Steering Ratio – Suspension KPI

Steering ratio is a ratio of the degrees of steering wheel angle input and degrees of road wheel toe angle change.

Steering ratio is a function of rack ratio (mm of rack travel per steering wheel revolution) and suspension geometry.

RACE reports the suspension geometry portion of the steering ratio.  The metric is given as degrees of toe angle change per mm of rack travel.  A typical plot is shown below.

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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