Both rears on my 99 Carrera are heavily worn on the inside and far less on the outside. Normally, I'd assume alignment problems, but since they both show the same wear pattern, I'm wondering if it might be the suspension (original) drooping at the rear causing this.

Any suggestions on how I can tell?

 

It is probably the camber on the rear wheels, the standard is -1.0 ° +/- .15'. Your aligment may be more agressive than that. Here is a link showing the stock alignments.

https://rennlist.com/forums/showpost...55&postcount=3

 

You are not driving the car hard enough. A couple DE's should fix your issue.

 

exactly, that will even them out just fine. But really folks, the normal alignment sets the car up that the insides wear faster than the outsides.

 

totally normal. this car eats rear tires. start saving for that next set.

 

Tiptoeing thru the corners? It's normal. Try pushing it thru some turns aggressively, it'll even out the wear. Mine wore the opposite, outer 25% looked like a slick, center was the least worn and the inside 20% still had a little tread.

 

Totally normal with stock alignment, negative camber. You can trade aggressive handling for improved tire wear by reducing negative camber. But what fun would that be?

 

toe-in. (Incorrect toe-in results in accelerated wear under corning conditions -- and this includes all changes in direction which under normal driving conditions occur almost continuously as the driver makes slight corrections to the wheel to counter car drift from road and wind affects.)

My advice is before you go many miles on new tires to have the car's alignment checked by a shop that knows Porsches and their very special alignment needs.

With proper alignment, which includes quite a bit of negative camber, as we've all seen when following a Porsche, rear tire wear should be even across the entire tread surface, although the center portion of the tread can show slightly more wear than either of the edges. But edges should wear identical.

Sincerely,

Macster.

 

Thanks.. Sounds like I need to go to a porsche shop to double check the alginment. And then start driving more aggressively.. :-)