Passo d'Arena

Overview

Passo d'Arena is a Category 1 climb that packs a serious amount of vertical into a compact distance. Over its 9 km it averages 6.85%, rising from a valley floor at 87 m to a summit at 704 m. That is 617 m of net elevation gain, with 575 m of total ascent registered along the way. The average alone would make it a respectable day out, but a maximum pitch of 16.83% tells you the difficulty is not evenly spread. This is a climb of sustained effort punctuated by sharp, leg-emptying ramps — a Category 1 for good reason, sitting just below the hors catégorie tier.

How the Gradient Unfolds

The headline number to sit with is the gap between the 6.85% average and the 16.83% maximum. A climb this consistent-sounding on paper hides its teeth in that spread of nearly 10 percentage points. When a road averages just under 7% but spikes above 16%, it means the gentler sections are doing real work to keep the average down — and those steep pitches will feel far harder than the mean suggests. Expect the effort to come in waves rather than as a single steady drag. Over 9 km the 617 m of net gain never lets up for long, and the difference between net gain (617 m) and total ascent (575 m) hints at a profile that mostly points upward with little relief. Ride the average, but respect the ramps.

Pacing Notes

The smart way to approach a climb like this is to anchor your effort to your FTP rather than to how the first kilometre feels. At 9 km and 6.85% average, this is long enough that going too deep early will cost you badly when the 16.83% sections arrive. Hold something in reserve on the shallower pitches so you can absorb the steep ramps without redlining. If you don't know your threshold, run your recent efforts through the FTP estimator first — a realistic number turns pacing from guesswork into a plan. Aim to crest the 704 m summit with your effort curve intact, not detonated on the steepest ramp.

Gearing

With a 16.83% maximum and 617 m to grind out, gearing matters more here than raw fitness for most riders. A compact 34-tooth chainring is the sensible front. For the cassette, a 34×32 is the minimum I'd recommend, giving you a bailout gear that keeps your cadence spinning through the steep pitches instead of grinding. If you're carrying weight, riding tired, or simply prefer to protect your knees on a Category 1, step up to a 34×34 — the extra range is cheap insurance against the 16.83% ramps. Both keep you seated and turning the pedals rather than lurching out of the saddle.

Summary

Passo d'Arena is a compact, honest Category 1 climb: 9 km that gains 617 m, averaging 6.85% but with enough sting in its 16.83% maximum to demand respect and the right gearing. Pace it off your threshold, gear low, and let the ramps come to you.

Length: 9 km
Average gradient: 6.85%
Max gradient: 16.83%
Start: 87 m
Summit: 704 m
Net gain: 617 m
Total ascent: 575 m
Category: 1