Halbrad (that’s “Halfbike” in English)
by Felix Kruschardt
Started in 2016
This bike has many similarities to a skate bike. While there is a handle bar under the seat, it works a caster wheel. The website is in German but the article in New Atlas is in English.
The half wheel is actually a bicycle!
It has 2 brakes that are independent of each other and 2 gears.
It is always ready to drive, saves space and can be taken with you in public transport free of charge.
New article on it at New Atlas