Originally Posted by nc racer

Ok, I've seen the gear charts, I know how to calculate roll out, FDR and pinion/spur. my question is how do you determine what FDR to shoot for? Is there a given range you want to stay in? I know with these brushless motors, you have to pay very close attention to your gearing or youre going to be buying new ESC's and motors very quickly if you get something wrong.

Is there a good rule of thumb when decided how you are going to gear your car?