Differentials can also provide a gear ratio between the input and output shafts (called the "axle ratio" or "diff ratio"). For example, many differentials in motor vehicles provide a gearing reduction by having fewer teeth on the pinion than the ring gear.

History

Milestones in the design or use of differentials include:
* 100 BC-70 BC: The Antikythera mechanism has been dated to this period. It was discovered

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