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Which quantity is the scrub radius?

  • A.The distance from the wheel centre to the road surface, measured with the vehicle standing at its kerb weight
  • B.The distance between the steering axis and the tyre centre at the road
  • C.The radius through which the tyre scrubs when the vehicle is manoeuvred at very low speed on full steering lock
  • D.The castor trail

Answer: B

Scrub radius is the offset between the point where the steering axis meets the road and the centre of the contact patch, and it determines how road and braking forces feed back into the steering. Negative scrub radius gives stability under a braking imbalance. It is a key design parameter. The shared behaviour explains why these belong together and the differences explain why both exist. Naming what changes and what stays the same is the reliable route through questions of this shape.

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