Originally Posted by
fietsbob
Generally the folding bike companies make one size product.. Brompton has the taller mast for bars and seat, but one frame.
As you mentioned above, Bike Friday does customize their bikes. At least some. Different seat mast for different sizes. I assume they have a couple of lengths of top tubes that they use, and stems of your choice.
Several different models depending on compactness or how racy the bike is.