I'm a huge fan of the Michelin power cup Evo on my zx6r that's setup for racing. I put Pirelli Sp supercorsa on my 959 when I took it to the track and they were awesome. Last year I ran the Dunlop d212gp and the Michelin is better for me. The gpa needs lots of heat and it's a very stiff tire. I know a guy who runs 190/55 power cup evos on his 899 without any problems btw. He's an instructor for STT