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Old 11-07-2008, 01:05 AM
  #10  
chris_dono
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Join Date: Feb 2007
Posts: 596
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Originally Posted by jmcvicker
I read a note from someone who said "take brushed turns and halve them to get a similar performance brushless motor turn number".

So, that seems to work.

27T brushed -> 13.5 brushless
19T brushed -> 10.5 brushless
13T brushed -> 6.5 brushless
10T brushed -> 4.5 brushless

something like that. Brushless motors are not all the same - so the formula isn't exact - but works for a ballpark. Also note that brushless gearing is "way higher" than brushed in some cases. So, adding a few teeth on the pinion is typical when moving from brushed to brushless in the same "class".

That's a good "rule of thumb" but in reality, your list could be offset by one


27T brushed -> 17.5 brushless
19T brushed -> 13.5 brushless
13T brushed -> 10.5 brushless
10T brushed -> 6.5 brushless
7T brushed -> 3.5 brushless

going from 27t brushed to 13.5 brushless was a huge leap in gearing for me at my local track. I went from 8.2 down to 5.1
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