When
a wheel is unbalanced, there is an unequal distribution of weight
around the rim of the wheel and tire assembly. The tire may seem round
and true when rotated slowly, but on the road centrifugal force acts on
the heaviest part of the tire, making it wobble or vibrate (like an
out-of-balance ceiling fan). This can cause flat spots on the tire
treads and is damaging to ball joints, bearings, steering, and shock
absorbers. With special equipment, technicians can measure a tire and
wheel assembly, then add special wheel weights to restore balance.
Hitting potholes and normal vehicle wear-and-tear can cause unbalanced
wheels. Uneven tire wear can indicate unbalanced wheels, so it's wise
to check and rotate your vehicle's tires regularly.
