Try getting the rear wheels balanced, out of balance rear wheels can cause a steering shake that you would swear was the front wheels.
As well as the vibrations you're feeling through your seat.
General rule of thumb is that if the steering wheel is vibrating, it's the front wheels out of balance, & if you can feel the vibration through the car, it's the rear wheels out of balance. Goes without saying if you've got both steering wheel and car vibrations, then get all 4 tyres balanced.
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I've had new tyres fitted and balanced, gone down the road, and experienced vibration. Gone back, they strip the weights off, and rebalanced with different weights in completely different places. Maybe I should have gone for the 'precision' balance. Suspect the second balance was done by someone with more precision, rather than some fancy precision machine.
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>> Try getting the rear wheels balanced, out of balance rear wheels >> can cause a steering shake that you would swear was the >> front wheels. As well as the vibrations you're feeling through your seat. General rule of thumb is that if the steering wheel is vibrating, it's the front wheels out of balance, & if you can feel the vibration through the car, it's the rear wheels out of balance. Goes without saying if you've got both steering wheel and car vibrations, then get all 4 tyres balanced.
I repeat, out of balance rear wheels can cause a steering shake that you would swear was the front wheels.
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Front- or rear-wheel drive? Prop shaft and its joints can cause vibrations too.
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It's also worth adding that cold or slightly flat spotted (through standing still over time) tyres often vibrate more at speed. I used to leave work, and within a mile be cruising at 70MPH on a dual carriageway. Each of the three cars I drove during this employment would shimmy the steering wheel for the next few miles before normal good balance returned.
If, however, I had been out and about, popped in to the office for a few minutes, and then returned to the dual carriageway still with warm tyres, no shimmy would ensue.
There have been countless other times, cars, and locations where I have also noticed this behaviour.
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Could even be out of round tyres.Ie tread not in line all the way round tyre?.Has been a few around lately. Will give same effect except balancing wont cure.
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Steve
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I'd check the rears carefully. You don't say how old the car is but some fwd cars driven light load barely wear rear treads. Instead the casings fail.
Rear tyre life on our BX was around five years then you'd get vibration like out of balance only there'd be a dirty great bulge in the tread of one/both rears.
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