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Bill,
Due respect to your status as resident Pelican guru, but the indicator in your picture marked "A" just shows where the wear indicator bars are - or at least, it does on every tyre I have owned. The wear indicator bars show minimum safe tread depth. The "A" does not IMHO indicate where you should see scuff marks indicating under/over inflation as per the chalk test. Sure, you could use them as a rough guide but this is not their primary purpose.
HTH
Richard
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