Originally Posted by Aeroplane
Okay. The Monocog 29'er is new this year, and has standard 135mm MTB spacing, same as the new '06 monocog. The older monocogs had 110mm rear spacing, and came with disc hubs starting around '03 or '04 I believe. They all came with V-brakes though.
The atomlab Disk Adapters that thread onto the freewheel threading will work for braking, and you can still have to bolt on a fixed cog to the stock disc-mount. You can use the stock wheel, flip it, bolt on your adapter+disc on one side, and bolt on a cog, and have a fixed, disc-brake equipped 29'er MTB very easily. Even less hassle than you planned on.
I already have a 135mm Surly fixed/free on the way and I'll just build my wheel with that. Not sure if I'm gonna run a disc brake on the fixed setup as I have a Nashbar ss hub that is disc ready. What can I say, I like building wheels.
I don't know if we've established what spacing the OP has, I was just throwing my .02 in. You've always been pretty helpful with the 110mm spacing or disc-to-fixed solutions. The atomlabs adapters (their spelling) just blew my mind in how someone comes up with an elegant solution to a problem.