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Vibration at 20 mph

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Old Dec 21, 2009 | 09:43 AM
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I have an unusual vibration at 20 mph....the vibration goes away around 15 mph and 30 mph...very odd.

I have re-balanced my tires, checked my rotors, checked my tires etc....none of those seem to cause the problem.

Has anyone experienced this before? I had my control arms replaced about 5,000 miles ago. I wonder if it is a strut?

The vibration is coming from the front of the car.
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Old Dec 21, 2009 | 04:56 PM
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Originally Posted by mag75' post='1077686' date='Dec 21 2009, 01:43 PM
I have an unusual vibration at 20 mph....the vibration goes away around 15 mph and 30 mph...very odd.

I have re-balanced my tires, checked my rotors, checked my tires etc....none of those seem to cause the problem.

Has anyone experienced this before? I had my control arms replaced about 5,000 miles ago. I wonder if it is a strut?

The vibration is coming from the front of the car.
Bent wheel? Worn Front end parts? If your rotors are within spec, tires balanced (on a road force balancer), no broken belts in tires, then those may be the last two possible suspects. A strut would not cause a vibration at certain speeds, it would cause a hard ride and/or clunking noise.
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Old Dec 21, 2009 | 06:20 PM
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I agree with the bent wheel. Something similar happened to my old E36 and it all went away after I replaced all 4 wheels. G/L
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Old Dec 21, 2009 | 06:29 PM
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Switch your tire to the other side and see if the vibration follows. I agree, it's a bent wheel.
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Old Dec 22, 2009 | 04:33 AM
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My '06 had a noise coming from the front right similar to a flat spot on a tire. Slight ticking feel in the steering wheel noticable in street driving at those speeds but disappeared at highway speed. Turned out to be the right front wheel bearing. Changed at 65k miles problem solved. Good luck!
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Old Dec 22, 2009 | 05:17 AM
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Thanks for all the replies.

As for the bent wheel, when they balanced the tires, would they be able to tell if the wheel was bent?
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Old Dec 22, 2009 | 05:19 AM
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Originally Posted by 530inOK' post='1078146' date='Dec 22 2009, 09:33 AM
My '06 had a noise coming from the front right similar to a flat spot on a tire. Slight ticking feel in the steering wheel noticable in street driving at those speeds but disappeared at highway speed. Turned out to be the right front wheel bearing. Changed at 65k miles problem solved. Good luck!
Thanks.....I am hoping my wheels are bent. Any idea what the cost was for the wheel bearing?
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Old Dec 22, 2009 | 07:07 AM
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Originally Posted by mag75' post='1078163' date='Dec 22 2009, 04:19 PM
Thanks.....I am hoping my wheels are bent. Any idea what the cost was for the wheel bearing?
According to RealOEM the wheel hub with bearing, front, would be 282.30$. Before going to dealer because of wheel bearing, you should check it yourself to see if it's broken. That's pretty easy to do.

- Antti -
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Old Dec 22, 2009 | 09:02 AM
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Originally Posted by mag75' post='1078162' date='Dec 22 2009, 10:17 AM
Thanks for all the replies.

As for the bent wheel, when they balanced the tires, would they be able to tell if the wheel was bent?
The best advisors can spot a bent wheel. Most balancers, however, are not trained, and many bent wheels do not result in a road force warning. The road force machine is told to "fix" the problem without realizing that the problem is deeper than a good fix.
It does not make sense to me that a bent wheel would produce vibration only at under 30mph. The key speed for vibration for a bent wheel (18" or 19") is around 30-35mph and 68-70mph.
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Old Dec 22, 2009 | 09:13 AM
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Originally Posted by monacobmw' post='1078314' date='Dec 22 2009, 02:02 PM
The best advisors can spot a bent wheel. Most balancers, however, are not trained, and many bent wheels do not result in a road force warning. The road force machine is told to "fix" the problem without realizing that the problem is deeper than a good fix.
It does not make sense to me that a bent wheel would produce vibration only at under 30mph. The key speed for vibration for a bent wheel (18" or 19") is around 30-35mph and 68-70mph.
Those were my thoughts exactly. Guess I will need to take it in regardless.
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