Colle di Valdobbia

Overview

Colle di Valdobbia is a long, patient effort of a climb: 28.8 km from a start elevation of 328 m up to a summit at 1744 m. That works out to 1416 m of net gain and a total ascent of 1339 m once the small dips and false flats are accounted for. The average gradient is a deceptively gentle 4.91%, but averages hide the truth here — buried somewhere in those kilometers is a maximum pitch of 30.45%, steep enough to stop an under-geared rider dead. Rated Category 1 (one rung below hors catégorie), it earns its stripes on sheer distance more than on relentless steepness.

How the Gradient Unfolds

With a 4.91% average spread across 28.8 km, most of this climb sits in a rhythm zone — the kind of grade you can settle into and hold for a long time. But the gap between that average and the 30.45% maximum tells the real story: the difficulty is not evenly distributed. Long stretches of moderate, sustainable gradient are punctuated by sharp ramps that spike far above the mean. Because the total ascent (1339 m) is slightly less than the net gain (1416 m) would suggest across a smooth road, expect some flatter reprieves and possibly brief descents that break up the rhythm. Save something for the pitches; they arrive when your legs are already deep into the effort.

Pacing Notes

On a climb this long, pacing is everything. Ride the moderate sections at or just below your threshold and treat the steep ramps as surges rather than sprints. Your FTP is the anchor number here: hold the sustained gradient a touch under it so you have headroom when the road kicks toward that 30.45% wall. If you do not know your threshold, run the numbers through the FTP estimator before you commit to a target — going out too hard on the first third of 28.8 km is the classic way to blow up two-thirds of the way to 1744 m. Fuel early and often; 1416 m of climbing burns through reserves fast.

Gearing

Distance plus that 30.45% spike means you want a wide range and low bottom end. A compact crankset paired with a 34×32 is the sensible baseline for most riders tackling a Category 1 climb of this length. If you climb at a lower cadence, carry extra weight, or simply want insurance against the steepest ramps, step up to a 34×34 — the extra teeth turn the nastiest pitches from a grind into something spinnable. Over 28.8 km, protecting your knees and keeping cadence up pays off long before the summit.

Summary

Colle di Valdobbia rewards patience: settle into the 4.91% rhythm, respect the 30.45% ramps, and let 28.8 km do the work of shredding the field behind you. Gear low, pace to your threshold, and the summit at 1744 m is yours.

Length: 28.8 km
Average gradient: 4.91%
Max gradient: 30.45%
Start: 328 m
Summit: 1744 m
Net gain: 1416 m
Total ascent: 1339 m
Category: 1