Colle del Vento

Overview

Colle del Vento is an HC-category climb in Italy, running 10.1 km from a start elevation of 458 m to a summit at 1,631 m. The net elevation gain is 1,173 m, which over that distance produces an average gradient of 11.63%. That figure alone places it firmly among the hardest sustained ascents you can ride: HC status is earned here on raw steepness, not just length.

The important detail is the gap between the numbers. Net elevation gain is 1,173 m, but total ascent is 1,585 m. That 412 m difference means the road drops and re-climbs along the way — you pay for descents by regaining that height. The climb is not a clean upward ramp; it undulates, and every metre lost to a downhill is a metre you have to earn back at gradients well above the 11.63% average.

How the Gradient Unfolds

An 11.63% average on an undulating profile is misleading. Because 412 m of the total ascent comes from re-climbing after descents, the flatter and downhill sections drag the average down — which means the genuine uphill pitches are steeper than the headline number suggests. The maximum gradient hits 30.38%, a wall that demands you are out of the saddle and already in your easiest gear before you reach it.

• Short recovery or flatter sections where the road briefly eases or tips downhill
• Repeated short climbs that reclaim the height lost on those descents
• A steepest ramp touching 30.38%, far beyond anything the average prepares you for

Pacing Notes

On a clean, steady climb you can hold even effort and let speed drift. Colle del Vento's undulation breaks that. Chasing even speed here forces you to spike power on every re-climb and coast the descents — a fast route to blowing up. Instead, pace to even effort: hold a target just under your sustainable power output, let speed fall on the steep pitches, and resist hammering the descents to "make up time." Know your ceiling before you start — the FTP estimator will tell you the wattage you can defend for the roughly hour-plus this climb will take.

Gearing

The 30.38% maximum dictates everything. This is not a climb for a standard road setup. Run a compact or sub-compact chainset paired with a wide-range cassette — a 34×32 or 34×34 is the sensible floor, and going lower is defensible. Check your setup before the ride, not at the base of the wall. If your easiest gear feels comfortable on a 15% test hill, it is still not enough for 30%.

Summary

• Length: 10.1 km
• Average gradient: 11.63%
• Maximum gradient: 30.38%
• Net elevation gain: 1,173 m
• Total ascent: 1,585 m
• Category: HC

Colle del Vento is a climb where the average understates the difficulty and the undulation multiplies it. Respect the 412 m of hidden re-climbing, gear low, pace to effort, and treat the 30.38% ramp as the moment the whole ride is decided.