[BrianG]

I don't know. I understand Mike's post about the wear factor, but look at the inout gear of a Revo transmission; it has far fewer teeth than the first or secong gear and it wears just fine. The last time I took my Revo tranny apart, that small gear still looked pristine without a hint of wear. I really think a perfect gear mesh matters a lot. Of course, by the time the power reaches the transmission, it has already been reduced in rpms by the spur/pinion...