I'm sorry but neither of your links sway me. Both are individual's repsentation of the facts as they see them. What I've attached is the actual NHTSA federal regulations and description of tire markings. In all cases the DOT/NHTSA identifies the tires
Speed Rating or
Speed Symbol and makes no mention of
Performance Rating
I think what we have here is a marketing name change from either the manufacturers or retailers to help the general public understand what this number means and I understand completely why they would want to do this.
Now, as some background, I'm an engineer that has spend a lot of time dealing with government regulations in the communications industry. This has made me very aware of using proper terminology as it relates to the regulations my systems must adhere to. I'm also a sports car enthusiast who has been enjoying and racing performance cars for roughly the last 30 years. If I seem stubborn then I guess I am but that trait has served me well in both my professional and personal life over the years.
I suggest we call a truce to this and get back to what we all can agree on, our love of Porsche's
