I'm curious why needle bearing kingpins? Seems destine to be an issue or fail. Hardly seems necessary. Didn't know kingpins needed improvement. I don't know.
Lot's of variables.
I've bought all my tires from coker. Never had this issue.... ever
Just sharing info, you decide if they need a shave. Maybe an oddball issue?
https://www.jalopyjournal.com/forum/...#post-12712697