I checked my 80s Motobecane Interclub tandem; a low-to-mid level bike with many similarities to the Danish Lejeune. Mine has 27" (630) Weinmann concave rims rather than 700C (or 650B) and I was told by the seller that his son had bought it second-hand in France, so I think the wheels are probably original equipment.
David Bean
Arlington, MA USA
beandk at are-see-enn dot com