to make a long story short i was running my x1 w/MM 2200 ,14/62,4s zippys and after6 weeks of flawless running it dropped 1 cell on 3 of 4 of the zippys and then it fried the ESC. Castel sent me a new 2200 and a remanned ESC so i think the motor failed witch took down the zippys and then i used my reedys on the (unknown to me) failing motor and in turn fried the esc insted of the battery. So i got it back and i decided to change all the gearing to the X2CRT.Im runnig a shimmed plastic AE 48 th spur and the X2 spiral cut diff gears with the same electronics as before "less the zippys" anyone have a suggestion on what pinnion to run. thanks