The  - steering is a rack and pinion steering

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As opposed to conventional steering systems, the PSS steering has differently-shaped racks and pinions and has low-friction straight gearing. All other components and construction principles correspond to those of a conventional rack and pinion steering system.

This type of rack and pinion enables the mathematically most ideal form of progression for a steering system with the highest efficiency

 Conventional steering rack                               - steering rack   

Function of the  -steering