3961 Spur gear 68-tooth (0.8 metric pitch, compatible with 32-pitch) TRX39613961 Spur gear 68-tooth (0.8 metric pitch, compatible with 32-pitch) TRX3961Traxxas 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.Replacement part for these models:Summit
