Bocca di Navene

Overview

Bocca di Navene is a full-blown HC ascent, the hardest category on the scale, and it earns that label the honest way. Over 17.6 km you climb from a start elevation of 202 m to a summit at 1523 m, banking 1321 m of net elevation gain and 1319 m of total ascent along the way. The average gradient of 7.49% never really lets you breathe, and with a max gradient of 13.63% there are ramps steep enough to force a hard decision about whether to grind or spin. This is a climb measured in patience: nearly the entire effort sits above 7%, so the challenge is less about surviving one wall and more about holding a sustainable output for the better part of an hour.

How the Gradient Unfolds

With almost no difference between net gain (1321 m) and total ascent (1319 m), Bocca di Navene climbs in essentially one direction — up. There are virtually no false flats or descents to recover on, which is what makes a 7.49% average so punishing over 17.6 km. Expect long stretches that hover right around the average, punctuated by pitches that rear up toward the 13.63% maximum. Because the steepest sections spike well above the mean, your instantaneous effort will swing far more than the tidy average suggests. Treat the average as the floor of your discomfort, not the ceiling, and read the road ahead so a sudden double-digit ramp doesn't catch you in the wrong gear.

Pacing Notes

On a climb this sustained, discipline beats bravado. The smartest approach is to anchor your effort to your FTP and hold a steady percentage of it rather than chasing surges. Roughly 40 to 50 minutes of continuous climbing means going into the red early will cost you dearly near the top, where the 1523 m summit thins the air and legs. Ride the shallower-than-average sections just below threshold, then allow your power — not your speed — to climb slightly on the steep pitches toward 13.63%, keeping cadence intact. If you don't know your threshold number yet, run it through the FTP estimator before you tackle Navene so your target zones are grounded in real data instead of guesswork.

Gearing

A 7.49% average with ramps to 13.63% over 17.6 km is exactly the profile that rewards generous gearing. A 34×32 bottom gear is the sensible baseline for strong climbers who can hold good cadence at threshold, but most riders will be glad of a 34×34 for the steepest kicks, especially deep into the climb when fatigue erodes your comfortable cadence. Given 1319 m of ascent stacked into a single effort, err toward the easier option — the extra range costs you nothing on the shallower gradients and buys you a lifeline on the walls. Spinning a slightly-too-easy gear is always cheaper than grinding a too-hard one.

Summary

Bocca di Navene is a genuine HC test: long, unbroken, and steep enough to demand respect from the first kilometre. Pace it to your threshold, gear it for the ramps, and let the 1321 m of climbing come to you.

Length: 17.6 km
Average gradient: 7.49%
Max gradient: 13.63%
Start: 202 m
Summit: 1523 m
Net gain: 1321 m
Total ascent: 1319 m
Category: HC