Col de Marsolino

Overview

Col de Marsolino is a category 3 climb in France, running 11.5 km from a near sea-level start at 6 m to a summit of 430 m. On paper that gives a net elevation gain of 424 m, and the climb starts practically at the coast before topping out on a modest col. It is the kind of ascent that reads as easy in a stats box and rides harder in the legs.

The reason is the gap between the numbers. Net elevation gain is 424 m, but total ascent is 628 m — roughly 204 m of climbing you do twice, because the road gives it back before taking it again. That undulation means you are not settling into one steady grade for 11.5 km; you are repeatedly resetting rhythm, bleeding momentum on the descents, and re-accelerating. Expect the effort to feel punchier than the 3.68% average suggests.

How the Gradient Unfolds

A 3.68% average is deceptive here. With 628 m of total ascent packed around a 424 m net gain, the road clearly rolls, and the flat-sounding average is a blend of downhill, false-flat, and genuinely steep pitches. The standout number is the 17.63% maximum — a wall that has nothing to do with the average.

• Flatter and recovery sections early and between rollers, where the average is "spent"
• Repeated short climbs that break your cadence and force re-accelerations
• A single steepest ramp hitting 17.63%, the pitch that governs your gearing choice

Pacing Notes

On a smooth climb you can chase even speed. On Marsolino, don't — the undulation punishes it. Ride to even effort instead, holding a steady sustainable power output through the rises and easing rather than spiking on the short steep bits. Let speed rise on the flatter and downhill segments and refuse the temptation to hammer over each roller.

The 17.63% ramp is where riders overcook things. Cap your surge there, spin through, and recover on the far side. If you don't know your ceiling, run the FTP estimator first and set a wattage cap you can hold across all 11.5 km, not just the opening kilometres.

Gearing

Gear for the steepest pitch, not the average. A 17.63% ramp at the end of an undulating 11.5 km rewards a compact (34-tooth inner) or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 keeps your cadence up when the wall arrives with tired legs. Check your setup before the ride; discovering you are over-geared halfway up the 17.63% section is a mistake you make only once.

Summary

• Length: 11.5 km
• Average gradient: 3.68%
• Maximum gradient: 17.63%
• Net elevation gain: 424 m
• Total ascent: 628 m
• Category: 3

Col de Marsolino is a short category 3 climb that hides real texture behind a gentle average. Respect the undulation, gear for the 17.63% ramp, and pace to effort — do that and the 628 m of total ascent will feel earned rather than punishing.