>>1569628>>1573202I let the feat of German engineering known as Kwiggle slip my mind.
It uses a Dahon style lower fold, but combines it with a unique upper folding mechanism which relies on a rod under tension to support the rider's weight.
It has up to six speeds with a custom three speed rear derailleur and two speed Kappstein Doppio drive which has a higher gear ratio than the more well known Schlumpf drive.
https://www.youtube.com/watch?v=tmyzVHfYa64https://www.youtube.com/watch?v=rvQP4OFw8yA