What is bump steer?

Bump steer refers to the phenomenon where the vehicle's wheel alignment changes due to suspension travel, leading to unintended steering input. This typically occurs during compression or extension of the suspension, which can cause the steering angles to shift unexpectedly. As the suspension moves, particularly over bumps or uneven surfaces, the tie rods and control arms can move in such a way that they alter the direction in which the wheels point. This unintended change in steering can make it difficult for the driver to maintain control of the vehicle, as the vehicle might veer off course unexpectedly.

Understanding bump steer is essential for properly tuning suspensions in performance vehicles, where maintaining consistent steering response is critical for handling and driver confidence. Drivers may feel jerks or see deviations from their intended path when hitting bumps or potholes if bump steer is present, which can be especially problematic in racing or spirited driving conditions. Adjusting suspension geometry—such as aligning the tie rods and control arms properly—can help mitigate bump steer and enhance vehicle handling.