Abstract: A motorcycle hub adapter for shaft driven motorcycles that permits a user to mount any custom wheel to a shaft driven motorcycle assembly. The adapter includes a housing that has a substantially hemispherical shape with a convex side with an opposite relatively flat opposite side. The adapter includes a central through opening extending from a round flattened end on the convex side with cooperative dimensions to receive the axle therethrough. Several peripheral annular surfaces are provided with holes to mount the brake disk rotor assembly at the farthest possible distance form the rim while other components of the motorcycle are also mounted to make them compatible with the rim assembly.