Uneven Front Tire Wear Question

So I noticed, today, that my front tires are wearing unevenly. They're four year old PS2s that came on the car when I bought it in May. There are three grooves, and while the outside and middle groves are running ~6/32, the inner groove is running ~5/32. In other words, there's a distinct 1/32 difference. On the rears the difference between the grooves are minimal (i.e. fractions of a 32nd). It would seem that I need an alignment, but I just had the front suspension re-done about a month ago, and the shop (which has a good reputation) was supposed to have done an alignment. Anyway . . . anyone have any thoughts?

Always get a print out of your alignment. For performance driving, you'd want a slight toe out in the front. Porsche considers this within alignment spec, so many alignment shops may leave it at that, unless you specify exactly what you want. Toe that isn't perfectly straight can cause uneven wear. But a more likely culprit is camber. Camber should NOT be straight. Cars should have a slight negative camber so that the tire levels out upon cornering. If I remember right, Porsche allows up to -2.5 degrees of front camber as being within alignment, which is enough to cone the tire as you are describing. A huge misconception is that negative camber wears through your tires more quickly. It wears through your tires at the exact same rate your tires would usually wear through. It just moved the main contact match of the tire inwards or outwards. So in reality, the inside of your tire is not wearing quickly, the outside of your tire is wearing slowly. But I'd also like to ask what suspension parts you had replaced and what mileage your car is currently at. You could have worn bushings that are allowing play in the wheels.

Thanks for this information. Although I don't (at least not yet ) track the car, I do drive it "spiritedly", and I did let the shop know all of this. It's good to hear that perhaps this "problem" exists only in my mind because I'm an idiot. To answer your question - the car is now just over 62,000 miles. The suspension work was both struts, along with the associated mounts, bearings, and bellows.

On all the sports cars I've owned, I've always paid attention to the inner tire wear. As long as you're still getting decent mileage out of the tires , then I wouldn't worry too much about it. Still worth having your alignment checked and getting a print out of the numbers, just to confirm you are within spec. Especially since new suspensions can settle over a few weeks.

I'd say that this situation is normal on sports car. The front camber and toe-in from the factory will promote inside wearing out first. Nothing wrong with that. Just don't forget checking the fronts inside once in a while. I once found out I can see cords there while the outside was just severely worn

so you purchased a used car a few months ago and it came with four year old tires ? do you know how the previous owner drove the car? did your alignment shop tell you the alignment specs for pre and post alignment? If it were my car, I would get new tires , get a good alignment that fits my intended use (a good alignment shop will ask if you), and get the suspension checked for anything lose or worn. Then I would check the tire wear on this set of tires . Until then, there are too many unknowns.

The OEM rubber bushing that sets your caster is worn. Install these: https://www.elephantracing.com/porsche/boxster-cayman/caster-adjuster-for-986-987/ 4 wheel realign. Have the fronts set to .5 negative camber, toe to OEM and most important to deal with crown in the road, the right caster should be 1 degree more than the left.