Thanks for the reply, are the crossfire hubs 66.5 or 66.6? My thought is to put 66.6 id to 73.1 od hub centric rings with no spacer up front to keep them centered. Then in the rear I believe I can get hubcentric spacers with a 66.6 id and 66.6 od that I can again use the 66.6 to 73.1 hub ring on...seem correct?