I think about it . and then I adjust things , Myself.



Other than Bike Friday , no folding bikes are made in more than just 1 size

then you tweak the adjustments

(though older Mk2 Bromptons were shorter than the Mk4 are Now )

Saddle height, Telescopic seat-posts You adjust it every time you Unfold it .

BiFri hinged seat masts are different in that regard.



some just have bigger wheels

Having [non trivial] Bio-Mechanical issues? a Sports Physiologist with a Cycling Specialty Study, may be better

than a Fit Kit done by a Kid in a Bike Shop.