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

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: Popped a belt in the transmission

The transmission does not have belts. It does have internal metal bands. These bands hold clutch drums to get the different gears to engage. If the band breaks, the transmission will feel like it went into neutral or park. Transmission...

Q: abs light on brake line broke have been replace I bleed brake line but brake pad still go to the floor now wheels lock up

Hello. If the brake pedal is going to the floor then that means that it is not building pressure. If the brake system has been fully bled and there is no air in it then most of the time it...

Q: Camber bolt stuck in struck to hub connecting bracket

If you referring to the camber adjustment, that adjusting bolt goes through the strut and the steering knuckle and is held on to the steering knuckle by a nut. If the nut has been removed from the adjusting bolt, you...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...