stretch Posted June 25, 2016 Share Posted June 25, 2016 (edited) I have a few pinions knocking around and not sure of their pitch, I vaguely remember reading about counting the number of teeth then finding out the diameter, trouble is some places say measure the outside diameter while other say measure between teeth, i.e I have a 19t pinion outside diameter is 12.5mm making it 42p however the diameter between teeth is 11mm making it 48p so which is it? I used this calculator http://scriptasylum.com/rc_speed/gear_calc.html I have a mod 1 12t pinion with an outside diameter of 14.23 which sounds right? Edited June 25, 2016 by stretch Quote Link to comment Share on other sites More sharing options...
stretch Posted June 25, 2016 Author Share Posted June 25, 2016 ok found a stock firestorm 19t pinion with an outside diameter of 11mm which makes it 48p so looks like it's the outside diameter that needs to be measured. Quote Link to comment Share on other sites More sharing options...
Tug Posted June 25, 2016 Share Posted June 25, 2016 Yeah, the Firestorm and Blitz will definitely use 48dp. Quote Link to comment Share on other sites More sharing options...
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