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Road force balance. It is the matching of the tire to rim. Your rim is not perfectly round and the sidewall stiffness is not uniform around the diameter of your tire. The road force balance matches the high spots on the rim to the soft spots on your sidewall. It is in my opinion the best thing since sliced bread. Needless to say it is only as good as the operator, usually a teenager.
Once the wheel and tire are matched than a traditional style balance is done on the assembly.
Also inflate your tires to 18-22 psi, these cars only weigh 2500 lbs, if you inflate to 32 psi you will wear the center of your tire out.
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