Modifications
During mass-production there were some improvements of the ZiU-9 design. Any major change is designated by a letter after the '9' or '682' index:
- (1971) ZiU-9 - first prototype vehicles
- (1972) ZiU-9B (ЗиУ-9Б) - first large-series vehicles
- (1976) ZiU-9V (ЗиУ-9В) - major improvements in electric equipment
Read more about this topic: Zi U-9