The International Six Days Enduro (ISDE) was first held in 1913 and takes place annually – apart from interruptions during the two world wars. Originally titled the International Six Days Trial (ISDT), the International Motorcycling Federation (FIM) updated the name of the event in 1981, when the term Enduro was popularised. The competition was held primarily on roads in its early years – although the roads of the era were often just as challenging as today’s trails – and were designed to test both the reliability of machines and the skills of riders. Today’s ISDE is primarily an off-road event that traverses some of the world’s most challenging terrain.

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Photo: Competitors are pictured ahead of the 5th edition of what was then known as the ISDT in Stockholm, Sweden in 1923
Credit: © FIM Archive