What does the size of sport bike tires mean?
For example, on my r6 it says 180/55ZR 17. What's the difference between 190/50ZR 17 and 190/55ZR 17?

And any suggestions for rear tires? I do some street riding, but I wanna get on the track more. Last time I was there my rear tire lost traction and i low sided. I was thinking of the Michelin Power One....

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