A C90 is a motorbike.....classified not only by engine size but specification.....it has been designed with the petrol tank and engine to be situated low and between the two LARGE motorcycle wheels....this makes it coner brilliantly and makes ita fun motorcycle....they are even tuned up to get a whopping 100mph out of them as I do this for a living.....The bikes of the future which I also happen to design ....say the Honda Blackbird for instance is just a suped up design of the C90....it was the forefater of the modern superbike.... so how would you repond to that.....if you fancy yourself as a designer then please hqave a go