Why Do We Balance Wheels? – Understanding Road Force

Why Do We Balance Wheels? – Understanding Road Force


(relaxing music) – [Narrator] Why do we balance wheels? We balance to cancel out
the uncomfortable vibration that can be felt when an unbalanced wheel is traveling at speed, but
balance is not the only cause of wheel and tire-induced vibration. A vehicle may have four
perfectly balanced wheels and still experience vibration. Vibration can also be
caused by a bent rim. How the tire fits on the rim. Or by construction
characteristics of the tire. These factors contribute to road force, which is the change in force acting on a wheel assembly as it rolls. Fortunately, road force is easy to correct if you can measure it. Road force balancers
emulate driving conditions by pressing a roller against the tire. The roller measures the
road force for an assembly, and the balancer suggests corrections to minimize or eliminate
the road force vibrations. The most common corrective actions are, match mounting, the process
of rotating the tire on the rim to reduce
road force. Bead massage, a technique of exercising the new tire to better fit the rim. Or placing higher road force assemblies
in less sensitive wheel positions on the vehicle, like the rear. Balancing is always required
to eliminate vibrations, but eliminating all wheel
and tire-induced vibration requires measuring and
correcting road force as well.

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