This is bit of an older thread, but I had the same problem to having the rt615 tires mounted on my
stock black wheels. They had a hard time seating the tire on the wheel. They used crazy high pressure 80 psi to get it to seat. They also scratched one of my
black wheels. I returned the wheel and they repowdercoated the wheel. Took a week and a half and they did the repair no charge. This was at America’s Tire.