We took them off a couple years ago and brought them to a shop to replace the four tires.brought them back home and installed them again and that's the last I had done anything with it. I left maintaining them to my father. Unfortunately he isn't the greatest at checking the pressure and I'm sure that had something to do with it.
I dismounted all four and spun them around and then pressured up to 90psi. They are F rated and will go to 95psi.
A combination of under inflation and suspected overloading, (I'm always telling mom to leave a few more things at home) resulted in a slight wear on the outside rib of the tire.
We will see what happens this season.