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Depends on the brands, for one, and not everyone lists it.
MODIFY list their ratios as 21.6:1 for High Torque and 16.32:1 for High Speed.
But Prometheus has like Torque up, Double Torque, Triple Torque, etc. AFAIR, their Double Torque was something like 24:1 and Max Torque 36:1
Standard was something like 18:1
Maybe someone can dig up more accurate numbers.
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