yep, i just looked on redcats site to figure it out.
look up parts for the epx and under pinion you will find 3 different sizes, all with 48 metric pitch.

would kinda be nice if some day all rc's ran the same pitch. there are so many!
32 and 48 standard are common.
so is 1.0 mod. some redcats have a .8 mod.
then there is whatever my F1 pan car has(unsure of the pitch but its very small teeth)