Qumbel pass

Overview

Qumbel pass is a long-haul category 1 ascent that trades brute steepness for sheer duration. Over 40.5 km it climbs from a valley floor at 1339 m to a summit at 3052 m, a net gain of 1713 m. The average gradient of 4.22% sounds gentle on paper, and in isolation it is — but sustaining that slope for 40.5 km, while the air thins toward a 3052 m ceiling, is a different kind of hard. This is a climb of patience and rhythm rather than explosive efforts, the sort where the clock and the altitude do the damage long before any single ramp does.

How the Gradient Unfolds

The headline number is the 4.22% average, but the total ascent of 1669 m against a net gain of 1713 m tells you the road is not perfectly monotonous — there are small pitches and recoveries baked in, and the profile isn't a single clean drag. The spikes matter more: a max gradient of 12.23% means there are sections nearly three times the average waiting for you. On a climb this long, those steeper kicks arrive when your legs are already deep into fatigue, so they punch well above their length. Between them, expect long stretches sitting close to or just under the 4.22% mean — comfortable enough to hold a steady tempo, relentless enough to never let you truly rest.

Pacing Notes

On a 40.5 km effort, discipline beats bravado. Anchor your pace to a percentage of your FTP and hold it — resist the urge to chase the early kilometres, because at these altitudes your ceiling drops the higher you go. A sensible target for a climb this long is a sustainable tempo you could genuinely hold for well over an hour, leaving headroom for the 12.23% ramps without blowing apart. If you don't know your threshold, run the numbers through the FTP estimator first and build your climbing power target from there. Eat and drink early and often; a 1713 m gain to 3052 m is a long time in the saddle, and bonking here is a slow, grinding affair.

Gearing

Because the pain is duration rather than pure slope, gearing is about keeping your cadence alive for 40.5 km, not just surviving one wall. A 34×32 bottom gear is the sensible minimum for most riders on this profile, giving you a spin-friendly ratio to sit and grind the 4.22% average without cooking your legs. If you tend to climb at lower cadence, run heavy, or want insurance for the 12.23% pitches near the top — where thin air at 3052 m saps power — step down to a 34×34. The extra range costs you nothing on the shallow stretches and buys real comfort when the road tilts up.

Summary

Qumbel pass rewards riders who respect its length. Meter your effort, gear for cadence, and let the 1713 m of gain come to you one steady kilometre at a time.

Length: 40.5 km
Average gradient: 4.22%
Max gradient: 12.23%
Start: 1339 m
Summit: 3052 m
Net gain: 1713 m
Total ascent: 1669 m
Category: 1