Could also be the narrower rear track trying to follow the front tires in ruts on the highway.

Older Ford and Chevy 4x4 trucks are notorious for this, as the front end was wider than the rear.

Adding wider wheels simply compounded the problem. 10mm OTG spacers would help out quite a bit.

 

huh?

the rear of the XA , as are most cars, is narrower than the front. I believe it's supposed to be that way.

I have 1/4" wheel spacers (to clear the suspension)on the rear & it still wanders on irregular pavement. It's the responsive tires. That's why it doesn't do it with stockers.

 

i concur. wider front track is FOR stability

 

I actually have the 10mm OTG spacers...was necessary, as the aftermarket wheels had a dollar-bill space between the back lip & the trailing arm.

I cancelled the sway bar & shocks because they kept pushing the date on the backorder. I'm ok with it for now & will probably revisit it when Monroe gets the shocks to market.

 

Stability in turns, perhaps. Not necessarily straight-line stability when combined with a highway that's been rutted from heavy truck traffic.

The same idea can be applied in the snow... if both tracks are the same, the car will track straight and true with no issues. If the rear is narrower than the front, the rear tires are going to try to follow in line with the tracks created from the front tires. If you have both rear tires fighting to follow in-line with the front, you'll experience shimmying.

 

yes but that does not apply unless the road is heavily rutted..

 

See the second sentence of my post.

 

I just got the Kumho's at a 195 with 15''. I wobble at speeds over 65 mph, it scares me a bit. Is this just the tire gripping harder? Should I replace the Kumho's and go back to the stock potenza's or good year. I am TRYING to avoid $500 for new tires AGAIN.

Thanks,

 

this is on ANY freeway I have driven on, rutted or not, my psi is at 29 but it seems to demonstrate in this thread that increasing psi does not help

 

Wobble...

You mean a shimmy (car going left and right) or a vibration?

I run Kumhos on my winter wheels with no issues. Could be that whoever mounted them failed to balance them correctly.

 

it feels like a shimmy and very responsive to if the road leans left or right.

Do you have 195 size?

I have had them re-balanced 4 times

 

Yup, 195/60R15.

Sounds more like a possible alignment issue if it's a shimmy.

How many miles on the car?

 

65,000 see this happened after they put on the tires. They said that cannot mess up my alignment.