Here's the center tread of the Metzeler Z8 on the back of my Versys 650. It seems to have worn to a rubber layer beneath the tread. I inspected and this is the worst wear spot--no cords showing anywhere. Any idea how many more freeway miles (or kms if you prefer) it's good for before cords show? Before it blows? I have various options to deal with it. None involve not riding it at all. Sorry if I put this in the wrong forum.