My tires had a similar wear pattern..
I put on new tires and then I brought my car to the Porsche dealer for an alignment..
I was on the other end of the specs,so they realigned to the other end within the specs..
No problems with tire wear like that anymore..

 

mine ( ps'2's ) wear rears at 6k miles also. with x73 alignment/lowered. no gettin' around it. 1.5-2 sets of rear tires are an annual expense.

 

Yeah but you are slower through corners. :-)

 

This maybe true but I am not a track road racer, so I am Ok with that..

 

you asked a question and i gave you the fix.. if you are worried about tire wear dog bones are the only way to adjust camber unless you get adjustable control arms.. which cost in excess of $1800

 

Hey Eugene, I remember you were looking for a new set of tires a little while back; are these the new set?

 

Nope. These are the tires that I got shortly after I bought the car. I have a nearly new set of MPS2s on my GT3-style wheels that I got from the PCA Group Buy last year.

 

Thanks for the tip on the fix. I had thought that I wouldn't hit the limits of adjustment unless the car is lowered.

 

Wow, you sure go thru them fast.

 

The same thing happened on my Supra when I went single turbo (going from the stock 325lb.ft. of torque to 600lb.ft. of torque).

The cure was to add a little more toe in. In theory, the rear was squating so much more, it was causing excessive toe out under acceleration.

Since the suspension layout and geometry are different on the 911 versus the Supra, I don't know if this will change anything. Typically wear on the extreme edge of a tire is toe related.

Just my 2 cents,
Steve