Bocchetta dell'Orsaro

Overview

Bocchetta dell'Orsaro is an hors catégorie climb that earns its rank on the strength of one brutal statistic: 15.1 kilometres at an average gradient of 10.2%. Very few sustained climbs anywhere hold double-digit percentages over such a distance, and that combination is what pushes this ascent into the same conversation as the hardest mountains in cycling. You begin low, at 131 metres of elevation, and finish high, at a summit of 1673 metres. Between those two points lies 1542 metres of net gain, delivered over a road that almost never relents.

The total ascent of 1486 metres tells you the road climbs steadily rather than see-sawing with descents, so nearly all of the vertical work is pure, one-directional grind. There is nowhere to hide on a wall like this.

How the Gradient Unfolds

An average of 10.2% across 15.1 km is the headline, but it is worth sitting with what that number actually demands. On a climb this long, a 10.2% mean implies long, unbroken stretches at or above that figure, because even short easier sections must be balanced by steeper ramps elsewhere. Expect the gradient to stay stubbornly in the low double digits for kilometre after kilometre.

With 1542 metres of net elevation gain and only 1486 metres of measured ascent, the road offers essentially no recovery descents — the two numbers sit just 56 metres apart. Treat the whole 15.1 km as continuous climbing and plan your effort accordingly.

Pacing Notes

The single biggest mistake on a climb like Bocchetta dell'Orsaro is starting too hard. At 10.2% for 15.1 km, the road punishes any surge, so anchor your effort to your sustainable power rather than to feel. Riders who know their FTP should aim to hold a fraction below it for the opening two-thirds, leaving something for the final kilometres where fatigue compounds.

If you have never measured your threshold, the FTP estimator will give you a working number to pace against. Convert that into a target you can defend for well over an hour, because at these gradients you will not be climbing quickly no matter how strong you are. Break the 15.1 km into thirds and check in at each — steady, repeatable, and never redlined.

Gearing

Do not under-gear this climb. At a sustained 10.2% over 15.1 km, cadence collapses fast on anything too tall, and grinding a big gear for that long wrecks your legs. A compact 34-tooth chainring paired with a wide cassette is the sensible baseline. A 34×32 is the minimum most fit riders should consider, and many will be far happier with a 34×34, which buys precious extra cadence on the steepest ramps. If your setup allows an even easier bail-out gear, use it — spinning is survival here.

Summary

Bocchetta dell'Orsaro is a pure test of climbing endurance: long, steep, and unforgiving from 131 m all the way to 1673 m. Respect the gradient, gear low, pace to your threshold, and the summit is yours.

Length: 15.1 km
Average gradient: 10.2%
Max gradient: n/a
Start: 131 m
Summit: 1673 m
Net gain: 1542 m
Total ascent: 1486 m
Category: HC