19T or 12 Double hmmmmm.
12 Double: 23/24 tooth pinion would seem a good place to start.
19T: I really have no idea in the D4. The below advice is purely based on TC running but should hold true.
A lot depends on the make of motor.
Orion: Look for an overall ratio of about 7.00:1
Anywhere from 6.8:1 to 7.8:1 depending on how revvy ot torquey the motor is...
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