Audax is a cycling sport in which participants attempt to cycle long distances within a pre-defined time limit.
Audax is a non-competitive sport: success in an event is measured by its completion.
Audax has its origins in Italian endurance sports of the late nineteenth century, and the rules were formalised in France in the early twentieth century.
In the present day, there are two forms of Audax: the original group-riding style, Euraudax, governed by Unions des Audax, and the free-paced (allure libre) style usually known as Randonneuring, governed by Audax Club Parisien.
The original form is mostly popular in France, but also in the Netherlands, Belgium and Germany.
Randonneuring is popular in many countries including France, Great Britain, Singapore, Australia, Canada, the USA and China.