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Chages in tires are usually due to excessive wear (seem a bit too early for your S03s) or an abnormality. Soft tires are made of multiple rubber-compounds each of unique chemical properties. If you noticed on your previous tires, as they aged, they tended to lighten in color and take on a "gritty" look. This is basically getting into a "new" chemical layer. But again, this sounds way to early for your tires starting a chemical breakdown. I would take them back to the tire dealer.
How is the performance (and ride and noise) of the SO3?
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