Been awhile since I’ve posted here. I’ve got something of a silly question. I’ve seen many photos of Abrams tanks, particularly ones that have seen a great deal of wear and tear, where it appears as if the edge of many of the road wheels are white, or at least look like they have a white ring, just inside where the rubber tires meet the road wheel. I’ve not been able to figure out what causes this, but I’m going to hazard a guess. Could it be that these wheels have had the paint on the rims scraped off, and the ‘white’ is just the bare metal (steel or alloy) showing? Is that a reasonable explanation of these ‘white’ wheel rims? Or could it be something else?