My 2003 G sedans tires are starting to cup. Dealer says it's the tires, tire guy says it's something in the suspension. Car has 90k miles, rides good, no pull and wear is even(except the cupping).
Ideas?

 

The majority of cupping happens in inexpensive low-quality tires. Higher quality tires are better able to resist chipping by the environment that causes cupping in cheaper tires. Even if the tires are higher quality, and cupping still occurs, the problem might be with an errant suspension on the vehicle. If the suspension on a vehicle allows for the tires to bounce, as the vehicle rolls along, the extra action will make scuff marks on the tires, resulting in cupping. Unfortunately, when the cause is the suspension, you do have replace the suspension and the tires.

If the tires experiencing cupping are on the rear only, the cause of the problem may just be with the vehicle's alignment. Fortunately, in such cases, purchasing new tires and an alignment is more cheaper han replacing suspension and tires.

Check your shocks to see if they're blown. What tires are you using? First thing to do is check your tire pressure too - start off with that since it's the easiest.

 

Tires are Americas Tire Arizona Silver edition. Not a big bucks wazoo tire, but not cheapie either. Socks seem ok and inflation is good.
Will try rotating this w/e.
The shocks look ok, are there bushings which hold the shocks which could be wearing down?
I've never seen springs wear out so quickly so I'm a little dubious about the springs being the cause.
Whatcha think?

 

Cups or scalloped dips appearing around the edge of the tread on one side or the other, almost always indicate worn (sometimes bent) suspension parts. Adjustment of wheel alignment alone will seldom cure the problem. Any worn component that connects the wheel to the car (ball joint, wheel bearing, shock absorber, springs, bushings, etc.) can cause this condition. Worn components should be replaced with new ones. The worn tire should be balanced and possibly moved to a different location on the car. Occasionally, wheels that are out of balance will wear like this, but wheel imbalance usually shows up as bald spots between the outside edges and center of the tread. Source: http://www.procarcare.com/includes/c...dtirewear.html

Get your suspension checked. Could be some bent components.

 

It can be caused by a combination of things such as alignment, worn suspension, or lack of rotation.