Wheel Centering Question

[Guest]

I pulled a rear wheel from a specialized p2 and placed on specialized stumpjumper M4. This wheel has 9 cog cassette. The wheel was not centered -- it sits closer to non drive side. So to better center the wheel I swapped the nuts that secure position of inner nuts (those which hold bearings in place). The ones I swapped are the nuts that rest against inside of dropout (they have the etched lines in them). I did this because one was clearly larger than the other.
This improves the center of the wheel but it is still not centered. I guess I could shop for an even thinner nut (to go on drive side) but it can't be too thin as the cassette can't come into contact with the frame.
Is this a common problem? Anything else I should try to better center this wheel?
Thanks -joel

[Alex Ramon]

Your hub/cone nuts/spacers should be equally centered... adjusting these to center the wheel is not a good idea. Wheels should be centered by dishing the wheel (adjusting the spokes and re-truing until the wheel is centered). Try watching the following video (at about 2:50):
http://bikeride.com/wheel-truing/