Abstract: To address the mismatch between the outer calibration plane of the rim and the tire target plane, and the insufficient accuracy of single-trial-weight calibration under different trial-weight mass conditions in tire dynamic balancing with multi-level rims, an equivalent calibration method for multi-level rim target planes was investigated. Based on the rigid-rotor dual-plane dynamic balancing principle, a forward equivalent transformation model from the outer rim calibration plane to the tire target plane was established. Standard trial weights of 10 g, 50 g, and 100 g were used to construct an overdetermined complex least-squares system, through which the equivalent calibration coefficients were identified. The calibration performance was evaluated by zero-position verification under multiple trial-weight conditions and was compared with that of the conventional single-trial-weight calibration method. The experimental results indicate that, within the trial-weight range of 10～100 g, the maximum relative mass error on the trial-weight loading plane was 3.30%, and the maximum phase angle error was 4.3°.The proposed method achieved higher overall accuracy than the conventional single-trial-weight calibration method, indicating that it can improve zero-position verification accuracy under different trial-weight mass conditions. The method can provide a reference for rapid changeover calibration of multi-level rims.