Originally Posted by NoHyperbole

I've got almost the exact same car and situation that you describe.

I also have a 2014 Touring/Sport. At about 7,500 miles, I added Swift springs and 20/25 spacers (as well as SPC front and SPL rear camber arms). I retained the stock RE050 tires as well, and I do have front and rear Eibach sway bars.

About a month ago, at 11,000 miles (currently 11,500 miles), I decided to check the tires carefully to see how they have been wearing, and I was surprised to see what looks like greater outside tire wear than inside, which you wouldn't expect. However, my outer tire wear is more pronounced on the front tires than on the rear tires, which is in contrast to your experience. The uneven wear on all tires is not excessive, but it is noticeable.

I have maintained the tire pressure between 34 and 35 psi the entire time. I have had the car aligned three times to my specifications since the springs were installed (only 4,000 miles ago). My front camber has remained at -1.9 to -2.0 degrees the whole time. Similarly, my rear camber has remained at -1.6 to -1.7 degrees. Caster is an even 6.1 degress on both sides. The only variable in my alignment is toe. I have had it set to +.05 front and +.09 rear each time, but it apparently doesn't hold too well. The toe values are way off (sometimes one side negative and one side positive) and have to be reset.

So I'm just as confused as you are regarding the outside tire wear, especially on a daily driven street car with relatively a lot of negative camber.

If anyone has any ideas about the cause of this pattern of tire wear, please chime in.