Join Date: Nov 2004
Bikes: Track bike, road fixed, cross fixed, two single speed mountain.
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I've done a fair amount of mountain fixed riding. I'd really say to stay away from suicide setups on the trail. The lower gear and thus higher torque of mountain riding really stresses the cog/hub connection, and has even greater potential than on the road for popping off a bb lockring. If you're starting from scratch, go for a bolt on cog with a disc hub. Solid connection, will never unthread or simply break the threads from side pressure.
The bolt on cog is what you'll ultimately want for mountain fixed riding, so might as well go for it now. It will be nominally more expensive at the moment, and way cheaper than buying it later and replacing a cheap wheel.
That said, I've also had good luck with Surly hubs/cogs for offroad riding. Just buy quality stuff and you'll be fine.