[HiTech RedNeck]

I've never heard of tires being found full of oxidized rubber powder. It would seem to me that if this truly is a problem, some kind of coating on the inside of the tire would work just as well.

[Jubal Harshaw]

(1) The oxidized rubber does not fall into the inside of the tire; it's generally still in the tire matrix, but without the structural properties that helped keep the tire together before the rubber was oxidized. Perhaps I should not have used the word "dust" in this context; I was simply trying to provide a visualization of how the rubber fails after being oxidized. Your question illuminated the fact that I did a bad job. So, please forget the word "dust;" try "non-structurally stable rubber" instead.

(2) Tires do have inner liners, as well as antioxidants within the tires material itself. These are both subject to oxidation, and eventually wear out.