Passo Bordala

Overview

Passo Bordala is a hors catégorie climb that hides nothing. Over 11.5 km it averages a relentless 9.02%, hauling you from a start elevation of 228 m to a summit at 1265 m. That is a net gain of 1037 m, with 1028 m of total ascent packed into a road that rarely relents. There are no long false flats to recover on and no rolling reprieve to reset your legs. A near-9% average over that distance places Bordala firmly among the climbs that demand respect from the first pedal stroke, and the HC label is fully earned rather than decorative.

How the Gradient Unfolds

The number that defines this climb is the gap between its 9.02% average and its 17.7% maximum. On a gentler climb that spread would suggest a few isolated ramps. Here, with the mean already sitting above 9%, a 17.7% pitch means the steep sections are genuinely brutal — nearly double the average, layered on top of legs that are already loaded. Expect the gradient to hover in the high single digits for long stretches, then rear up into double digits without much warning. Because the average stays so high across all 11.5 km, there is no single "crux" to survive and then coast; the difficulty is distributed the whole way up. Treat every easing as temporary and every ramp as the norm returning.

Pacing Notes

With 1037 m of climbing at this gradient, pacing is everything. The steady 9.02% average means your power will sit close to threshold for the full duration, so anchoring your effort to FTP is the smart move. Ride the sustained sections just under threshold and reserve headroom for the 17.7% ramps, where holding the same speed costs far more watts. Going into the red early on a climb this long and this steep is unforgiving — there is no flat to soft-pedal and recover. If you are unsure of your number, run the FTP estimator before you commit to a target, then hold that ceiling patiently across all 11.5 km rather than chasing the steep pitches.

Gearing

This is a climb where gearing choices are felt in your knees, not just your legs. For a 9.02% average punctuated by 17.7% ramps, err generously toward easier ratios. A compact 34-tooth chainring paired with a 34×32 cassette is a sensible baseline, but on a climb this sustained many riders will be grateful for a 34×34. The extra rescue gear keeps your cadence up on the steepest pitches, which matters more when those ramps arrive after kilometres of accumulated fatigue rather than fresh. If your setup allows it, choose the lower option — spinning a 34×34 up the worst of Bordala beats grinding a 34×32 into the ground.

Summary

Passo Bordala is a true HC test: long, uniformly steep, and unforgiving from bottom to top. Come with low gears, a paced effort anchored to threshold, and the patience to let the climb come to you.

Length: 11.5 km
Average gradient: 9.02%
Max gradient: 17.7%
Start: 228 m
Summit: 1265 m
Net gain: 1037 m
Total ascent: 1028 m
Category: HC