Colle delle Coupe

Overview

Colle delle Coupe is a genuine hors catégorie monster, and the numbers make no attempt to hide it. Over 12.1 km the road climbs from 416 m to a summit of 1809 m, a net gain of 1393 m at an average gradient of 11.48%. That average alone would flag this as one of the hardest paved climbs anywhere; averages in double digits over more than ten kilometres are rare, and they punish everyone who underestimates them. The total ascent of 1354 m confirms there is virtually no respite: this is a climb that goes up, stays up, and keeps going up.

How the Gradient Unfolds

The defining feature here is relentlessness. With a net gain of 1393 m spread across 12.1 km, the road holds a steepness that most climbs only touch on their worst ramps. The 11.48% average tells you the "easy" stretches are still hard, and the 23.78% maximum tells you there are pitches that force you out of the saddle or into your lowest gear immediately. Because total ascent (1354 m) is slightly less than net gain (1393 m), the profile is almost purely upward — there are no meaningful descents to recover on, no rolling false flat to spin out your legs. Expect a wall that simply varies between very steep and savagely steep.

Pacing Notes

On a climb this sustained, pacing is not optional — it is survival. The 11.48% average means you cannot bank on flatter sections to recover, so ride to a power target from the first metre rather than to feel. A good rule is to keep your effort just under your FTP for the shallower stretches so you have headroom when the gradient spikes toward 23.78%. Those ramps will blow your power sky-high whether you like it or not, so spend your matches deliberately. If you don't know your threshold, run the numbers first with the FTP estimator and set a realistic ceiling. Over 12.1 km and 1393 m of climbing, going one gear too hard early costs you far more than starting conservatively.

Gearing

Bring your easiest cassette and then question whether it's easy enough. For an 11.48% average punctuated by 23.78% pitches, a compact 34-tooth chainring paired with a wide-range cassette is the minimum sensible setup. A 34×32 is the bare starting point, and most riders will be far happier with a 34×34 to keep cadence alive when the road stands up. On the steepest ramps even 34×34 will feel tall, so if you have access to a mountain-bike-style cassette or a smaller inner ring, use it. Preserving cadence over 12.1 km of sustained climbing protects your knees and your remaining energy for the summit at 1809 m.

Summary

Colle delle Coupe is a pure test of climbing endurance: unrelenting gradient, no recovery, and a summit earned metre by metre. Respect the average, fear the maximum, and gear low.

Length: 12.1 km
Average gradient: 11.48%
Max gradient: 23.78%
Start: 416 m
Summit: 1809 m
Net gain: 1393 m
Total ascent: 1354 m
Category: HC