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Definition I found
"Pitch - Could refer to the angle of the motor in the chassis, but most commonly referrs to the amount and size of teeth on a gear. Most cars come out of the box with 48 pitch gears, and most high speed slot cars use 64 pitch gears. In modern times, there has been some success using 72 pitch gears. The smaller the gear, the higher the pitch."
So I guess 48P defines the size of the pinion we need overall including diameter?
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