Our 12 X5 just hit 20k miles on OEM Michelin RFT.

No more than two months ago, we have checked the tires before a long trip and each tire was ok; But just yesterday, we have noticed that both front two tires have some damage on the surface, however the rear two tires are still in perfect condition.

It appears the materail is falling off from surface on those two front tires, there is no single scratch on rear tires. We mostly drive in the city/highway, sometimes also drive on the paved roads of the state park and national park, but only in very short distance and only a couple of time, never drive off road.

I took some pictures, one is the front tire, the other is the rear one.

Does anyone have opinion what happened to those tires? can this be covered by warranty?

I would like to get some suggestions before taking it to the dealer.

Thanks

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2012 X5 35i: Hitch installed; Coded;