Abstract: A balancer for a wheel rim/tire assembly, including a rotation sensor assembly for measuring rotation, and a motor operatively connected for rotating the wheel rim/tire assembly. A control circuit controls the motor to actively hold the wheel rim/tire assembly at a desired rotational position. A rim measuring apparatus is configured to scan the inner surface of the wheel rim/tire assembly. The optimum plane locations, amounts of correction weights, and the number of correction weights, are calculated by the control circuit to result in a minimized residual static and dynamic imbalance. The control circuit utilizes the motor drive to automatically index and hold the wheel rim/tire assembly at the proper rotational position for placement of an imbalance correction weight, and a laser pointer illuminates the surface of the wheel rim/tire assembly at the axial position of the weight imbalance correction plane at which the imbalance correction weight is to be applied.