Vibrating Steering Wheel on 2003 Ford Explorer

Currently, I have a "shimmy" in my steering wheel. What may be causing this?

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2 answers
If the shimmy is at highway speed when going a steady say 55-65 mph, it is usually a wheel balance problem. If the shimmy happens when braking, especially from higher speeds, it is usually caused by warped rotors. When does the shimmy occur?
Likely need your front wheels balanced if tires are good. Always run best tread on the front and have them balanced and rotated at every other oil change.