I got 3 seasons out of my Stoptech rings. I'm replacing them now because they have some cracks which go over the top edge of the rotor. One of the cracks made it all the way into the vanes in the middle of the rotor...that one goes in the trash. The thin spider-webby surface cracks are normal though and mine have been there a long time (2+ seasons). I watch for the cracks to get to the edge of the rotor face - when they start to wrap over the edge, it's time for new rings.
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