Speedometer gear for internal hub drive in front wheel on Nortons 1938 to 1945 with speedo drive on left hand side of front wheel. Plastic 3D printed PLA with correct hub thread and tooth ratio. This gear screws on to my 1936 hub and meshed correctly with the gear driving the speedo gearbox. Use this gear for testing purposes only to check your speedo drive is aligned correctly and functioning as the front wheel turns. Do not use at speed on a moving vehicle.Original part number:3879 - Gear ring for internal Hub drive
