Manghen Pass

Overview

Manghen Pass is a hors catégorie climb that earns its status the hard way. Over 13 km the road drags you from a start elevation of 801 m to a summit at 1998 m, a net gain of 1197 m of altitude on legs that never get a genuine rest. The headline number is the one that matters most here: an average gradient of 9.24%. Averages can lie on many climbs, softened by flat valleys and false summits, but a figure this high sustained across 13 km tells you almost everything. There is no hiding place, and the 21.72% maximum gradient promises at least one moment where the road simply stands up in front of you. This is a climb to be respected before you ever clip in.

How the Gradient Unfolds

With 1150 m of total ascent packed into 13 km, the shape of Manghen Pass is relentless rather than explosive. A 9.24% average means the "easy" stretches are still solidly into the range that burns, and the pitches that pull the average upward are brutal. The gap between the 9.24% average and the 21.72% maximum is your warning: expect sudden ramps that roughly double the effort of the surrounding road. On a climb like this, the danger is not a single wall but the accumulation of grade after grade with no recovery. The difference between net gain (1197 m) and total ascent (1150 m) is small, confirming there is very little downhill respite hidden in the profile. What goes up here mostly keeps going up.

Pacing Notes

Restraint wins on Manghen Pass. The single biggest mistake is chasing the early ramps and blowing your effort before the halfway point of the 13 km. Anchor your pace to your sustainable power, not to how you feel in the first kilometre. Your FTP is the reference point: on a 9.24% average grinder, sitting just under threshold for the length of the climb is far more reliable than repeated surges you cannot repeat. If you do not know your number, run the FTP estimator before you plan the ascent. When the road hits the 21.72% pitches, accept that your power will spike briefly — that is unavoidable — but return to your target effort the moment the grade eases back toward the average.

Gearing

Do not under-gear this climb. A 9.24% average sustained over 13 km, with ramps to 21.72%, punishes anyone caught in too big a gear at low cadence. For most riders a compact chainring with a wide-range cassette is the right call. A 34×32 is the sensible minimum, and even strong riders will be glad of it on the steepest sections. If you are carrying any fatigue, prefer the lower climbing gears — a 34×34 gives you the headroom to spin through the 21.72% pitches rather than grinding to a standstill. Cadence protects your legs across 1150 m of climbing far better than raw strength.

Summary

Manghen Pass is a pure HC test: 13 km that never relents, a 9.24% average that stays honest the whole way, and a 21.72% maximum to remind you why it is rated hors catégorie. Pace it with discipline, gear it generously, and respect the 1197 m of altitude you are asked to climb.

Length: 13 km
Average gradient: 9.24%
Max gradient: 21.72%
Start: 801 m
Summit: 1998 m
Net gain: 1197 m
Total ascent: 1150 m
Category: HC