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?

A: Replace the tires. It used to be possible t...

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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Belt rattling

If you are hearing a rattling sound from the belt area, it is likely coming from one of your pulleys or your belt tensioner. I would recommend having your engine and belt area inspected and listened to by a mechanic...

Q: Something is wrong with the passenger's side wheel.

Sounds to me like a loose suspension/steering part or maybe a failed wheel bearing, sometimes a wheel that has come out of balance or a defective tire can cause vibrations or other symptoms that would mimic suspension/steering problems. A certified...

Q: Uneven tread wear on rear tires with slightly negative camber

It depends on how fast they wear out. If it's unsafe and wobbles around, fix it correctly and get a camber kit. But, if you find that the tires will last 10,000 to 20,000 miles, buy some cheap tires and...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...