The Ninja ZX-6R is a sterling example. This midsized street bike might be smaller and lighter than some of its larger cousins, but it's a powerful representation of Kawasaki's engineering.

The 600cc(ish) supersport sector used to be one of the most hotly contested segments in motorcycling, with screaming, apex-hunting machines like the Kawasaki ZX-6R fighting it out for supremacy ...