Sometimes it is nice to read or watch what others in more enlightened countries think about & interact with their bicycles-especially the collapsible (folding/separating) kind. Here is one rather interesting example:
"........Only original folding bikes from the seventies used identical or current models. There are no straps or clipless pedals are allowed.
20 inch wheel size, crank length max. 170 mm, original handlebars, original saddle or similar.
Front smallest sprocket 36 teeth, rear gear teeth greatest 24th
Coaster brake and front brake, 1 speed and Duomatic allowed.......PS
And please do not come to me with the whining that this translation is too difficult. I even already left with a non-folding bike converted 44/19 and was able to drive all the distance. If there is still not enough, the translation despite the smallest force, it is not a tragedy to push various sections. Folding bikes like it when you push them!......"-
Or the bike pushes me! I don't know how they could manage with the above original specs these bikes came with. I needed to add an 2 speed kickback hub at the bare minimum on my own German made 1970s separating bike to manage all the rolling hills surrounding the area I use my folding/separating bikes in.