Originally Posted by LóFarkas
Of course, you can't go freewheel with this setup, ever, which is the only down side to it that I can think of. Oh well.
Instead of using a front hub, get a singlespeed rear hub with splines for one cog on one side and the disc mount on the other. Yay, fixed/free! I have the one from Nashbar. If you don't file off the cog splines entirely you can use the drilled cog on the freewheel side, too.