The Stone Xtri is part of the Extreme Triathlon Series, a group of extreme triathlon events around the world where athletes can push their boundaries and be part of an unforgettable experience. Each event is unique, with varying terrain, distances, challenges, and characteristics – a triathlon designed for triathletes, by triathletes.

We have combined our passions, dreams, and efforts to create a series that focuses on the athletes with a close-knit family atmosphere. The Extreme Triathlon Series is an experience like no other, giving athletes the chance to achieve the impossible.


PIRENE - Xtreme Triathlon

Austria eXtreme Triathlon

Winterman Xtreme Triathlon

Knysna Xtreme Triathlon