Front End Shimmy
- Tire out of balance.
- Tire and/or wheel out of round.
- Excessive wheel runout.
- Insufficient or improper caster.
- Worn suspension or steering system components.
- Defective shock absorbers.
- Wheel bearings worn or loose.
- Power steering reaction bracket loose.
- Tire stiffness variation.
- Steering gear rack or box mounting loose.
- Steering gear adjustment loose.
- Worn spherical joints (front wheel drive).