ttAmerica RoadsterAWD

So went to take off rear wheels and was surprised at the passenger side rear tire. It was worn down to the cords and the metal mesh showing thru! Scary. Since my car is lowered quite low I could not appreciate the inner tire when I stooped down to look.

For those of you with non-track setups, what is the character of tire wear in the rear? Mine wore down to the metal and still had maybe 3mm on the outside. Think I have too much camber for non-track car or is this appropriate wear pattern??


thanks, and looking forward to your answer.

Bill P.

Same thing happened to me. I actually flatted out as a result. Luckily I was driving slow in a residential area. A professional wheel alignment at a shop specializing in Porsches solved the problem.

ttAmerica RoadsterAWD

Thanks. Now I'm thinking maybe I have RS alignment. Had her aligned at Ruf in Dallas when I lived in San Antone. I think that may be the issue.

Well, looks like i'm gonna need new wheels. One of my Gemballa wheels has a crack. On to wheel shopping now :-)

ca993twin

Jamie,

I was also surprised that I was down to cord on both rear inners when I took the wheels off. I use a very conservative alignment for street driving. So... all that moolah you saved on tires will go for wheels. Dang... its always something. Sorry... those Gemballa wheels look nice.

ttAmerica RoadsterAWD

Thanks, Steve. Now hunting down some Speedline Alliseo's.

IamSMC

No affiliation:
http://cgi.ebay.com/ebaymotors/Speed...item25568ba2fc

ttAmerica RoadsterAWD

Thanks, canysmc! I'm gonna see if those et's will look ok on my car.

pstoppani

How much negative camber are you running the rear? That's a major contributor to inside tire wear; very common on 911s, which all have a decent amount of rear camber stock.

ttAmerica RoadsterAWD

Hi pstoppani, I don't recall what Ruf set them at, but they are both wearing with similar pattern. Maybe i'll dial out less camber while in Cali....

911/Q45

Camber has very little effect on tire wear, bad kinematic toe will do it every time. Find a good Porsche qualified alignment guy.

ttAmerica RoadsterAWD

Kinematic toe. I thought this was adjustable on the 993 and newer cars? Am I wrong??

Jaime

911/Q45

It is adjustable, but takes a knowledgable guy with the right equipment to do it correctly. I went through a lot of tires before I found someone. They'll all say they can do it, but few can.

pstoppani

While I completely agree that incorrect toe will have a much greater effect on tire wear than too much camber, I respectfully disagree with the statement that "camber has very little effect on tire wear".

The two actually go hand in hand because our cars should have some toe in the rear which in combination with high negative camber will definitely cause the insides to wear more than if you have less camber. Also, you can run zero toe in the front and if you have -2 or more camber in the front, you will wear out the insides faster than the outsides.

Anyway, I think we all agree that a proper alignment is a GOOD thing

ttAmerica RoadsterAWD

Hmm. Makes sense. I don't have 993 rear suspension. I have 964T rear suspension..... so, I don't have kinematic toe?? right?

AOW162435

Correct. It's a 'feature' of the 993's LSA rear suspension.

I believe.


Andreas