Mã Pí Lèng Pass

Overview

Mã Pí Lèng Pass is a Category 1 climb that stretches 12.2 km from a base at 499 m to a summit of 1335 m. Over that distance the road averages a demanding 6.84%, and the profile spikes as high as 12.97% where the gradient bites hardest. The net elevation gain is 836 m, while the total ascent recorded on the road is 802 m — the small gap between the two tells you the climb is not perfectly monotonic, with a handful of brief flatter or downhill respites folded into the overall drag upward.

At just over 12 km with a mid-6% average, this is a sustained effort rather than a short burst. It sits firmly in the range where you cannot simply muscle over the top — you have to meter your effort from the very first kilometre.

How the Gradient Unfolds

The headline number is the 6.84% average, but averages hide the story. A summit at 1335 m sitting 836 m above the 499 m start means the road rarely relents for long. The 12.97% maximum is nearly double the average, so expect the pitch to swing well above 6.84% in the steepest ramps and dip back below it on the recovery sections.

Because total ascent (802 m) is slightly less than the net gain of 836 m relationship suggests a mostly relentless upward road with only minor levelling. Treat every stretch that eases as a gift to spin the legs, not a place to attack.

Pacing Notes

The single most useful lever on a 12.2 km climb at 6.84% is holding a steady, sustainable power. Anchor your effort to your FTP: most riders can hold a Category 1 climb of this length at a percentage of threshold that keeps them just below the red line, saving matches for the 12.97% ramps.

If you don't know your threshold, run the numbers through the FTP estimator before you go. Then aim to keep your average right around your target for the full 836 m of climbing — start conservatively in the first few kilometres, because the elevation you still have to cover to reach 1335 m is unforgiving of an early over-effort.

Gearing

With an average of 6.84% and pitches to 12.97% sustained over 12.2 km, gear for cadence, not ego. A compact 34-tooth inner ring paired with a wide-range cassette is the sensible baseline here. A 34×32 will get most fit riders up the steady sections, but on the steepest ramps toward the 1335 m summit you will be grateful for the extra relief of a 34×34.

If you tend to grind or you're carrying luggage, default to the 34×34 and keep a smooth, high cadence. Spinning a lighter gear over 836 m of climbing protects your legs far better than pushing a big gear into the 12.97% walls.

Summary

Mã Pí Lèng Pass is a proper Category 1 test: 12.2 km of climbing that averages 6.84%, ramps to 12.97%, and lifts you 836 m from valley to ridge. Pace it off your threshold, gear low, and respect the steep pitches, and the summit at 1335 m is a rewarding place to arrive.

Length: 12.2 km
Average gradient: 6.84%
Max gradient: 12.97%
Start: 499 m
Summit: 1335 m
Net gain: 836 m
Total ascent: 802 m
Category: 1