Rear wheel real deal

 Yup, that's a Moto Guzzi rear shaft drive wheel with drum brake, so why convert over to sprocket for a '47 Knuckle? If  I have to answer that question, you just don't get why we do the things we do. First off the hubcap and cutting a 4" hole for the outside sprocket spacer to hold via a machined flange on the underside. Next, the inner spacer that holds hub to splined drive hub. And finally the sprocket spacer which will accept a custom 50 tooth 7075 Aluminum sprocket made to order.