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Fellow RC enthusiasts,
I am running the stock 18t pinion in my Frog. The manual says that you can use a 16t or a 19t pinion as well. However the motor mounts are not adjustable. How does this work? How do you get the correct gear mesh?

Thanks for enlightening me,
Cheers,
MetalMaxx

Apologies! It's earlier in the manual. You have to change the spur gear together with the pinion. 
Solved!

Team crp made a frp adjustable motor support for the srb. I have one on my blackfoot.