Try our free RC Gear Recommender App to get an AI-powered recommendation! Just enter your motor and a few other details, and we'll recommend a pinion to start with for your track conditions.
What is the transmission ratio (internal ratio) of the TRF421?
The TRF421 transmission ratio is 1.85. For help calculating your gear ratio, Final Drive Ratio (FDR), or rollout, try our Gear Calculator Pro App.
How many teeth does the stock spur gear for the TRF421 have?
116 teeth.
Where can I get parts for the TRF421?
Try our partner AMain Hobbies. They carry many of the latest cars and trucks.
Try our partner Redcat Racing. They should have what you need!