Colma Crocetta

Overview

Colma Crocetta is one of those climbs that refuses to negotiate. Over 8.6 km it averages a brutal 10.71%, dragging you from a start elevation of 199 m up to a 1119 m summit — a net gain of 920 m with 891 m of total ascent packed into a single, relentless effort. There is almost no flat here to hide the numbers: the average and the net gain tell the same story, which means the road tips up early and simply stays up. Rated HC — hors catégorie, the hardest classification above categories 1 through 4 — this is a climb built to break rhythm and expose any weakness in your fitness.

How the Gradient Unfolds

The defining feature is consistency of pain. With a 10.71% average sustained across 8.6 km, there are no genuine recovery sections to reset your legs — every kilometre asks for double-digit gradients. The sting in the tail is a 21.08% maximum ramp, roughly double the average, which means at some point the road nearly doubles its difficulty beneath your wheels. Those pitches are where cadence collapses and where riders who went out too hard pay the debt. Because the total ascent of 891 m sits just below the 920 m net gain, you can assume the profile is almost entirely one-directional: up, and then up more steeply.

Pacing Notes

On a climb this steep and this long, pacing is everything. Ride to your FTP, not to your ego. The opening kilometres feel deceptively manageable because you're fresh, but at 10.71% average the cost accrues fast — go 5% over threshold early and the 21.08% ramp will collect the interest with compound cruelty. Aim to sit just below threshold on the steady sections so you have headroom for the steepest pitches, where you'll briefly punch above it whether you like it or not. If you don't know your threshold number, run it through the FTP estimator before you commit, then set a power ceiling and defend it. Discipline in the first third buys survival in the last.

Gearing

Do not under-gear this one. For most riders a compact 34-tooth chainring paired with a wide cassette is the minimum sensible setup. A 34×32 is the floor — usable if you have strong legs and a low bodyweight, but it will leave you grinding through the steepest ramps at a cadence that shreds the legs. For nearly everyone, a 34×34 is the smarter choice, giving you a fractionally easier gear to spin the 21.08% sections rather than lever them. If your bike accepts an even larger cassette, take it. On an HC climb averaging 10.71%, spare gears are never wasted — they're insurance against blowing up two kilometres from the top.

Summary

Colma Crocetta is a true hors catégorie test: short enough to attack, steep enough to punish, and unforgiving from bottom to top. Respect the average, fear the maximum, gear low, and pace with discipline.

Length: 8.6 km
Average gradient: 10.71%
Max gradient: 21.08%
Start: 199 m
Summit: 1119 m
Net gain: 920 m
Total ascent: 891 m
Category: HC