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Which modification commonly introduces bump steer?

  • A.Lowering the vehicle without correcting the steering geometry
  • B.Fitting wider tyres, which alter the scrub radius and therefore change the way the wheel responds to road forces
  • C.Fitting stiffer springs
  • D.Fitting a quicker steering rack, which increases the rate at which the toe changes as the steering is turned

Answer: A

Lowering moves the suspension arms and the track rod off their designed relationship, so their arcs no longer match and the toe varies with travel. Correction requires bump steer spacers or relocated mounting points. It is the classic consequence of a careless ride height change. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming what changes and what stays the same is the reliable route through questions of this shape.

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