Discussion
Which of the following does not reduce unsprung mass?
Fitting a steel wheel in place of an alloy
Inboard brakes
Aluminium suspension arms
A lighter tyre
Answer: A
A steel wheel is heavier than an equivalent alloy, so fitting one increases unsprung mass rather than reducing it. The other three all move weight off the wheel or remove it entirely. Inboard brakes are the most dramatic reduction available. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.
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