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Which quantity is the overall gear ratio?

  • A.The final drive ratio alone, since the gearbox provides only the intermediate steps between rest and full speed
  • B.The sum of the two ratios
  • C.The gearbox ratio divided by the final drive ratio, which gives the reduction between the engine and the wheels
  • D.The gearbox ratio multiplied by the final drive ratio

Answer: D

Multiplying the two ratios gives the reduction between the engine and the wheels, which together with the rolling radius determines the road speed for a given engine speed. A change of final drive affects every gear equally. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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