wheel balance is out.if it jerks alot at high speeds possibly a tire seperation.if those two possibilities check out then check the toe angle of the front suspension.
well... there are many different causes for vibrations. The most common cause for steering wheel vibration at high speed is poor wheel alignment.
== == Bad Tire or Tires.
Tire out of balance, bent wheel, drive shaft bent, loose or worn steering parts.
Either your drums or rotors are out of round.
You probably need to get your tires balanced. Or replaced. If the bias goes (steel belt breaks or shifts), the car will waddle at low speeds, and the steering wheel will shake at high speeds.
have front suspension checked
Mine did it because of a horrible alignment
You rotors are warped and will need replaced/resurfaced.
Could be out of balance Tire may be worn and need replacement Could be a bent wheel
Vibration of the tire is caused by a uniformity parameter called "variation of radial force". Usually a vehicle's steering wheel will vibrate (called torsional nimble) at a certain speed. This vibration is caused by the harmonics of this radial force. Picture the side view of a tire with different size springs within it. The force of these springs cause a distortion of this force and you feel this distortion in the steering wheel.
go get 2 new tires and have the alignment checked on it
This is usually a symptom of excessive run-out (warped) on front brake rotor or rotors.