Bump / Roll Steer – Suspension KPI

Bump steer is a measure of the suspension toe angle change with suspension vertical travel.  Bump steer, given in Deg/m, is a measure of the toe angle change in degrees versus suspension travel in metres.  Roll steer is calculated in the same way as bump steer except the wheel travel is generated by applying a roll angle to the vehicle body.

A typical front suspension bump steer curve is shown below from RACE.  The on-centre bump steer is -2.5 Deg/m.  The curve also has excellent linearity for wheel travel between 50mm rebound and 50mm bump.

This KPI page is only a brief overview. To learn more about this and other KPIs, including KPI values used in industry, real-world examples and best-practice guidance, please refer to our courses below.

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