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Which weakness does the MacPherson strut have?

  • A.The wheel loses camber as the body rolls
  • B.A high unsprung mass, which follows from the damper being carried within the wheel rather than upon the body
  • C.Poor durability
  • D.An inability to accept a driven wheel, which is why it is confined to the rear suspension of most modern vehicles

Answer: A

The wheel stays roughly perpendicular to the body, so it leans with the body in a corner and the outer tyre loses camber exactly when it is most loaded. A double wishbone can be arranged to gain camber instead. Struts are used on driven wheels universally. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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