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Recently it is becoming more necessary than ever to carry out performance prediction and factor analysis at the initial design by-computer aided engineering (CAE), in order to ensure the high performance, safety and reliability of motorcycles and also to shorten the lead time of product development. Finite element method (FEM) plays a crucial role in this respect. In particular, since the vibration characteristic is one of the most important evaluation items, the demand for accurate vibration prediction at the initial design has become much more intense. In recent years, vibration simulation methods have achieved remarkable progress, and especially the substructural synthesis method (SSM), combined with FEM, is used as an effective tool for the requirements.