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Originally Posted by reaxion
ir youre doing 60 and you hit the brakes and its shaking, rotors may be the case.
if youre driving and the shaking varies with speed, then the tires may not be balanced or worn unevenly.
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okay...I'm gonna help you guys out.
You're right sort-of. Steering wheel shimmy while braking IS the rotors...not maybe. Warped rotors WILL NOT cause a vibration while you're not braking!!!!!!!!!!!!!!!!!!!
As far as shimmy at various speeds, wheel balance is usually the culprit. The only other major cause of wheel shimmy is front end damage caused by accidents or major curb rash.
When it comes to tires wearing unevenly you have two things to thank for that. Bad alignment (usually 90% of the time) and poor driving habits (screech braking, hard cornering, poor tire inflation).
NOTE: poor tire wear will not cause a wheel shimmy!!! Tire wear cause vertical (up-and-down) motion not lateral (side-to-side) motion. Lateral vibration is what will give you steering wheel shimmy. Another big cause of lateral motion is a bent rim!!!
The best and always first method for fixing shimmy is getting the wheel balance checked. And on 240s with stock rims (steelies or alloys) have them do a "lug-centric balance" with standard weights. NO STICKY WEIGHTS!!! tires aren't wide enough to allow for an accurate balance.
Oh and check your wheel lugs.....torque to 75 ft lbs.
Class dismissed.