Folders , folders and more folders.
When I decided to look into folding type bikes. I thought their would be a couple dozen Mfg's....maybe.
Till I found this site....Holy hinges....look at this list of JUST folders.
...and that's NOT all of them.
Ya learn something everyday....
Here's another kool site,
It's about a specific folder, but the info pretty much relates to other makes. It's fun reading nevertheless.