Perrin
OK I know you have been waiting for me to write in, 40 some years in the line game and there is plenty of time left in that tyre. the makeup of a A/C tyre as I have seen at the manufacture will allow it to go right to no thread all the way around and still be safe, I have never let a tyre go like that and more wear than that and had a failure. I rest my case.
Keep they flying I will try and keep out of the wild bits of the golf course.
Peter