Am 10.07.2020 um 23:00 schrieb bob prohaska:
A question posed to the New Scientist's 4 July issue posits
that multi-seat bikes have a total weight advantage over
solo bikes (per seat), asking at what seat count the weight
advantage per seat fades away.

Initially, I thought the premise of the question mistaken,
but now I'm curious: Is it true that a modern tandem weighs
less than two solo bikes of the same total carrying capacity?

Let me put a goalpost he
https://onlinebicyclemuseum.co.uk/19...er-swb-tandem/

The Claude-Butler USWB I used to ride is advertised as 45 lbs including
mudguards (mine was from the 1950's with IIRC three-speed deraillieur
gears, not the original 1938 single speed).