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Climax F509 Skew Ring Gear (41 Teeth) mounted on F510 Climax Gear Hub. Each can be printed separately, but a request was made to mount the Gear on the Hub. Will require boring the Gear Hub to mount on an axle. Drilling is not an option. The gear has been printed and according to the user "meshes perfectly" with the F217 Skew Pinion Gear. Note: The real ring gear was 31 37/64" Diameter and was used on 35" and 36" wheels. A drawing illustrating the Gear set is here: https://s3.amazonaws.com/SIMONTON/F509-F217+Gear+Setup.pdf