Originally Posted by TejanoTrackie

OK, in all fairness to the naysayers, there are some cases when the hub flange is too close to the end of the treads on a fixed hub, such that a freewheel body will hit the outboard spokes. There was a case reported in a previous thread of this problem with a Dura Ace low flange track hub and a flip/flop fixed/fixed track wheel I recently puchased is like this. Hubs like the Harris/Formula are designed with sufficient clearance that a freewheel will work safely and properly.