The car is not with me. Perhaps I can explain a little better. The greatest diameter of the hub, the flat disc area the the lugs go through has a diameter of 5 11/16", and the recess in the back side of the rotor that is machined is smaller than the the hub that slides into it. I want to be sure the hub is correct so I can approach the rotor vendor. I can't see how the rotor could be wrong. There was only one SBP disc setup.
