Traxxas 3955 Spur gear, 40-tooth ( 1.0 metric pitch)

40-tooth spur gear (1.0 metric pitch). Traxxas spur gears let you fine-tune the performance of your Traxxas model. Changing gear ratios can help balance acceleration and top speed for different running conditions. Please consult your owner’s manual for more information on recommended gearing options for your specific model.