The Curve in the picture has Schwable Marathon Racers (no need to guess -one can read the markings on the tire), most probably in ISO355.
Compare the tire and rim thickness to the Brompton's 349s. I think there's no way those are 355 (*bigger* than the Brompton). Those are 305 tires, same as the other Dahons. Which makes this one heckuva small bike.