Passo Lagastrello

Overview

Passo Lagastrello is a long, patient climb that rewards riders who can settle into a rhythm and hold it. Over 23.7 km it lifts you from a valley floor at 67 m all the way to a summit of 1197 m, a net gain of 1130 m. The average gradient sits at a moderate 4.77%, which on paper reads friendly — but at nearly 24 km long, this is a Category 1 effort that asks for endurance far more than raw power. The distance is what defines it. There are no short, sharp escapes here; you commit early and keep turning the pedals for the better part of an hour or more.

How the Gradient Unfolds

Do not let the 4.77% average lull you. That figure is the mean across the entire 23.7 km, and the total ascent of 1110 m is spread unevenly along the way. The climb pulses between gentler drags and steeper ramps that spike as high as 11.44% — more than double the average. Because the road covers so much ground, those steep sections tend to arrive as isolated walls between longer, shallower stretches rather than as one sustained pitch. The gap between the 4.77% average and the 11.44% maximum is the story of this climb: long enough to recover on the flatter parts, steep enough in the pinches to punish anyone who overcooks the transitions.

Pacing Notes

On a climb this length, pacing is everything. Aim to ride the majority of Passo Lagastrello just below your FTP, holding a sustainable tempo on the shallower drags and allowing your effort to rise only briefly through the 11.44% ramps before easing back. Blowing up in the first 10 km leaves a very long way to suffer. If you are not sure what wattage your threshold sits at, use the FTP estimator to set a realistic target before you start. With 1130 m of net elevation to absorb, discipline in the opening third pays back tenfold near the top.

Gearing

For a 23.7 km climb with ramps reaching 11.44%, favour range over pride. A compact chainring paired with a wide cassette is the sensible choice for most riders. A 34×32 will cover the majority of the gradient comfortably and keep your cadence up on the shallower sections. For anyone carrying fatigue, riding at a lower threshold, or simply wanting insurance for the steepest pitches, a 34×34 gives you that extra spin to survive the 11.44% walls without grinding. Given the length, err toward the easier gear — a high cadence over 23.7 km taxes the legs far less than muscling a big gear.

Summary

Passo Lagastrello is an endurance climb first and foremost: nearly 24 km of steady elevation with occasional bite. Ride it patiently, gear generously, and respect the distance, and the summit at 1197 m is well within reach.

Length: 23.7 km
Average gradient: 4.77%
Max gradient: 11.44%
Start: 67 m
Summit: 1197 m
Net gain: 1130 m
Total ascent: 1110 m
Category: 1