Ok.. I have a tmiya dirt thrasher and i put a 19t cahmeleon in it with the stock 21tooth pinon. It doesnt seem to run as fast as my frog with the exact same motor and esc,radio, but i use the stock 18t pinon for the frog. And the frogs top speeds is fast and my dirt thrasher is slow.... whats ca i do to make the dirt tharasher faster? Thanks

gear it up a few more teeth.they are the same motor but the transmission ratio(gears)are different.pay attention to how hot the motor gets as you dont want it too hot.

i dont even know if a smaller pinion will fit.. i tryed a 18t,19t,16t pinon. But my frog with a 18t pinon that thing flys... takes off faster 0-15 than my .15 rustler.