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Directional stability is an important parameter in high speed as well as in low speed maneuvering. A three - wheeled vehicle has a tendency to pull one side resulting in poor directional stability. This pulling requires continuous steering correction for improving directional stability. Driver needs to apply more force on handle bar to stabilize the vehicle. This causes the driver to experience shoulder pain and inferior maneuverability. A vehicle one side pull problem is directly related to safety and comfort. Also, during riding external disturbances from road generate lateral forces in tyre leading to sudden path deviation of vehicle. This path deviation deteriorates handling and it becomes difficult for the rider to control it to its original position. The aim of this work is to understand the influence of various parameters on three wheeled vehicle directional stability.