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gear ratio
noun[ C ]
engineering specializeduk /ˈɡɪə ˌreɪ.ʃi.əʊ/ us /ˈɡɪr ˌreɪ.ʃoʊ//ˈɡɪr ˌreɪ.ʃi.oʊ/
the relationship between the speed at which one gear(= a device that controls how much power goes to the moving parts of a machine) turns and the speed at which another gear that is connected to it turns:
The most common modification that riders make to their bikes is to adjust the gear ratio.
If you are carrying a heavy pack, you may want to alter your bike's gear ratio.
The spool is extremely light and has a sensible gear ratio of 4 to 1.
Lower gear ratios are most suitable when the motor is only capable of low speeds.
In smaller gear ratios, it takes fewer turns of the driving gear for the driven gear to make one complete revolution.
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The engine & engine parts
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