One of these days I would like to build myself a fixed gear bike and I have been watching track hubs of all kinds. It doesn't seem to matter what kind (Campy Record, Dura Ace, or Superbe Pro) they all seem to command huge prices on ebay. I have also watched BMX hubs. They seem to get good prices too but not nearly as much. Has any body heard of road fixed gear bikes being built with BMX hubs? Are the spacings the same as track hubs?