This is also true for a set of rims that do not have a proper centric ring for your hub and just float on the lugs as well.

Always make sure the spacers you use are specific for your car make and model and fit the hub VERY snugly and have a duplicate of the center of your stock hub for the wheel to attach to. As said above, this will take the load off the studs and put it back on the main wheel/hub combination where it belongs.