I had new tyres sorted yesterday. 4 Pilot Michelins. When they took the old Pilots off every single one had its steel rings exposed on the inner rim. I hadn't noticed as you tend to look on the outside when checking tyres and the inner rims looked like someone had taken a knife and sliced off the angle. The tracking was clearly fecked. Anyway, I always think it's good to get the maximum wear out of something!