Sean Gallagher and Benjamin Schuessler have set a Fastest Known Time on the Great Wall of China, finishing the endurance ride in just under 83 hours after covering 2,457 kilometres. The pair beat a previous mark of 10 days on a route that cuts across some of China’s most demanding terrain.

For Gallagher, the feat was as much about the journey as the stopwatch. He has lived in Beijing for 20 years and said he always gets a window seat as a photographer, which gave him a long view of the mountains, deserts and Tibetan Plateau on a two-and-a-half-hour flight that helped him grasp what lay ahead. By the time he and Schuessler rolled out, they had already committed to an eight-day target and planned to ride roughly 300 kilometres a day.

The route itself is no small backdrop. The recognized endurance line begins at Jiayu Pass and runs about 3,000 kilometres to Shanhaiguan, tracing a structure whose fortifications were built over more than 2,000 years and whose earliest sections date to the 7th Century BC. The wall’s full span stretches across more than 21,000 kilometres of bricks and mortar, which is part of why even a fast crossing carries a weight beyond cycling.

Gallagher and Schuessler, both members of the Beijing West Cycling Club, started in blustery conditions at 5,500 feet above sea level. Gallagher said the effort was not a race and was done for the experience, with a focus on seeing as much of China and the wall as possible. But once the target was set, every day had to be planned around it, and he said he genuinely questioned whether they would make it to the end.

That uncertainty came from the sort of risks that do not show up in a results sheet: accidents in the middle of nowhere, mechanical failures and the possibility that something could go wrong far from help. The pair were unaware at the time that they had set an FKT, but the record now gives their ride a clear place in the endurance history of the Great Wall of China. The unanswered detail is the one endurance riders usually remember best anyway: the exact moment when a long ride stops being a plan and becomes a finish.