Drive set without motor and controller for the electromechanics Ord.No. 1002/80 and 1002/82 with a 1600 mm rotor diameter For 12S LiPos with approx. 5800mAh Total gear ratio for mechanics and drive set: 1st stage (Ord.No. 870/60:128/25): 60:24 = 2.5 2nd stage (Ord.No. 830/90:830/18): 90:18 = 5 Total gear ratio: 2.5 * 5 = 12.5