This is the spur gear (or main gear) for the Traxxas Nitro Rustler trucks.                                                                                      Includes: One 70 tooth gear                                                                                                                                     Features: Tough nylon construction                                                             Drilled for light weight                                                                                                                              Specs: Teeth-70                                                                            Pitch-32                                                                                                                                                 Requires: Nothing, this is a direct replacement part.                                                                                                           Comments: This is the same gear that comes in the truck kit.