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Which of the following is not a wheel alignment angle?

Scrub radius

Camber

Castor

Toe

  • A.Castor
  • B.Toe
  • C.Scrub radius
  • D.Camber

Answer: C

Scrub radius is a distance, being the offset between the steering axis and the tyre centre measured at the road surface. Camber, castor and toe are all angles. The distinction matters because scrub radius is a design parameter rather than a service setting. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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