The benefits of Jim's hub adapter and sprocket go on and on. You'll probably hear a lot of them as responses.
Working on jets, I'm sure you'll appreciate the quality and fit of his hubs and sprockets and the universality of being able to slide the hub to properly space the chain between the frame and tire. It's a great design. Those two bolts on the hub and three bolts on the sprocket are WAY easier to work with than those nine threaded devils that come with the rag-joint inspired kit ogres. It's a simplistic design that works for what it is but, Jim's works GREAT.