Okay thanks, i'll be off to the LHS tomorrow, I could try 13/54 and if thats running too hot, i'll convert it back to 2 speed. Will 22/54 fit on the RCM motor mount for a 9XL?
Now that I think about it, there would be no point to use a $12 5mm emaxx pinion for a Jato spur when I could also buy a $12 5mm mod1 pinion, then I could just use the stock Revo spur.