Gearing Question

[wade7575]

I'm getting a 3905 E-MAXX.Then I'm getting a Nue motor and MMM what I'm wondering is if I leave the E-MAXX 100% stock.I will change the A-ARMS and shocktowers to rpm stuff.I've seen the gearing conversion charts but I do not get them at all.I'm going to be running a Nue 1515Y motor and will be running 16.8 volts,I know what everyones going to say no don't do it get Lipos I'd love to but my check book won't go for it.I know enough about gearing if you guys say run a pinion between 14 an 20 tooth that I need to start with the smallest and going up in size 1 tooth at a time while watching the motor and ESC temps.