Thinking fine, in center part of tire (vs side), and in the thick part of the tread. Steel belts in there. Is it holding air? What's the valley distance in the rain groove for comparison (valley floor to wear bar to even with adjoining tread)? The compound is fairly soft and rocks can sink in easily.
I get all kinds of similar with SC3Rs, compound softer. I wear them out to the cords typically. Still sometimes I decide nope, not risking it.
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2020 ZL1 1LE [Moroso SC Expansion Tank, otherwise stock]
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