears to spin over the sharp sections instead of grinding. A 34×32 is a sensible floor; 34×34 gives more margin if you fatigue late or ride heavy. Check your actual chainset and cassette before the ride — do not assume, confirm — so you are not caught over-geared on a steep pitch with no cog left to shift into.

Summary

• Length: 11 km
• Average gradient: 5.89%
• Net elevation gain: 645 m
• Total ascent: 782 m
• Category: 2

Mikuni Pass rewards riders who respect its undulation. Pace to effort, gear for the steep ramps, and treat the 137 m of hidden ascent as work you must budget for — do that, and this Category 2 climb becomes a rhythm you can hold to the summit.