Colle Langan

Overview

Colle Langan is a category-1 climb in Italy that trades brutal, sustained steepness for sheer length. Starting at just 10 m above sea level and topping out at 1182 m, it covers 26.9 km of road while its average gradient sits at a deceptively gentle 4.35%. That average hides the story, though: with 1172 m of net elevation gain and 1148 m of total ascent, the climb is long enough that patience matters more than power. It is the kind of ascent that rewards riders who can settle into a rhythm and hold it for well over an hour, rather than those who attack early and blow up.

How the Gradient Unfolds

The defining feature of Colle Langan is the gap between its 4.35% average and its 37.08% maximum. A near-38% wall is barely rideable, so expect the climb to be uneven: long stretches sitting close to or below the average, punctuated by short, savage kicks that spike far above it. Because net gain (1172 m) exceeds total ascent (1148 m) only marginally, there is very little descending or false-flat relief across the 26.9 km — the road tilts upward almost the whole way. Read the climb as a long, moderate base with sharp surprises, not a uniform grind.

Pacing Notes

Over 26.9 km, the smart approach is to ride the flatter sections comfortably below your threshold and save your matches for the steep ramps. Aim to hold a steady effort around your FTP, backing off slightly on the shallow kilometres so you have headroom when the gradient jumps toward that 37.08% maximum. Blowing up on an early ramp costs you dearly when there is this much road left. If you are unsure of your sustainable number, run the FTP estimator before you go — pacing a climb this long is far easier when you actually know your limit rather than guessing.

Gearing

Length plus that 37.08% spike means you should gear for survival, not speed. A compact 34-tooth chainring paired with a wide cassette is essential here. A 34×32 is the sensible minimum for the extended 4.35% averages, but on the steepest ramps a 34×32 will have you grinding at a cadence that punishes the legs over 26.9 km. If your frame and derailleur allow it, fit a 34×34 (or larger) so you can spin the vicious pitches and keep something in reserve for the kilometres that follow. On a climb this long, the extra sprocket is cheap insurance.

Summary

Colle Langan is a test of endurance and pacing more than raw climbing power. The 4.35% average keeps it approachable, but 26.9 km of near-constant ascent and a 37.08% wall mean you need a plan, patience, and low gears. Ride it steady, respect the ramps, and let the length do the work of tiring your rivals.

Length: 26.9 km
Average gradient: 4.35%
Max gradient: 37.08%
Start: 10 m
Summit: 1182 m
Net gain: 1172 m
Total ascent: 1148 m
Category: 1