Sella Colle Mandrone

Overview

Sella Colle Mandrone is a long, patient climb rather than a punchy wall. Over 15.3 km it lifts you from a valley floor at 356 m to a summit of 933 m, a net gain of 577 m. The headline average gradient of 3.77% is gentle on paper, but that number hides the story: a category 2 ascent this length rarely climbs in a straight line. With a maximum pitch of 11.41%, there is enough bite here to break a rhythm you have spent kilometres building. Think of it as an endurance effort punctuated by sharper reminders, not a single sustained grind.

How the Gradient Unfolds

The gap between the 3.77% average and the 11.41% maximum tells you almost everything about the shape of this climb. A 15.3 km road that only gains 577 m net has to include flatter, recovering stretches — and those softer sections mathematically drag the average down. That means the steeper ramps sit well above 3.77% to compensate. Expect a climb of contrasts: passages where you can sit and spin, broken by pitches that rear up toward double digits. The total ascent of 567 m sits just below the 577 m net figure, confirming the road climbs almost continuously with only minor dips, so momentum built on the easy sections is worth guarding.

Pacing Notes

On a variable climb like this, the temptation is to attack every steep ramp. Resist it. Anchor your effort to a sustainable percentage of your FTP and let the gradient come to you — soft-pedal the shallow parts, but do not go into the red every time the road tilts toward 11.41%. Because the average is only 3.77%, you can afford to hold a steady tempo across most of the 15.3 km and spend your matches deliberately on the harder pitches. If you are unsure what wattage you can hold for the roughly 45 minutes a climb like this may take, run the numbers through the FTP estimator before you commit to a pacing plan.

Gearing

For a 15.3 km climb topping out at 11.41%, gearing is about protecting your legs on the steep ramps rather than surviving a relentless wall. A compact chainset paired with a 34×32 will cover most riders comfortably on the sustained sections. If you are carrying fatigue, riding loaded, or simply prefer to spin, step up to a 34×34 — that extra range keeps your cadence high when the gradient spikes and saves you from grinding through the toughest pitches. On the flatter parts, where the road eases well below 3.77%, you will still have plenty of top-end to keep the pace honest.

Summary

Sella Colle Mandrone rewards patience and smart pacing. It is long enough to test your endurance across 15.3 km, varied enough to punish riders who spend too early, and topped by pitches that justify its category 2 billing. Ride the average, respect the maximum, and you will crest at 933 m with something left.

Length: 15.3 km
Average gradient: 3.77%
Max gradient: 11.41%
Start: 356 m
Summit: 933 m
Net gain: 577 m
Total ascent: 567 m
Category: 2