Colle Ranzola

Overview

Colle Ranzola is a hors catégorie climb in Italy, and its numbers leave no room for doubt about the label. Over 14.8 km the road climbs from 1053 m to a summit of 2184 m, a net gain of 1131 m at an average gradient of 7.66%. That average alone would earn respect, but the climb hides a sting: pitches reach 22.4%, more than three times the mean. This is a sustained, high-altitude effort that starts where many climbs finish and only heads upward from there.

The total ascent of 1699 m exceeds the net gain of 1131 m, which tells you the road is not a clean monotonic ramp. There are dips and false flats where the elevation gives a little back, meaning you climb more vertical metres than the start-to-summit difference suggests. Expect roughly 568 m of extra up-and-down folded into the profile.

How the Gradient Unfolds

At 7.66% average across 14.8 km, there is nowhere to truly recover. But averages flatten the truth. The 22.4% maximum gradient is the headline hazard — a wall steep enough to break rhythm and force you out of the saddle, or into your easiest gear just to keep the wheels turning. The gap between the 7.66% average and that 22.4% spike is the whole story of pacing this climb: long stretches near the mean, punctuated by ramps that punch far above it.

Because total ascent (1699 m) runs 568 m higher than net gain (1131 m), the profile includes descending or flat sections. Those give brief relief but also mean the climbing pitches between them must be steeper than average to still net 1131 m of gain over the distance.

Pacing Notes

On a climb this long and steep, discipline beats bravado. Anchor your effort to a percentage of your FTP rather than chasing feel — 14.8 km at 7.66% is far too long to bluff. If you do not know your threshold, run the numbers through the FTP estimator before you commit to a target power.

The 22.4% ramps are where riders blow up. Do not try to hold steady power through them; let your effort surge briefly, then settle back to your sustainable number once the gradient eases. Remember you are working above 1053 m the entire time and finishing at 2184 m, so thinner air will nibble at your output near the top. Bank nothing early.

Gearing

For an HC climb averaging 7.66% with 22.4% pitches, gear low and gear again. A compact 34-tooth chainring is the sensible front. Pair it with at least a 34×32, which most riders will find only just adequate on the steepest walls. If your legs or your day are anything less than perfect, a 34×34 is the smarter call — the extra sprocket buys cadence exactly where the 22.4% ramps threaten to stall you. There is no prize for over-gearing here.

Summary

Colle Ranzola is a full HC test: long, high, and spiked with brutally steep ramps. Respect the length, gear generously, and pace to your threshold rather than your ego.

Length: 14.8 km
Average gradient: 7.66%
Max gradient: 22.4%
Start: 1053 m
Summit: 2184 m
Net gain: 1131 m
Total ascent: 1699 m
Category: HC