Traxxas 3785 Titan 12 Turn 550 Motor 550 motor size, 3mm output shaft Virtually maintenance-free operation and long-lasting performance Integrated cooling fan pulls cool air through the motor to keep temperatures down Cooler running motors allow faster speeds, longer runtime, and extended motor life Titan 12T motors are intended for use in single motor and single battery pack applications up to 8.4 volts The Titan 12T 550 550 size motor, 3mm output shaft Integrated Cooling Fan