Chinese WW parts galore.
Again, unbelievably cheap (and light) square taper crankset+BB combo. They may be super flexy, but should be fine for my wife.
Carbon flat handlebar cut to 530mm length.
31.8mm carbon seatpost cut to 550mm length.
Unbelievably cheap copy of san marco superleggera saddle.
I have successfully used inline brake lever for many of my builds, and I chose another pair as the main brake lever here.
DT swiss remote lock lever is used as an ultralight shifter.
Small wheels are used to support the bike when folded. I custom designed and 3D printed mine.
And I decided to design custom tensioner too
And finally the pusher assembly (which moves the guide pulley around, in short a crude derailleur)
, but it's winter..) 
)
