50# 1963 Huffy Daisy town tandem
40# MT30002 Cyclecross tandem
35# teesdale desert tandem
24# 11oz for the Paketa
That's all in with a lot of added weight already in that total
3 bottle cages, pedals, 44mm straight head tube, Dura Ace Di2, internal battery
two tone paint adds to the weight rather than a bald bike
This is with my "heavy" wheels +- 1,500g (Alchemy hubs, Kinlin rims)
25mm tires
180mm "heavy" 230g stoker stem.
Right side belt allows lighter single bike cranks
The bike could be sub 22# but not with Di2, nor with the deep gearing for the Rocky Mountain, and our other needs for distance racing.
The photos are from a professional shoot, the others are in my garage...