well personally I go by asking people who race the same turn motor. Then I look at novak's brushless gearing recommendations as a starting point. And from there usually end up 1fdr lower than what they recommend. Fdr's are also a very personal thing. Some people like higher fdrs, some lower. Lately Ive been using higher fdr's with some timing advance speedies.
and by way I and most people would have a chuckle about using a 5.5 in a 2wd. The best drivers in the world dont use 5.5's in 2 wheel.
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