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Which effect does steering axis inclination produce?

  • A.The vehicle rises as the wheels are turned from straight ahead
  • B.The wheel leans outward at the top as it is turned, which increases the contact patch during a cornering manoeuvre
  • C.No effect
  • D.A reduction in the effort required to turn the steering wheel, because the axis passes closer to the contact patch

Answer: A

Because the axis is inclined, turning the wheel lifts the vehicle slightly, and the weight then tends to return the steering to the straight ahead. It also reduces the scrub radius. Both effects improve the steering feel and the stability. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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