Originally Posted by
thumpism
To be fair, there are also three-person and four-person (etc.) tandems.
Those aren’t “tandems”. They are triples, quads, quints, etc. One of my local bike shops has a sextuplet (if I recall correctly) over the front door of the store. Quads and quints were prevalent in the very early 1900 and very late 1800s before motorcycles came along. They were used on tracks for pacing which is what drove a lot of the development of motorcycles.