Skip the auto shop - Our mechanics make house calls

Q: Intermittent vibrations due to two out-of-round tires

asked by on

There have recently been intermittent vibrations while driving my car. An independent tire shop inspected it and said that one front tire and one rear tire were out-of-round due to tread separation or belt slipping. I suspected this was related to the vibrations I noticed soon after purchasing it used. Two years ago it had Continental dws tires installed, from a Volvo dealer. At the time I assumed it was an imbalance or poor wheel mounting. The dealer inspected it and found uneven camber wear and cupping. He told me there was no tread separation and my car’s suspension checked out, as did the alignment. The intermittent vibration can not be explained by the camber wear and cupping since they are permanent. The independent shop had said that the tire has an internal defect that is allowing shifting in the belts. I truly feel that these tires have a dangerous manufacturing defect. What can I do to get rid of the vibrations?

Replace the tires. It used to be possible to "true up" a tire that was out-of-round by putting the wheel/tire on a special machine that literally ground rubber off of the "high" side of the tire, making it physically round. Volvo delivered these cars from the factory with excessive negative camber settings on the rear suspension that caused the cupping you mention. There is a Volvo Service Bulletins provided to dealers to address this issue: Uneven Rear Tire Wear, Correction of Excessive Negative Camber in Retailer Technical Journal RTJ15309-2009-12-16. The RTJ calls for the replacement of the rear upper control arms with part number 31201356 which reduces the camber by ~ 0.7 deg. It is applicable to 2007-2010 C30 models. I believe the replacement only applies to cars under warranty, but the same control arms should be available for installation, then re-alignment. This should get rid of future cupping of rear tires.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Intermittent vibrations due to two out-of-round tires

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Front right driver side wheel came off

Hi there. It sounds like your ball joint broke which allowed the suspension to move allowing the axle to pop out. This can cause some damage to the transmission, but most of the time it is as simple as a...

Q: Hi terry, I have a 2015 Dodge Challenger and i bought it 2 months ago with 9K miles. I now have 14K as i drive alot. My LR tire ha

A mechanic cannot determine ANYTHING about how the clutch has been used, or the failure mode of any part of the clutch mechanism, based on the condition, wear pattern, or anything of the sort relative to the vehicle's tires. There...

Q: Are the two ignition modules interchangeable?

The two modules should have a part number clearly indicated on the top, if they are the same, then the modules are interchangeable. If there is a suffix A or B or something like that at the end, there may...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...