911Raider

My rear tires are wearing on the outside, the driver side more than the passenger. The alignment seems pretty good, but now I wonder.

Is this under inflation, alignment, camber? I check my tire pressures very regularly, but every gauge gives a different reading. I use the same gauge but perhaps it’s not calibrated correctly. It’s a digital gauge. Could quick starts and speedy cornering do this? I’ve had several long days of winding roads and getting after it pretty good, not sure if it was enough to do this, however.

Cuda911

My vote is camber.

jeffleept

Underinflation typically will wear both sides of a tire.
I agree with probable camber too. Based on your wear up the lateral rib you probably drive like it's a 911. May need more negative camber.

ipse dixit

Is this your first 911?

911Raider

2nd, but only had the first one a year, have had this one a year. I’ve never had to buy tires, yet.

ipse dixit

What generation?

I am thinking that the rear wear pattern may be a result of Porsche torque vectoring, which was only introduced to non-turbo 911s beginning in the 991 generation.

(The 997.2 TT/TTS had torque vectoring as optional upgrade, but not the "regular" 997 911s)

911Raider

991.1, 2014 911S

z168

wouldnt the positive camber wear the outer edges of the tire first?

vanlieremead

With our alignments, the inside should be the one wearing, not the outside. We like our tires out at the bottom for corning when weight is being shifted. This leads to wear on the inside for straight line travel. I'd say there is an alignment issue as wear on the outside, unless the car has been continually corned hard, shouldn't be.

996scott

yes, negative camber will wear the insides faster. Most of my 911s have had more negative camber set up and have usually worn the insides more.

Norge911

If you don’t do canyon driving at high speed, ie above speed limit nor track driving, auto cross, then ask dealer or alignment shop for 0.5 camber (lowest you can go). And zero toe. I.e. square set up.

this should give you 10,000 miles more on your tires.

Tommy L Garage

Its neither. Your pzero tires are dry-rotted and need to be replaced. Go with Ps4s

996scott

that's possible, but why would dry rot cause excessive wear only on the outsides?

Joec500

Did someone at some point try to reverse rotate? i.e. swap tires from one side to another?

Southbranch

Is it possible that the passenger side tire is a newer replacement?

Diagnosing tire wear: