Colla di Praglia

Overview

Colla di Praglia is a long, sustained Italian climb that trades brute steepness for endurance. Over 17.6 km it lifts you from a low start at 37 m to a summit of 875 m — a net gain of 838 m, with 830 m of total ascent once the small rolling sections are accounted for. The average gradient sits at a manageable-sounding 4.76%, but the length is what earns this ascent its category 1 rating. This is a climb you settle into rather than attack, where the clock and the accumulated meters do the damage rather than any single wall.

How the Gradient Unfolds

The headline number, 4.76%, tells only part of the story. On a climb this long, the average smooths over meaningful variation, and the pitch punches up to 12.43% at its steepest. That gap between average and maximum means the road is not uniform: expect stretches that sit comfortably below the average, offering brief recovery, punctuated by sharper ramps that spike toward that 12.43% figure. Because 830 m of ascent is spread across 17.6 km, the climb rarely relents fully — even the gentler sections keep tilting upward. The pattern rewards riders who can absorb the steep bites without blowing their rhythm, then re-settle when the road eases.

Pacing Notes

The single biggest mistake on a 17.6 km climb is starting too hard. With 838 m of vertical to gain, treat the effort as a long tempo rather than a series of surges. Anchor your pacing to your FTP and aim to hold a steady percentage of it that you can sustain for the full duration — for most riders that means climbing just below threshold and saving matches for the 12.43% ramps. If you are unsure of your threshold power, run the numbers first with the FTP estimator so your target on the day is grounded in real data rather than guesswork. On the steep pitches, let cadence drop slightly and power rise briefly, then return to your baseline the moment the gradient relaxes.

Gearing

At 4.76% average this looks like a climb you could muscle over, but the 12.43% ramps combined with 17.6 km of continuous work argue for gearing that protects your legs. A compact 34-tooth inner chainring is the sensible starting point. Pair it with at least a 34×32 low gear so you can spin the steep sections without grinding. If you tend to climb at a higher cadence, run tired, or expect to be near the back of your fitness on the day, go one step easier with a 34×34 — the extra range costs nothing on the flatter stretches and buys real relief when the road kicks toward its 12.43% maximum near your limit.

Summary

Colla di Praglia is a patience climb: 17.6 km, 838 m of net gain, and a category 1 label earned through length rather than savage gradient. Pace it like a long tempo, gear low enough for the steep ramps, and let the summit come to you.

Length: 17.6 km
Average gradient: 4.76%
Max gradient: 12.43%
Start: 37 m
Summit: 875 m
Net gain: 838 m
Total ascent: 830 m
Category: 1