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Which consequence does fitting very large wheels have?

  • A.Reduced unsprung mass, since the larger diameter allows a thinner and therefore lighter tyre to be fitted
  • B.Improved ride comfort
  • C.Better fuel economy, because the larger rolling radius reduces the number of revolutions required per kilometre
  • D.Increased unsprung mass and a harsher ride

Answer: D

A larger wheel with a low profile tyre is heavier and has less sidewall compliance, so both the unsprung mass and the effective spring rate at the contact patch increase and the ride deteriorates. Steering response improves, which is the trade being made. Fuel economy generally worsens through the additional mass and rolling resistance.

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