The annual CMCdN is organized by the European Classic Motocross organisation (ECMO) with the format of the event based on age and teams of four riders, each age group having to compete on bikes from a specific era. There are three age groups, 40 plus on Pre72 bikes (as of 2009 the age limit was reduced to 35), 50 plus on Pre70 and 60 plus on Pre65. England hosted the CMCdN in 2006.