Clavery Sets Unsupported 404 km Jura Crossing Record

Erik Clavery set a new unsupported fastest known time on the Grande Traversée du Jura, covering 404 kilometres with 15,000 metres of climbing. The former world trail champion finished in 3 days, 20 hours and 32 minutes, carrying all his own food and gear.

Four days, one backpack

He ran entirely alone, without pacers or outside help, relying only on public fountains and taps for water.

Forestry work and closed paths forced him onto minor detours five times. None of the diversions proved significant.

"The route was completed entirely unsupported," he wrote in his FKT report. "I carried all my own food and gear without any outside assistance or pacers."

A champion’s quiet record

The GTJ run adds to a long list of unsupported crossings. In 2020 he set a mark on the GR10 across the Pyrenees, then added records on Normandy's GR223 and the Nantes‑Brest canal. He won the world trail title in 2011 in Connemara and holds the French 24‑hour record.

This effort carried a deeper purpose. "You were the fuel to the fire that this adventure became," he wrote. "Sam, I hope I kept my promise."

Another French ultrarunner improved the GR20 record in Corsica that same weekend.