Stephan Henrich's "Infinity" - Wheeled Bicycle Concept, a bit like that WW2 BWM caterpillar tracked motorcycle

But though this is a lot to think on, it seems that it hasn't went anywhere in 2 years, so, it's nothing more than a idea waiting for investors to pay for the R&D, machined parts, etc. 

 

https://mashable.com/video/infinity-bike-stephen-henrich