The standard spur is 87T and to use a 25T pinion you would need a lower kv motor in the range of 8.5 - 10.5 otherwise it will be way overgeared I use a 18/19 on a 5.5 indoors and go up to a max of a 21 when outdoors. When using a 6.5 I usually run between 20 and 23 pinion. There is a FDR gear ratio chart in the 410 manual which can be downloaded from the Durango website.
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