Yes, it gets much more complicated than that. First, there's the argument whether Sport LX and Mountain LX should even be considered as Exage groups. Sport LX and Mountain LX do not actually state "Exage" on the components or in the literature, unlike the other Exage groups. However, they belong to the same number series as the Exage groups. It appears that they were intended as low mid-range goups, intended to bridge the price gap between the entry level Exage groups and their existing mid-range raod and ATB groups.



Circa 1990 there were also two Exage groups for city bicycles, Exage Active City and Exage Comfortable City.
Member clubman mentioned Exage ES, which was a circa 1993 group intended for city/hybrid bicycles. The other Exage hybrid group that slipped his mind was the lower Exage LT group.


Finally, there's the possibility of foreign market Exage groups that were never marketed in North America. For instance, I was recently surprised to find that Positron survived into at least the very late 1980s in foreign markets, in the form of Light Action Positron. One questions why Shimano continued with Positron after they released SIS. Regardless, Positron appears to have been much more successful in some foreign markets, with more variants that we saw in North America. The same could be true of Exage.