Copenhagen (version of) Dursley Pedersen is another truss triangulated frame design ..
https://www.google.com/search?q=Cope...MAHbTMsuc6M%3A

I saw one built where all the tubes, But the chainstays, Bolted to the BB shell, so they all could come apart for compact travel .. http://www.dursley-pedersen.net/imag...copenhagen.png

& 1 had 20" wheels to further ease the smaller Packed size