Tire disintegration?

[montenegro]

I left my M3 parked for 8 days in Los Angeles and upon moving it, there was this black sand-looking residue under each tire. The weather wasn’t particularly hot.

Has anyone had this same issue?

 

[Avid]

That's the asphalt under the sand layer coming through.

 

[montenegro]

That's the asphalt under the sand layer coming through.

Sorry, not sure i follow.

 

[Avid]

There's a sand layer on top of the asphalt, heat and weight of the tire pressing down on the surface forces the sand to press in and outward exposing the asphalt beneath. No worries as it relates to your tire. Drive on.