Road Force Balancers
A computer in the machine, along with various sensors, determines variations of tire stiffness, radial runout and anything in the tire’s construction (such as inconsistencies in the belt package) that would prevent the tire from rolling smoothly when it is weighted by the car. By measuring both the wheel and tire, the road force balancer tells the technician where to move the tire around on the wheel until the effective high spot of the tire (when it is rolling on the car) matches the low spot of the wheel – a more sophisticated method of match mounting.
It’s actually more complicated than that, but for practical purposes, that is what a road force balancer does. If necessary, in extreme cases, the road force balancer can be used to run several tires across different wheels to find the best possible wheel and tire combinations.
Use of a road force balancer can provide consumers with the same level of ride comfort previously only available to OEMs.