The gear used is a standard B4/XXX internal idler gear, which are both 48dp.
You could also use CAT SX gears as these are 48dp too and would allow for various different sizes to suit your requirements.
I'm pretty sure the B4 & XXX idlers are a slightly different number of teeth, so you could use these to give different ratio's. You have to bare in mind that the distance between the motor securing screw and the motor output shaft is a fixed distance, so pinions/ratios are limited.
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