Ok but actually, what are they for?
If I had to guess, they either help grip the road or help smooth aerodynamics around the tire.
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they might be vents, to allow air to escape the mold while it's filling, so there aren't voids among the tread detail
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✅ Correct
Oh neat, so then the rubber fills into them once all the air gets pushed out and forms these little tire cilia.
This is exactly what they are.
