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A vehicle's steering wheel sits thirty degrees off centre although the vehicle travels straight and the tyres wear evenly.

Which explanation is most likely?

  • A.The tyres are of different sizes, which alters the rolling radius and therefore the direction the vehicle travels
  • B.The toe was set by adjusting one track rod only
  • C.The castor is unequal between the two sides, which would produce a pull as well as displacing the steering wheel
  • D.A wheel bearing is worn

Answer: B

Adjusting one rod turns both wheels together, so the total toe is correct and the tyres wear normally while the wheel sits off centre. Unequal castor would produce a pull. A thrust angle error is the other candidate and is checked next. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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