Only one size? I don't remember that detail but I do remember that it was on almost new tires and a lot of dealers called customers back to change their tires.
BTW I was a huge Beatles fan too.
Thanks, Burt.
Burt, the Firerocks you are thinking about were the ones that Ford put on the Explorer. Again, this was a Ford issue, but they went after the manufacturer (Like IH and the 6.0). To make a softer ride, Ford recommended the tire pressure to be lower than Firerock's minimum for that tire... causing excessive heat and tire separation.....
I know in the 70 Firestone had a tread separation issue that I remember Dad talking about....