In the late 1800s endurance cyclists used to join unsupported group-rides to cover long distances in an established time limit to prove themself “audax”, brave in Latin. During the GranGuanche Audax, the time limit is set by the ferry leaving for the next islands. The event follows the classic rules and principles of unsupported ultra-cycling events, but in the spirit of Audax, participants are here allowed to ride in a group and draft each other.