One of the chassis team's goals was increased stability, and you can feel it when it comes time to initiate turns at track speeds. This bike is a claimed 6.6 pounds heavier than last year's ZX-6R, making it the heaviest of the current middleweights. The underseat exhaust contributes to most of that additional heft. Engine castings are also thicker and heavier to handle the increased power, while the slipper clutch adds weight, too. That said, the wheels and tires are lighter than before, as are a host of other components.We rode our final sessions on Bridgestone's latest 002 race tires, and the stock suspension can easily handle stickier rubber, at least at Almeria, which is smoother than the average U.S. track. While the 599cc ZX-6RR has a mounting boss for a steering damper, the R has neither one nor seems to need it.