Originally they claimed that the brushless number represented half the number equal to a brushed motor. So a 13.5 was supposed to be the same as a 27t.. but as we found out early on, a 13.5 was much much faster. A 6.5 motor, one of the most popular for offroad in my opinion is more like a 9t brushed than a 13t. Another way they rate them by KV value.. this number multiplied by the number of volts applied is the RPM the motor will yeild.


Jerome