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Which benefit follows from reducing unsprung mass?

  • A.Reduced fuel consumption only
  • B.A lower centre of gravity, which improves the handling of the vehicle by reducing the transfer of load in a corner
  • C.The wheel follows the road surface more closely
  • D.A softer ride, which follows from the reduction of the total weight that the springs are required to support

Answer: C

A light wheel assembly is accelerated more easily by the road, so it follows the surface instead of leaving it, which maintains grip. The body is disturbed less at the same time. It is the reason alloy wheels and aluminium suspension arms are used. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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