Khardung La

Overview

Khardung La is a genuine hors catégorie monster. Over 34.4 km it lifts you from 3223 m to a summit of 5353 m, a net gain of 2130 m at an average gradient of 6.2%. The total ascent, accounting for every small dip and recovery, is 2088 m. Those are numbers that put this climb in the very top tier of what a road bike can face: extreme length, extreme altitude, and an average that never lets you truly rest. The 6.2% figure sounds moderate on paper, but stretch it across 34.4 km and multiply it by the thin air near the summit, and you have one of the hardest sustained efforts in cycling.

How the Gradient Unfolds

The defining feature here is the mismatch between the calm average and the violent peaks. At 6.2% mean gradient, this reads like a long tempo climb — but the maximum pitch hits 26.92%, a wall steep enough to stall a rider outright if it arrives at the wrong moment. Expect the road to alternate between long, grinding sections that sit near or just above the average and sharp ramps that force you out of rhythm. With 2088 m of total ascent against 2130 m of net gain, there is very little false flat or descent to recover on — nearly every metre gained is metre you keep. Plan your effort around the ramps, not the average.

Pacing Notes

On a climb this long, discipline beats bravado. Anchor your effort to your FTP and hold well below threshold for the opening two-thirds; the altitude alone will erode your ceiling as you climb toward 5353 m, so power that feels easy low down will feel far harder near the top. If you do not know your threshold, run the numbers through the FTP estimator before you commit. Save a small reserve for the 26.92% pitches — they are the moments that end days, not the steady 6.2% grind. Fuel and drink continuously across the full 34.4 km.

Gearing

Gear for the ramps, not the average. A compact 34-tooth chainring paired with a 34×32 low gear is the sensible minimum for most riders tackling a 26.92% pitch at altitude, and going one step further to 34×34 buys valuable insurance for the steepest sections when your legs are 30-plus kilometres deep. On a 34.4 km HC climb with this much total ascent, the extra range costs you nothing and can be the difference between spinning over the top and walking.

Summary

Khardung La demands respect on every axis: length, altitude, and those brutal 26.92% spikes. Pace conservatively, gear generously, and treat the 6.2% average as the floor of your suffering rather than the ceiling.

Length: 34.4 km
Average gradient: 6.2%
Max gradient: 26.92%
Start: 3223 m
Summit: 5353 m
Net gain: 2130 m
Total ascent: 2088 m
Category: HC