Rear tire wear on s2000

[Jeff G 78]

Then how is it that the S2K guys can solve the problem by reducing the toe-in? I agree with your thinking, but the toe reduction fix works on that particular car.

[jmortensen]

Like I said, I'm just speaking from experience. I haven't experienced everything so I'm not saying that there isn't some weird circumstance that I just don't know about, but I have aligned hundreds of cars with lots of neg camber and lots of toe in (all Porsches with semi-trailing arm run pretty heavy toe in), and I've never ever seen that wear pattern. If you had enough neg camber to keep the outside of the tire off the ground, IME you'd also have heavy wear on the inside of the tire. These tires look nice and square to the road, and I'm presuming that the car isn't partially jacked up or something weird like that. If the tire is square to the road and the middle of the tire is completely bald, I don't see how neg camber can be a contributing factor. If the outside isn't worn off, and it isn't, then I can't see how lots of toe is a contributing factor.

We had a problem with our machine where we were getting a bad zero and I ended up aligning two cars and putting in over 1/2" toe in on the back. One was my Z. I ran about 1.75 degrees neg camber and probably over 1/2" toe in on it for about a week before the tires were COMPLETELY bald. All the way across. Not just in the middle. The other car was a customer's 928. Same thing. She didn't have nearly as much neg camber, probably under a degree, but the toe in was crazy, and she came in 2000 miles later with tires that were completely bald all the way across.

I'm not saying with absolute positivity that you're wrong. I'm saying I don't think you're right.

Edited July 21, 2011 by jmortensen

[240260280z]

Thanks all. I am with Jon: It is illogical. However I will try the 0 toe-in with -2degree camber on the new set and see what gives.

I did 7,000 miles since getting the car. First 2,000 from Nov-May mostly city with some highway the 5,000 miles in 2 last months: 4 X 16hour 1000 mile marathons and 2 X 500mi runs. I ran 30psi in the winter for traction then 28 for the last 3,000 miles after noting the start of centre wear.

btw everything is stock on the car. I'll get the new tires put on and an alignment done in a couple of weeks and report back to the thread.

Edited July 21, 2011 by Blue

[Jeff G 78]

Good luck Blue.