I have a "front" hub (although I use it on the rear, as my transpo is a home-built scooter, not a bicycle) and I have the same problem with the "dish" of the wheel. It can only go so far to one side because the spokes on that side are perfectly vertical. The spokes need to have some angle (between the hub an the rim) in order for them to "pull" the rim to that side--thus, centering the rim.