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Which mass is described as unsprung?

  • A.The whole of the vehicle measured at the kerb weight, since every part of it is ultimately carried by the road wheels
  • B.The wheels, hubs and the parts of the suspension below the spring
  • C.The body and everything carried upon it, which is supported by the springs and therefore moves with the vehicle
  • D.The engine

Answer: B

Unsprung mass is everything not carried on the springs, and it must be accelerated by every bump in the road. Low unsprung mass improves both ride and grip. Independent suspension and inboard brakes both reduce it. Checking which component actually carries the load settles most questions of this kind at once. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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