66. Six Days Enduro 1991 CSFR Považská Bystrica

The competition took place in Czechoslovakia for the tenth time and, after the 52nd (1977) and 57th International Six Days (1982), for the third time in Považská Bystrica. 360 riders from 21 FIM motorsport federations were registered for the competition. Teams from 16 and 11 nations competed for the World and Junior World Trophy, respectively. In addition, 19 factory and 65 club teams participated. Germany and Switzerland each participated in the World and Junior World Trophy. In addition, nine German, five Austrian, and one Swiss club teams participated. Special stages during the first five days of racing included a motocross test and an acceleration test per lap.