>>1485112only used because they were cheep and no one wanted them
modified with motor bike parts later on to make them more usable
at some point the cost of destroying 5 old bikes was the same as haveing one custom made
so they copyed the geometery they like .eg schwinn excelsior
and that got copied into early 1980s MTB
only towards the end of the 1990s did the geometry change much from that
>tldr 1990s ridgid mtb 