Originally Posted by
shmuelyosef
What always happens to any extrusion (i.e. the rolling tools) is that the tools wear (slowly) and the regularity of the dimensions deteriorate. This generally makes it more difficult to make the hoops round and the detail of the sidewall capture region 'rounds off'.
Yes, that stuff also degrades! And if the economics aren't good enough the factory won't shell out for a new round of tooling, and we might be looking at the death of a great component. Saw this stuff in the auto industry.