2004 GP rear alignment

I can't see or measure the tire lean, but the GM specs are negative .87 degrees +/- .50 degrees, so it's quite possible that the tires will appear to be leaning in at the top. These cars run a lot of negative camber both front and rear.

Ian

Thanks....looking at the rear wheels, it seemed kind of drastic that I can see about an inch difference in the camber, but the guy that did the alignment said that was normal.

If your tires are about 24" high and they lean 1", then take the inverse tangent of 1/24 = 2.39 degrees lean.

b wrote:

And that means exactly what?

b wrote:

In the same thread shiden_kai said the specs are negative .87 degrees +/- .50 degrees. Neg 2.39 degrees is quite a bit more than the above. That means there is still something wrong.

(P.S. I don't normally top reply but it seems to go better with this thread.) Paul.

Gale wrote:

All right. I measured the difference from vertical and it was about 5/8", instead of 1" that I eyeballed. Since the tire bulges out slightly at the bottom, I took off 1/8", which makes it about 1/2" over 24". Taking the arctan of .5/24 gives me about 1.2 degrees which is in spec and also about what the readout from the alignment shop says. It's just amazing to me that it is so apparent when looking at the rear tires. I would rather have them closer to 0 degrees, unless there is some handling reason why they shouldn't be. Obviously, from the specs, 0 degrees is out of spec, so there has to be some negative camber.

Thanks for the input.

-Bill

(P.S. I don't normally top reply but it seems to go better with this thread.) Paul.

Gale wrote:

When cornering, the sideways force pushes inward on the bottom of the outside wheels. I bet that during cornering the alignment is close to zero or slightly positive.