Provide the option of being able to change your gear ratio for different track conditions
Durable metal construction for long-lasting performance
The pinion gear shaft diameter or bore is 3.175mm, make sure your RC motor shaft have the same diameter
48P is the pitch of each tooth on the pinion gear and the 24T 25T 26T 27T 28T is the number of teeth on the pinion gear. You have to make sure your spur gear and pinion gear have the same pitch, or the teeth won't mesh
Comes with set screws for each pinion gear, the pinion gear combo set also included a screwdriver, easy to install