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This is a 0.4 Pinion Gear (48T, 49T)
Proper gear ratio should be determined by the available output power of the motor, type of battery, track condition and layout.
*Using pinion gear larger than 41 teeth with TB01 chassis ma result in damage to the motor.
Optional spur gear can be used with TA04 chassis.
50873 TA04 Spur Gear Set (04 Module; 112T, 120T, 128T)