As an aside, my parents (late 70s) have an early model tandem pro ( https://www.terratrike.com/tandem/tandem-pro/ ) with substantial customizations (electric assist, mountain gear switch allowing them to change gears to a granny gear when stopped, solid aluminum (no spoke) back wheel).
They're hung in the house in the winter as available vertical space. https://imgur.com/YBnnwVO In the bottom center you can see the back wheel.... digging I found an earlier version of it while it was under construction (a previous winter) https://imgur.com/T9ME3lp
As an aside, my parents (late 70s) have an early model tandem pro ( https://www.terratrike.com/tandem/tandem-pro/ ) with substantial customizations (electric assist, mountain gear switch allowing them to change gears to a granny gear when stopped, solid aluminum (no spoke) back wheel).
They're hung in the house in the winter as available vertical space. https://imgur.com/YBnnwVO In the bottom center you can see the back wheel.... digging I found an earlier version of it while it was under construction (a previous winter) https://imgur.com/T9ME3lp