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Sounds like a wheel out of balance,tire low on air, tire belt shifted (starting to go), loose wheel, bad wheel bearing. press the helpful button and check links below Diagnosing And Repairing Wheel Vibration
Sometimes this is related to tread ply separation. the key is the frequency or rate of the vibration. Why it steadies at faster speed is anyone's guess. To test you jack up a corner of the car, spin the wheel and observe across the tread while tire is spinning.
Another way to test is to have the tires balanced and have those guys check for trueness.
If you find this condition, there is no cure but new tires.
great danger there. dont go fast.
can be tires out of balance (tire weighs feel off)
or wheel falling off (ever check the lugs)
tire bad. (bulged, delaminations , man killer tires, like Firestones)
tire rods balls, ready to fall off (more man killers)
ball joint ,ready to fail. and far far worse...
why not get the car serviced, have them check it out before.... bad happens.
noise and vibration or shaking on any machine means , doom is coming. in most cases,.
If it only does it when you are using the brakes, I would check the brakes on both sides. If it does it without using the brakes, I would look for a bad tire on the front. One of the tires could have a broken belt inside the tread. Could also be a bad wheel bearing on the front.
If the steering wheel starts to shake between 55-65 MPH then you need to balance the wheels. If it shakes when you press the brakes, your brake rotors are warped and need to be cut or replaced. If the steering wheel shakes at low speeds then it's possible one of your rims is bent or one of your tires is out of round. Leaving a car parked for a long time in snowy and icy roads will damage your tires, causing them to warp. Depending on which situation is causing your steering wheel to shake, have it looked at.
there are a few things that are more likely than others .. first tire balance .. if a tire loses a balancing weight or gets its rim dented or if the tire is simply worn .. then you need to rebalance the wheels .. this should be done every year or so anyhow .. a broken cord or belt in a tire will also show up when they try to balance as will a bent rim .. this will tend to shake the car above 50 mph .. thats also not a safe condition since the tire could fail unexpectedly .. you might observe a tires tread wiggling when observed moving from another car or on a rack when you spin the tire .... tires are most likely the trouble but a worn out CV joint will also shake at certain speeds .. usually this shows up at low speeds or as excessive slack in the drive system .. warped rotors are a frequent source of vibration . but usually the problem is most noticable as brakes are applied .. the best bet is to have the tires balanced and inspected .. that will give you lots of information .. one more thing you dont see as much anymore is wheel vibration at higher speeds caused by worn ball joints or tie rod ends .. the wheels will actually oscillate above a critical speed . you will often see cupping on the front tire treads if this happens .. that cupping problem can also be observed when the tires are balanced .. the tie rod ends can be checked with the wheel off the ground .. shake the tire left to right .. excessive slack would mean worn tie rod ends ...
If you get a bad vibration in your steering wheel at low speeds without braking it is either a bad tire or a bad rim. If you get a vibration at speeds around 45-50+ and goes away you probably have a balance issue. If the vibration only occurs while braking then your rotors are warped. If low speeds it shakes i'd take it to a shop to check your tires.
if you hit the brakes and it shakes its your rotors, they're probably warped. Having them turned (polished) won't fix it. You'll have to replace them. As for the shaking at over 50, if you're not touching the brakes, you'll probably just need to have your tires balanced. Maybe jack up you car an check the ball joints and tie rod ends (keep the tire on and see if there is play, either up and down (ball joints) and left and right (tie rods)). Hope this helps.