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Which point is the roll centre of a suspension?

  • A.The centre of the axle
  • B.The point at which the suspension links intersect the centre line, measured at the height of the wheel centres
  • C.The point about which the sprung mass rolls
  • D.The centre of gravity of the vehicle, about which the whole of the mass rotates during a cornering manoeuvre

Answer: C

The roll centre is found geometrically from the instantaneous centres of the linkages, and the distance between it and the centre of gravity determines the rolling moment. Raising it reduces roll but increases jacking. It is not fixed and moves as the suspension deflects. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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