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Which component contributes most to unsprung mass?

  • A.The engine
  • B.The anti-roll bar, which connects the two sides of the suspension and moves with them as the wheels rise and fall
  • C.The wheel tyre and brake assembly
  • D.The body shell, whose weight is transmitted to the road through the springs at each corner of the vehicle

Answer: C

The wheel, tyre, hub, bearing and brake move entirely with the road surface and constitute the bulk of the unsprung mass. Suspension arms count as half sprung and half unsprung by convention. This is why inboard brakes were used on some designs and why large heavy wheels harm ride quality despite their appearance.

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