Passo dell'Om di Làres

Overview

Passo dell'Om di Làres is a long, patient climb rather than a wall of steep switchbacks. Over 24 km the road lifts you from 549 m at the base to a summit of 1589 m, and the profile logs a net gain of 1040 m against a total ascent of 1022 m. The two figures sit close together, which tells you almost every metre of this road points uphill — there are precious few descents to give the numbers away.

At a category 1 rating it lands one notch below the hardest hors catégorie climbs, and the reason is time under tension rather than raw steepness. The 4.34% average is approachable on paper, but stretched across 24 km it becomes a sustained effort measured in tens of minutes at threshold.

How the Gradient Unfolds

The headline figure is that 4.34% average, and with total ascent (1022 m) so near net gain (1040 m), the climb is remarkably honest: it keeps climbing without meaningful respite. The small 18 m gap between the two elevation figures is the only hint of any flatter or rolling sections, so you should not expect long recovery stretches to hide in.

What this shape rewards is rhythm. A climb that averages 4.34% over 24 km is one where consistency beats heroics — hold a steady cadence, keep the effort even, and let the metres accumulate. The gradient here is a metronome, not a hammer.

Pacing Notes

This is a climb to ride at, or just below, your sustainable ceiling. Because it spans 24 km, small pacing errors compound: going 5% too hard in the first few kilometres costs far more than it would on a short climb. Anchor your effort to your FTP and aim to sit around a percentage you can genuinely hold for the full 1040 m of climbing.

If you are not sure what number to target, run the figures through the FTP estimator before you go, then translate that into a wattage band you can defend from base to summit. On a 4.34% average, staying a touch conservative early almost always yields a faster overall time to the 1589 m top.

Gearing

The steady 4.34% average makes gearing more forgiving than a punchy climb, but 24 km of continuous ascent still argues for spinning gears over grinding ones. A compact 34-tooth inner chainring paired with a wide-range cassette is the sensible default here.

For most riders a 34×32 gives enough range to keep cadence high without dropping into a struggle on any pitch above the average. If you climb at a lower cadence, carry extra fatigue, or simply want insurance across the full 1040 m of gain, step up to a 34×34 — the extra sprocket costs nothing on the flatter sections and buys real comfort late in the climb when the legs are deep into the effort.

Summary

Passo dell'Om di Làres is a test of steady, disciplined climbing: 24 km of near-continuous ascent at a manageable 4.34% that punishes over-eager pacing and rewards patience. Set your gearing to spin, meter your effort against threshold, and let the 1040 m of gain come to you.

Length: 24 km
Average gradient: 4.34%
Max gradient: n/a
Start: 549 m
Summit: 1589 m
Net gain: 1040 m
Total ascent: 1022 m
Category: 1