Was the hub clean when you put the rotors on? I would think that if there were to be dirt or rust on a part of the hub, then the rotors won't have an even surface to mount on and could be mounted ever so slightly crooked.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record