The Kawasaki J Concept isn’t the first example of a leaning mutli-wheel vehicles that you ride upon, as I’m sure you have all seen the similarly themed Yamaha Tesseract by now. Neither a motorcycle, nor a quad…we would even be reluctant to call the Kawasaki J Concept a trike, as the riding experience is complete different from other three-wheelers (technically it has four wheels, though the two rear tires act as one).
As such the J Concept and Tesseract exist in a class all to themselves, and that is probably the point of these concept machines: to explore new forms of vehicle recreation and transportation.
The design as it looks now, doesn’t seem too practical, but the idea of a completely adjustable riding position sounds like a concept with some merit — a sport machine for when you want to go fast, an upright sitting position for when you want to cruise. Hmm…