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Which effect does a stiffer front anti-roll bar have on handling?

  • A.No effect
  • B.It reduces the roll angle only, without altering the balance between the front and the rear of the vehicle at all
  • C.It increases understeer
  • D.It increases oversteer, which follows from the additional load that the bar transfers onto the rear tyres in a corner

Answer: C

Stiffening one end transfers more lateral load across that axle, which reduces its total grip and pushes the balance away from it. A stiffer front bar therefore adds understeer. It is the standard tuning tool for adjusting balance. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The order in which the effects act is what decides the outcome, so it is worth establishing first. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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