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when they are no longer balanced.
Yes, you should have balanced all 4 tires.
Tires are out of balance. Have the tires balanced.
very
Yes
If the tires are properly balanced plug tires should not cause a vibration.
If they are already balanced then no you dont. but if they are not balanced yes you do. If you dont you will wear out the tires faster than if they were balanced.
All tires should be balance checked before being placed on a vehicle. If the tires are not balanced it will cause uneven wear and they will not last as long as they should.
Usually you won't hear much more noise from a tire if it's not balanced, but you will feel a vibration when you get up to highway speeds. If you take it up to 60 or 70 mph and feel a vibration, you probably need to get them balanced.
If your car's tires are out of balance it will usually cause a vibration or thumping. If your wheel alignment is out it will usually cause the car to pull to one side.
Normally this is caused by one or more of the tires out of balance. If the steering wheel is shaking then you know it is a front tire. Have all your tires rotated and balanced.
Could be several reasons but the first one that comes to my mind is to have the tires balanced.