tramlining and tire pressures

[motordavid]

Maybe it's just me, but I have seldom noticed tramlining on our X, in 8 yrs or,
the Vette in 7+ years; both driven hard on the usual various & suspect road conditions.
And, the few times either car did so, was inconsequential. Our pos CR-V
tramlines more than the other cars, combined.
GL,mD

[X5Dawg]

I never had this issue when I had the factory 17's on my 3.0, but since I have changed to the 20's I feel this quite a bit.

[TowX]

It's more than just alignment, or tire size, or tire construction, or even tire wear patterns. It's a combination of so much of these factors.

On my X5, the 19" Michelins tram, but my 18" snows only slightly tram. On my 528, I had little tramming until I put some negative camber in the front for better handling, but the problem goes away when I mount up my 15" snows. My 911 trams like crazy but it's got stiff R-compound tires and -2.5 degrees camber up front and -3.0 in the back. And an old Vette I had never trammed with fresh tires, but as they wore down, usually unevenly, it would follow every pavement imperfection.

[c4racer]

Originally Posted by TowX

Correct, camber and caster aren't adjustable in the front. The H&R concentric bolt replaces the upper of the two large bolts that attach the spindle to the strut, and is concentric so as you turn it, you change the camber.

Cool. I will get a pair of those puppies and dial things back just a tad.

[c4racer]

Originally Posted by TowX

It's more than just alignment, or tire size, or tire construction, or even tire wear patterns. It's a combination of so much of these factors.

On my X5, the 19" Michelins tram, but my 18" snows only slightly tram. On my 528, I had little tramming until I put some negative camber in the front for better handling, but the problem goes away when I mount up my 15" snows. My 911 trams like crazy but it's got stiff R-compound tires and -2.5 degrees camber up front and -3.0 in the back. And an old Vette I had never trammed with fresh tires, but as they wore down, usually unevenly, it would follow every pavement imperfection.

Agreed. And it is also highly road dependant. I hardly noticed it at all in 1200 miles of highway driving from CO to CA when I picked up my X. But this one stretch of 880 in the South Bay is pretty bad. It doesn't bother me that much, but I also would not mind pulling back some neg camber to reduce the tendancy slightly, even at the cost of giving up a slight bit of handling.