It’s the Tour de France’s Biggest Secret—and There’s an Army of Nerds Trying to Uncover It

July 17, 2025

For more than 110 editions, the route of the Tour de France has changed every year. And for the race’s organizers, the Amaury Sport Organisation, the details of this 21-stage summer extravaganza are planned in the shadows. They only reveal the broad strokes of it during a lavish ceremony in Paris every October, before publishing the details of the roughly 2,100-mile course in the spring.

However, there’s an army of cycling nerds out there doing its level best to work out the route ahead of time. msn