Originally Posted by Vixtor
Bolt-on cogs are the only way you could have a free hub and a fixed side but you will have to sacrifice your disc.
Never say never... or in this case "only".
2010 Marin Hamilton 29'r came with a flip-flop hub. Fixed one side, SS freehub
I snapped a pic when one came into the shop a few months back, but it's on my phone and I don't seem to have the technlogical where with all to convert to a image I can upload here.
You can check the specs on the bike though, and see that it's listed that way... but no model. Just says "Flip Flop, Freehub and Fixed Gear, Alloy Double Sealed, 32 Hole"
Anyways... what you seek does exist somewhere.... just have to figure out how to get one I suppose.
Marin seems to have spec'd a 2 speed hub for 2011 on the Hamilton, so maybe the previous flip-flop has disappeared to the world of cycling myth.