if its 5.5 that equiv to a 7 8 turn if im right you need a bigger spur 81 if you get to fit i would look about a 15 81 combo i run 18 78 with a nine and thats on the limit of the motor not the batteries they come off with loads 2300 mah after a race but the motors on the verge of cooking
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who knows who cares 
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