It may quite possibly be the tires. At low speed there will not be a noticeable sound, but at higher speeds the contact of the tires' tread with the pavement will sometimes amplify what was once a barely detectable sound into the high pitched tone that you are hearing. Other possibilities could be at the brake calipers. The wear indicators on your rear disc brakes (if you have them) could be in contact with the rotor thus causing the sound. The only other possibility that I can think of is the wheel bearings. If I were you I would first check the tires though. If you purchased new tires this could very well be the cause.
thumping sound coming from front wheels when you let go of the gas pedal going at a moderate spped?
Could be a wheel bearing or scalloped tires but you will have to pin-point the source before you can fix it.
zoe
There is no similarity. Loudness has to do with sound pressure amplitude coming from the sound source. Pitch has to do with the frequency of the tone the sound source is making. Loudness cannot be pitch.
its coming from the front end from the wheels we thought it was the wheel bearing
A loud clicking sound coming from the front of your car when you are driving straight would be the result of a bad CV joint. This is something that should be checked out right away.
Out of balance gives more of a feeling than a sound. Any sounds from wheels rotating are usually from the wheel bearings.
One of your wheel bearings are bad
Your clutch throw-out bearing may need replaced.
A whinig or howling sound coming from a cars wheels means that a wheel bearing is bad and should be replaced.
When a hub bearing is broken it will create a rattling sound as the wheels spin. The after a car accelerates the louder the hub bearings will sound.
sound is wavelengths, and wavelengths get compressed when coming to you (and stretched when going away). the closer the wavelengths, the higher the pitch!