Bicycle
Schwinn’s Futuristic Aero-Space Concept Bicycle Design, c. 1960s
https://imgur.com/r/RetroFuturism/Si0pBk4
Robo
Nelia Chopiuk
https://www.artstation.com/artwork/nR2n9
Scooter
This concept painting of a "mono-scoot" personal transportation device was done by Richard H. Arbib in 1965. It is featured in the excellent book Driving Through Futures Past by the Petersen Automotive Museum. See also: No One Will Walk - All Will Have Wheels (1900) Gyroscopic Rocket Car (1945) Cars Detroit Forgot to Build (1950-1960)
http://paleo-future.blogspot.com/2008/07/mono-scoot-1965.html