Originally Posted by
JoshuaRC10
If FDR remains the same after swapping pinion/spur, I would anticipate the motor position not changing.
FDR is related to total tooth count, and whether you're running 50/100, 100/50, or 75/75, you still have the same number of teeth and the motor position should remain the same. Additionally, there is no performance difference between one pinion/spur combo and another if the FDR remains the same.
What? No. FDR (final drive ratio) is the ratio, not total number of teeth. Large spur with small pinion gives a very different ratio to small spur with large pinion, even if the total tooth count is the same.