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Which term describes the weight carried by the suspension springs?

  • A.Sprung mass
  • B.Unsprung mass, which comprises the wheels, tyres, brakes and the outboard portion of the suspension components
  • C.Gross vehicle weight
  • D.Kerb weight, which is the mass of the vehicle with all of its fluids but without any passengers or payload

Answer: A

Sprung mass is everything supported by the springs, principally the body, engine, occupants and payload, while unsprung mass is everything below the springs and moving with the wheel. The ratio between them governs ride quality, because a large unsprung mass follows road irregularities poorly and transmits more disturbance into the body. Reducing unsprung mass is therefore one of the most effective ways of improving both ride and roadholding, which is why aluminium and composite components are used there despite their cost.

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