The GSX-R/4 concept let Suzuki show a way of combining its motorcycle and automotive expertise into a small sports car.

The differences between two- and four-wheeled vehicles run so deep that their engines effectively cannot be swapped using off-the-shelf parts. Fitting a motorcycle engine into a car, for instance ...

These motorcycles quite literally have car engines shoehorned into their frames, with varying degrees of success and ergonomics.