Discussion
Which quantity does the overall gear ratio combine?
Answer: D
Overall ratio is the product of the gearbox and final drive ratios, and it determines the engine speed for a given road speed together with the rolling radius of the tyre. A change of final drive therefore affects every gear equally. Tyre size enters the road speed calculation but is not part of the ratio itself. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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