[E-Revonut]

A 15-17t pinion is about right for that setup, depends on what voltage your running. I run a 17tbon anything from 4 cell nimh to 2s lipo. 15t doesn't put enough load on the motor with lipo power. Of course this is all on an old style rc18t, I don't know how it will work in the new setup with a shortcourse setup