What if there are no restrictions when building the ultimate superbike? Then you'd get this, the Kawasaki H2R. Still the classic concept of a four-in-line, but in this case with a supercharger. One look at the performance says it all. With 326 hp for 216 kg ready to ride, you get a power-to-weight ratio of 1.5/1. By comparison, the Bugatti Chiron, with its 1500 hp for 2200 kg, only achieves 0.68 hp/kg. The Kawasaki H2R is without a doubt the fastest production bike available, and the only sensible thing is that it is not street legal. It is also not welcome in any racing class, so this is just Kawasaki letting loose because it can. The question of how this can be surpassed arises once again, but that same question has been asked since 1969. With more than 55 years of evolution in Japanese superbikes, the answer is: with the next superbike.