Damaged tyre safe to pump up?

[CapriRacer]

Originally Posted by Eddie25

the tyre has been running like that at 2.4 bar for a year and a half now. it never rode completely flat where the rim touches the ground. it ran about half deflated.......

I think the abrasion on the sidewall says otherwise. I think it says the tire was run very nearly flat at some point in time.

But you do what you want to do. You asked for advice and you got it. Take from this discussion what you will.

[Fat Charlie]

It looks more to me like the sidewall got nicked by something with a bit of an edge. Our minivan tire had a similar one, just larger, and wasn't deflated. A squared-off curb, a sharp bit of trash, something like that was my guess.