Dynamic Wheel Balance

"Dynamic" balance is the equal distribution of weight on each side of the vertical centerline of the wheel and tire assembly. If unbalance lies on either or both sides of a plane of rotation, it is dynamic unbalance. This causes the wheels to bounce, resulting in flat spots on the tire tread and worn ball joints, tie rod ends, steering gears, and shock absorbers. Dynamic unbalance in the front wheels will cause them to wobble as well. Bouncing could also set up a heavy vibration the chassis and affect the steering balance.