Crossing the Trans-Himalaya: 12 Days Above 4,000 Meters

What it really takes to ride the roof of the world — altitude, ice, and the machines that survive it.

Day one starts at 2,000 metres, and by nightfall the air is already thin. Over the next twelve days our convoy of eight riders will cross five passes above 5,000 metres, where the engines lose a third of their power and every breath is a negotiation.

Altitude is the great equaliser. It doesn't care how many kilometres you've logged at sea level. The trick is patience — ride slow, drink constantly, and give the body two days to adjust before the first big climb.

The machines matter as much as the riders. Fuel-injected adventure bikes with re-jetted mapping hold their composure where carburettors would drown. A support 4x4 shadows the group with spares, oxygen, and a medic who has done this a hundred times.

By the final pass, the reward is total: a horizon of white peaks, prayer flags snapping in the wind, and the quiet knowledge that you rode somewhere most people only ever fly over.