40T Revo spur gear in new style Emaxx, what pinions reach?

[Cain]

Hi,

Looking to put a Revo mod1 40T spur gear in a newer style emaxx, but I am not sure what pinions will reach ( using a Neu 1512 2.5D/F Motor).

What is the smallest pinion that anyone has used that will reach.

Or, if this won't work and I need a bigger gear, are there other options out there for a larger spur that will work on a stock newer style emaxx? (I read MGT, but can't see the pic someone posted).

If you know what the lowest pinion that will reach for the 40T revo spur, as well as the MGT spurs that can be made to work please post.