*rant mode on* Gearing a brushless motor has become insanely complicated due to the over-complicated timing adjustments on the ESC and motors. Blinky software and fixed motor timing is the only way that on-road will get out of the hole it is digging for itself *rant mode off*
Tell us what motor and esc you are using (as well as the software and motor timing settings) and we might, possibly be able to give you a gear ratio.
DP is the pitch of the gear (size of the teeth), naturally only gears of the same pitch will mesh together, so if you have a 48dp spur (likely, judging by the size), you need 48dp pinions to mesh with it.
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