Correct answer
The number of revolutions the crankshaft makes in one minute.
On a motorcycle's instrument panel you can find various measuring instruments such as the speedometer, the odometer or the rev counter. As for this last one, its function is to indicate the number of revolutions the engine's crankshaft makes in one minute.
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The total number of kilometres travelled.
The speed at which you are travelling.
The number of revolutions the crankshaft makes in one minute.
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