Col du Mont d'Orzeires

Overview

The Col du Mont d'Orzeires is a category 3 climb in Switzerland, running 6.6 km from a start elevation of 745 m to a summit at 1080 m. On paper that is a net elevation gain of 335 m at an average gradient of 5.08% — a moderate ascent that most riders would expect to spin through without much drama.

The numbers hide the real work. Total ascent over the climb is 774 m, more than double the 335 m net gain. That gap means roughly 439 m of the elevation you earn on the way up is given straight back on descending or flat sections in between. The road undulates rather than climbs steadily, so you are repeatedly accelerating, cresting, and losing rhythm. Expect the effort to feel harder than a 5.08% average suggests, because you rarely get to settle into one cadence.

How the Gradient Unfolds

An average of 5.08% is a poor guide to this climb. With a maximum gradient of 25.17%, there is at least one ramp far steeper than anything the average hints at, and the undulating profile means the true climbing pitches are steeper still to offset the flat and downhill portions folded into the average.

• Flatter and recovery sections where the road levels or dips, dragging the average down.
• Repeated short climbs rather than one continuous grade — plan to reset your rhythm several times.
• A steepest ramp near 25.17%, brief but severe enough to force you out of the saddle if your gearing is short.

Pacing Notes

On a steady climb you would target sustainable power output and hold it. Here, even-effort pacing beats even-speed pacing decisively. Chasing a constant speed on the undulations forces huge power spikes on every ramp, and those repeated efforts above threshold will empty your legs before the summit.

Instead, let your speed rise and fall while keeping power steady: ease slightly on the steep pitches, carry momentum over the crests, and use the flatter and downhill sections to recover rather than hammer. If you do not know your threshold, run the FTP estimator first so you have a real ceiling to pace against.

Gearing

The 25.17% maximum gradient dictates your setup. A compact 34-tooth inner ring is the minimum, and on a climb this punchy a sub-compact chainset is worth considering. Pair it with a wide-range cassette — a 34×32 or 34×34 low gear gives you a bailout for the steepest ramp so you can keep spinning instead of grinding to a stall. Check your chainset and cassette before the ride; discovering you are over-geared halfway up a 25% wall is not the place to find out.

Summary

• Length: 6.6 km
• Average gradient: 5.08%
• Maximum gradient: 25.17%
• Net elevation gain: 335 m
• Total ascent: 774 m
• Category: 3

Treat the Col du Mont d'Orzeires as an undulation exercise, not a steady drag. Pace by power, gear for the steepest ramp, and the 774 m of total ascent will feel earned rather than punishing.