This convertible bicycle will accommodate from 2 to 10 people, depending on how it's configured. When the front and rear sections are paired up, it produces a tandem. As each section, that has a seat, handlebar and crank, is added, there is a place for another person. Needless to say, the center seats are reserved for the lightest riders.

Convertible tandem,
triplet, quad, quint, hex ...... up to 10 people.
This photo courtesy of Rob Templin of Second Summer Tours
Adventure Bicycle Tours to Exotic Destinations

This photo courtesy of Paul
Schmidt of Bikes and More, Gainsville, Florida
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