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Does anybody know what these are on the 912's? What indicates its time for rotation?
I didn't know the tires had that feature but they do called Rotation Wear Indicators. I think they may be little holes on the treads that allow for when you can rotate tires.
I wonder how you know when to rotate them. Do the holes disappear and reappear etc...?
There might be a few holes at various depths, one set wears then down to the next level when the next rotation comes up, not as deep as tire wear indicators- then change the whole tire.